US20170031103A1 - Optical Receiver With Reduced Cavity Size and Methods of Making and Using the Same - Google Patents
Optical Receiver With Reduced Cavity Size and Methods of Making and Using the Same Download PDFInfo
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- US20170031103A1 US20170031103A1 US14/939,747 US201514939747A US2017031103A1 US 20170031103 A1 US20170031103 A1 US 20170031103A1 US 201514939747 A US201514939747 A US 201514939747A US 2017031103 A1 US2017031103 A1 US 2017031103A1
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000013307 optical fiber Substances 0.000 claims description 9
- 230000005693 optoelectronics Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/428—Electrical aspects containing printed circuit boards [PCB]
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12002—Three-dimensional structures
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12004—Combinations of two or more optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
- G02B6/12009—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
- G02B6/12019—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides characterised by the optical interconnection to or from the AWG devices, e.g. integration or coupling with lasers or photodiodes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention generally relates to optical signal reception, and optionally, optical signal transmission. More specifically, embodiments of the present invention pertain to methods and apparatuses for receiving an optical signal using a light-processing cavity having a reduced size.
- FIG. 1 shows a portion of a conventional optical transceiver 100 having a housing 180 .
- the optical transceiver 100 comprises a light-carrying medium 130 (e.g., an optical fiber) which transmits a received optical signal towards a beam splitter 140 . At least a portion of the optical signal is reflected by beam splitter 140 towards a ball lens 150 . The reflected portion of the light passes through the lens 150 and is received by a light-receiving unit 110 (e.g., a photodiode).
- the lens 150 is positioned in a lens cap 155 .
- the housing 180 encompasses a light processing cavity in the optical transceiver 100 .
- the transceiver 100 further comprises a transmitter 120 and an optical fiber 130 surrounded by a sheath 135 .
- the light-receiving unit 110 must be located in a portion of optical transceiver 100 that is orthogonal to and extends away from the transceiver 120 and sheath 135 .
- FIG. 2 shows a conventional optical transceiver 200 with a conventional package, including a receiver portion 210 , a transmitter portion 220 , an optical fiber 235 , an optical fiber connection housing 240 , and a transceiver housing 280 which encompasses the conventional optical transceiver portion 100 of FIG. 1 , including the light processing cavity.
- Each of the receiver portion 210 and the transmitter portion 220 are fitted with four pins, a power supply pin 212 or 222 , a ground pin 214 or 224 , a data pin 216 or 226 , and a complementary data pin (not shown, but generally behind the data pin 216 or 226 ).
- the width and thickness dimensions of transceiver housing 280 have a significant impact on the profile of optical transceiver 200 .
- a dimension L 1 of optical transceiver 100 and/or housing 180 may be relatively large, compared to the optical fiber connection housing 280 and transceiver 220 ( FIG. 2 ). Relatively large cross-sectional dimensions may be required for the housing 180 to house or encompass the components of optical transceiver 100 , based upon their arrangement in FIG. 1 .
- optical and optoelectronic network equipment industries seek ever-smaller transceiver packages and/or consumption of less space by functional components in the transceiver.
- Smaller packages enable more form-fitting network components, and smaller space consumption enables more functionality to be included within the same size package.
- the present invention is directed to an optical device that can reduce the space consumed by optical signal processing components, thereby reducing the size of optical and optoelectronic devices such as optical and optoelectronic transceivers.
- Embodiments of the present invention relate to an optical device, methods for making the optical device, and a method of processing an optical signal (for example, using the device).
- the optical device generally comprises a light-transmitting medium configured to transmit a first light beam; a light-receiving unit configured to receive and process a focused, reflected light beam; a first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; a lens configured to focus the reflected light beam; and a second mirror configured to reflect the focused, reflected light beam towards the light-receiving unit.
- the optical device may further comprise (i) a third mirror configured to reflect the reflected light beam towards the second mirror and/or (ii) a light-transmitting unit configured to transmit a second light beam through the first mirror or beam splitter.
- the second mirror may be positioned such that a first straight line between the second mirror and the light-receiving unit crosses a second straight line between the light-transmitting medium and the first mirror or beam splitter.
- the method of manufacturing the optical device generally comprises affixing a light-transmitting medium in a housing of the optical device or into an opening in the housing of the optical device, the light-transmitting medium being configured to transmit a first light beam; affixing or adhering a light-receiving unit to the housing, the light-receiving unit being configured to receive and process a focused, reflected light beam; affixing or securing a first mirror or beam splitter within the housing, the first mirror or beam splitter being configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; affixing or mounting a lens to or in the housing, the lens configured to focus the reflected light beam; and affixing a second mirror within the housing in a position configured to reflect the focused, reflected light beam towards the light-receiving unit.
- the method of manufacturing the optical device may further comprise (1) affixing a light-transmitting unit in the housing or into an opening in the housing, the light-transmitting unit being configured to transmit a second light beam through the first mirror or beam splitter, the second light beam (i) being received by the light-transmitting unit and (ii) having a wavelength different from that of the first light beam, and/or (2) filtering the reflected light beam.
- the light-receiving unit comprises a photodiode, and in one architecture and/or arrangement, the light-receiving unit may be positioned at a side of the light-transmitting medium opposite from the second mirror.
- the method of processing an optical signal generally comprises receiving a first light beam from a light-transmitting medium; reflecting at least a first portion of the light beam away from a light-receiving unit; passing the reflected light beam through a lens to focus the reflected light beam; reflecting the reflected light beam towards the light-receiving unit; and receiving the focused, reflected light beam in the light-receiving unit.
- the method of processing the optical signal may comprise reflecting the first portion of the light beam using a first mirror or beam splitter, and reflecting the reflected light beam towards the light-receiving unit using a second mirror.
- the sum of (i) an angle of incidence of the light beam upon the first mirror or beam splitter and (ii) an angle of incidence of the reflected light beam upon the second mirror is about 45°.
- the light-transmitting medium may comprise an optical fiber having an unsheathed end proximate to the light-receiving unit.
- the present invention advantageously provides an optical receiver or transceiver with a reduced cavity size, enabling smaller sized packages and/or more functionality to be included within a similar sized package.
- components of an optical device according to the present invention e.g., “folding” a light beam away from a light-receiving unit, in space that might otherwise be unused in the transceiver
- the present invention enables an optical device to have a smaller, more compact design.
- FIG. 1 is a diagram showing part of a conventional optical transceiver.
- FIG. 2 is a diagram showing an external housing for a conventional optical transceiver.
- FIG. 3A is a diagram showing an exemplary optical device according to the present invention.
- FIG. 3B is a diagram showing a use of the exemplary optical device of FIG. 3A according to aspects of the present invention.
- FIG. 4A is a diagram showing an alternative optical device in accordance with additional aspects of the present invention.
- FIG. 4B is a diagram showing a use of the alternative optical device of FIG. 4A .
- the present invention concerns an optical device, generally comprising a light-transmitting medium configured to transmit a first light beam; a light-receiving unit configured to receive and process a focused, reflected light beam; a first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; a lens configured to focus the reflected light beam; and a second mirror configured to reflect the focused, reflected light beam towards the light-receiving unit.
- a further aspect of the invention concerns a method of manufacturing an optical device, generally comprising the steps of affixing a light-transmitting medium in a housing of the optical device or into an opening in the housing of the optical device, the light-transmitting medium configured to transmit a first light beam; affixing or adhering a light-receiving unit to the housing, the light-receiving unit configured to receive and process a focused, reflected light beam; affixing or securing a first mirror or beam splitter within the housing, the first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; affixing or mounting a lens to or in the housing, the lens configured to focus the reflected light beam; and affixing a second mirror within the housing in a position configured to reflect the focused, reflected light beam towards the light-receiving unit.
- Even further aspects of the invention concern a method of processing an optical signal, generally comprising receiving a first light beam from a light-transmitting medium; reflecting at least a first portion of the light beam away from a light-receiving unit; passing the reflected light beam through a lens to focus the reflected light beam; reflecting the focused, reflected light beam towards the light-receiving unit; and receiving the focused, reflected light beam in the light-receiving unit.
- FIG. 3A shows an exemplary optical device 300 according to the present invention.
- Optical device 300 may be an optical transceiver or other device capable of receiving and processing an optical signal.
- Optical device 300 may comprise or be contained within a housing 380 .
- the housing 380 may have an opening through which a light-carrying or light-transmitting medium 335 is placed.
- the light-transmitting medium 335 may comprise an optical fiber which may be surrounded (or sheathed) by a ceramic material 330 . A portion of the optical fiber may be uncovered (or unsheathed) at an end closest to a light-receiving unit 310 .
- the light-carrying or light-transmitting medium 335 may be configured to carry or transmit a light beam or optical signal.
- the light beam or optical signal is a diffuse light beam or optical signal (e.g., slightly cone-shaped and/or having a characteristic enlargement or spreading of the beam size, width or diameter as a function of distance), but the invention is also applicable to other light beams or optical signals, such as polarized and/or collimated light beams or optical signals.
- more than one signal may be simultaneously carried or transmitted by the light-transmitting medium 335 , each signal having a different wavelength. For example, a first signal at a first wavelength or wavelength band may be received by optical device 300 , and a second signal at a second wavelength or wavelength band significantly different from the first wavelength or wavelength band may be transmitted by optical device 300 .
- the optical device 300 comprises a first beam splitter 340 configured to reflect at least a portion of the light beam emitted from light-transmitting medium 335 .
- First beam splitter 340 and light-transmitting medium 335 may be aligned such that the light beam transmitted by light-transmitting medium 335 is incident upon first beam splitter 340 .
- the angle of incidence of the transmitted light beam upon first beam splitter 340 may be about 45° (e.g., exactly 45°).
- the beam splitter 340 may be or comprise a mirror.
- First beam splitter 340 reflects at least a portion of the light beam away from the light-receiving unit 310 (see, e.g., FIG. 3B ).
- the reflected portion of the light beam may comprise light of a first wavelength.
- all light transmitted from the light-transmitting medium 335 to the first beam splitter 340 is reflected.
- First beam splitter 340 may also allow a second beam (or a second portion of the incident light beam) to pass through.
- the light which passes through first beam splitter 340 generally comprises light of a second wavelength, where the second wavelength is different from the first wavelength.
- the first and second wavelengths may differ by a minimum of about 100-200 nm, generally up to about 500-1000 nm.
- the first and second wavelengths may differ by at least about 5, 10, 15 or 20%, up to as much as 25, 50 or 100%.
- the first beam splitter 340 may comprise a dichroic mirror, a wavelength selective filter (made of or coated with a reflective material), a polarization component, an amplitude modulation mask, a phase modulation mask, a hologram, and/or a grating.
- the optical device 300 may further comprise a light-transmitting unit 320 which may be configured to transmit light that passes through first beam splitter 340 .
- Light-transmitting unit 320 and light-transmitting medium 335 may be aligned such that the light beam or optical signal transmitted by light-transmitting unit 320 enters or is incident upon the end of light-transmitting medium 335 .
- Light-transmitting unit 320 may be configured to transmit a second light beam or optical signal through first beam splitter 340 , the second light beam being received by the light-transmitting medium 335 .
- optical device 300 may be configured as a bi-directional (BIDI) optical device.
- a second portion of the light beam emitted the light-carrying medium 335 towards the first beam splitter 340 may pass through the first beam splitter 340 and be received by a second light-receiving unit (not shown).
- the portion of the light beam passing through the first beam splitter 340 should be focused by a second lens before being reflected by a mirror or beam splitter in a second light-processing unit (not shown) substantially similar to that shown in FIG. 3A .
- the optical device 300 may also comprise mirrors 345 and 360 (which may be referred to as, for example, intermediate mirror 345 and final mirror 360 ) configured to reflect light from first beam splitter 340 towards the light-receiving unit 310 .
- the angle of incidence of the reflected light beam upon intermediate mirror 345 may be about 45° (e.g., exactly 45°).
- Intermediate mirror 345 may be positioned at an angle of about 90° (e.g., exactly 90°) with respect to first beam splitter 340 .
- Final mirror 360 may be configured to reflect the light beam towards the light-receiving unit 310 .
- the light beam which is incident upon final mirror 360 may be the focused light beam which has passed through lens 350 .
- Final mirror 360 may be positioned at an angle of about 90° (e.g., exactly 90°) with respect to intermediate mirror 345 .
- Final mirror 360 may be positioned such that a light beam reflected from final mirror 360 is in a direct path toward light-receiving unit 310 .
- the optical device 300 may also comprise a lens 350 configured to focus the reflected light beam (see, e.g., FIG. 3B ).
- the lens 350 may focus the received and/or incident light that passes through the lens 350 , and is thus particularly advantageous when the received light beam 390 is a diffuse light beam.
- Lens 350 may be a half ball lens, which may comprise a curved surface facing intermediate mirror 345 and a flat surface facing final mirror 360 .
- the lens may comprise a concave lens, a convex lens, and/or or a combination of concave or convex lenses.
- Lens 350 can be placed anywhere in the light path (e.g., between first beam splitter 340 and intermediate mirror 345 , between final mirror 360 and light-receiving unit 310 , etc.), but doing so may affect the extent of the cavity size reduction and, when the light beam is diffuse, the diameter or width of the light beam at certain points in the device 300 (e.g., as it enters the receiver 310 ).
- the optical device 300 may also comprise a filter 370 between final mirror 360 and light-receiving unit 310 , configured to filter (e.g., reduce the wavelength band of) the light beam traveling between final mirror 360 and light-receiving unit 310 .
- Filter 370 may comprise material(s) known in the art that are capable of blocking certain predetermined wavelengths of light from passing through.
- the filter 370 can be placed elsewhere along the light path (see, e.g., FIG. 3B ).
- filter 370 may be placed between first beam splitter 340 and intermediate mirror 345 , between lens 350 and final mirror 360 , or attached to, affixed to or integrated within the lens 350 , etc.
- the optical device 300 may also comprise a light-receiving unit 310 .
- the light-receiving unit 310 may comprise (1) a photodiode (e.g., a PIN photodiode) or other light-detecting component(s) and (2) an amplifier (e.g., a transimpedence amplifier and/or a limiting amplifier).
- the light-receiving unit 310 may be positioned at a side of the light-transmitting medium 335 opposite from final mirror 360 .
- Light-receiving unit 310 may be configured to receive the light beam from final mirror 360 .
- the dimension L 2 of optical transceiver 300 and/or housing 380 may be relatively small, as compared to the dimension L 1 of FIG. 1 .
- a relatively small cross-sectional dimension enables the housing 380 to have a smaller profile, fit in a smaller package, and/or house or encompass additional components (and thus additional functionality) within optical device 300 .
- FIG. 3B shows a path that a light beam may take within the light processing cavity of optical device 300 of FIG. 3A .
- a light beam (or optical signal) 390 may be emitted from light-transmitting medium 335 , after which the light beam 390 is incident upon first beam splitter 340 , where it is reflected in whole or in part towards intermediate mirror 345 as reflected light beam 392 .
- Intermediate mirror 345 reflects the light beam 392 through lens 350 , which focuses the reflected light beam 394 .
- light beam 394 will have a smaller size, width or diameter than light beam 392 .
- the focused light beam 396 is incident upon final mirror 360 , which reflects the focused light beam 396 towards light-receiving unit 310 .
- the focused, reflected light beam 398 is received in or on the light-receiving unit 310 after passing through filter 370 .
- the components of optical device 300 may be arranged such that a first straight line between the final mirror 360 and the light-receiving unit 310 crosses a second straight line between the light-transmitting medium 335 and the first beam splitter 340 .
- the first and second straight lines may be perpendicular to each other (e.g., may cross each other at right angles).
- a third straight line between final mirror 360 and intermediate mirror 345 may be parallel to the second straight line between the light-transmitting medium 335 and the first beam splitter 340 .
- a fourth straight line between intermediate mirror 345 and first beam splitter 340 may be parallel to the first straight line between the final mirror 360 and the light-receiving unit 310 .
- the lens 350 may be in the path of the third straight line between final mirror 360 and intermediate mirror 345 .
- lens 350 may be in the path of the first straight line between final mirror 360 and receiver 310 (e.g., it may be mounted on receiver 310 ), or in the path of the fourth straight line between first beam splitter 340 and intermediate mirror 345 .
- final mirror 360 comprises a dichroic mirror, wavelength selective filter, polarization component, amplitude and/or phase modulation mask, hologram and/or grating
- intermediate mirror 345 may be on the second straight line, on a side of the final mirror 360 opposite from the light-receiving unit 310 .
- Light-transmitting unit 320 may be on the first straight line at a side of the first beam splitter 340 opposite from the light-transmitting medium 335 .
- FIG. 4A shows an alternative optical device (e.g., an optical transceiver) 400 in accordance with additional aspects of the present invention.
- Optical device 400 may comprise or be contained within a housing 480 .
- Optical device 400 may comprise a light-transmitting medium 435 having a sheath 430 , a light-receiving unit 410 , a first beam splitter 440 , a light-transmitting unit 420 , a lens 450 , a second mirror 460 , and a filter 470 in an arrangement similar to optical device 300 (see FIG. 3A ).
- optical device 400 includes only two mirrors (or a mirror and a beam splitter).
- first beam splitter 440 and light-transmitting medium 435 may be aligned such that the light beam transmitted by light-transmitting medium 435 is incident upon beam splitter 440 at an angle of about 13° (e.g., 13 ⁇ 0.5° [or any positive amount less than 0.5°], and in one embodiment, exactly 13°).
- Such an angle of incidence of the first beam splitter 440 may be advantageous in the case where the received light beam (e.g., light beam 490 in FIG. 4B ) is polarized and/or collimated, but the optical device 400 is also effective and advantageous when the received light beam is diffuse.
- Second mirror 460 and first beam splitter 440 may be aligned such that the light beam reflected by first beam splitter 440 is incident upon second mirror 460 at an angle of about 32° (e.g., 32 ⁇ 0.5° [or any positive amount less than 0.5°], and in the same embodiment, exactly 32°).
- a sum of (i) an angle of incidence of the light beam upon the first beam splitter 440 and (ii) an angle of incidence of the light beam upon the second mirror 450 may equal about 45° (e.g., 45 ⁇ 0.5° [or any positive amount less than 0.5°], and in the embodiment shown in FIG. 4A , exactly 45°).
- a dimension L 3 of optical transceiver 400 and/or housing 480 may be relatively small, compared to the dimension L 1 of FIG. 1 and the dimension L 2 of FIG. 3A .
- a relatively small cross-sectional dimension enables the housing 480 to have a smaller profile, fit in a smaller package, and/or house or encompass additional components within optical device 400 .
- FIG. 4B shows a path that a light beam may take in the optical device of FIG. 4A (i.e., optical device 400 ).
- a light beam (or optical signal) 490 may emanate from light-transmitting medium 435 , after which the light beam 490 is incident upon first beam splitter 440 , where it is reflected in whole or in part towards lens 450 as reflected light beam 492 .
- the focused light beam 496 is incident upon second mirror 460 , which reflects the light beam 496 towards light-receiving unit 410 , wherein the reflected, focused light beam 498 is received in or at the light-receiving unit 410 .
- the components of optical device 400 may be arranged such that a first straight line between the second mirror 460 and the light-receiving unit 410 crosses a second straight line between the light-transmitting medium 435 and the first beam splitter 440 .
- the first and second straight lines may be perpendicular to each other (e.g., may cross each other at right angles).
- a third straight line between second mirror 460 and first beam splitter 440 may be neither parallel nor perpendicular to either the first straight line or the second straight line, but may be normal or perpendicular to the surface of the lens 450 (e.g., the planar surface of half-ball lens 450 ).
- the lens 450 may be in the path of the third straight line between second mirror 460 and first beam splitter 440 .
- Second mirror 460 may be at an opposite side of the second straight line from the light receiving unit 410 .
- Light-transmitting unit 420 and first beam splitter 440 may be at an opposite side of the first straight line from the light-transmitting medium 435 .
- the present invention provides an optical device, methods for making the optical device, and a method of processing an optical signal (for example, processing the optical signal using the device).
Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 13/212,137 (Attorney Docket No. SP-065-U), filed Aug. 17, 2011, pending, incorporated by reference herein in its entirety.
- The present invention generally relates to optical signal reception, and optionally, optical signal transmission. More specifically, embodiments of the present invention pertain to methods and apparatuses for receiving an optical signal using a light-processing cavity having a reduced size.
-
FIG. 1 shows a portion of a conventionaloptical transceiver 100 having ahousing 180. Theoptical transceiver 100 comprises a light-carrying medium 130 (e.g., an optical fiber) which transmits a received optical signal towards abeam splitter 140. At least a portion of the optical signal is reflected bybeam splitter 140 towards aball lens 150. The reflected portion of the light passes through thelens 150 and is received by a light-receiving unit 110 (e.g., a photodiode). Thelens 150 is positioned in alens cap 155. Thus, thehousing 180 encompasses a light processing cavity in theoptical transceiver 100. - The
transceiver 100 further comprises a transmitter 120 and anoptical fiber 130 surrounded by asheath 135. The light-receivingunit 110 must be located in a portion ofoptical transceiver 100 that is orthogonal to and extends away from the transceiver 120 andsheath 135. -
FIG. 2 shows a conventionaloptical transceiver 200 with a conventional package, including areceiver portion 210, atransmitter portion 220, anoptical fiber 235, an opticalfiber connection housing 240, and atransceiver housing 280 which encompasses the conventionaloptical transceiver portion 100 ofFIG. 1 , including the light processing cavity. Each of thereceiver portion 210 and thetransmitter portion 220 are fitted with four pins, apower supply pin ground pin data pin data pin 216 or 226). The width and thickness dimensions oftransceiver housing 280 have a significant impact on the profile ofoptical transceiver 200. - As shown in
FIG. 1 , a dimension L1 ofoptical transceiver 100 and/orhousing 180 may be relatively large, compared to the opticalfiber connection housing 280 and transceiver 220 (FIG. 2 ). Relatively large cross-sectional dimensions may be required for thehousing 180 to house or encompass the components ofoptical transceiver 100, based upon their arrangement inFIG. 1 . - However, the optical and optoelectronic network equipment industries seek ever-smaller transceiver packages and/or consumption of less space by functional components in the transceiver. Smaller packages enable more form-fitting network components, and smaller space consumption enables more functionality to be included within the same size package.
- This “Background” section is provided for background information only. The statements in this “Background” are not an admission that the subject matter disclosed in this “Background” section constitutes prior art to the present disclosure, and no part of this “Background” section may be used as an admission that any part of this application, including this “Background” section, constitutes prior art to the present disclosure
- The present invention is directed to an optical device that can reduce the space consumed by optical signal processing components, thereby reducing the size of optical and optoelectronic devices such as optical and optoelectronic transceivers.
- Embodiments of the present invention relate to an optical device, methods for making the optical device, and a method of processing an optical signal (for example, using the device). The optical device generally comprises a light-transmitting medium configured to transmit a first light beam; a light-receiving unit configured to receive and process a focused, reflected light beam; a first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; a lens configured to focus the reflected light beam; and a second mirror configured to reflect the focused, reflected light beam towards the light-receiving unit.
- In various embodiments, the optical device may further comprise (i) a third mirror configured to reflect the reflected light beam towards the second mirror and/or (ii) a light-transmitting unit configured to transmit a second light beam through the first mirror or beam splitter. In one architecture and/or arrangement, the second mirror may be positioned such that a first straight line between the second mirror and the light-receiving unit crosses a second straight line between the light-transmitting medium and the first mirror or beam splitter.
- The method of manufacturing the optical device generally comprises affixing a light-transmitting medium in a housing of the optical device or into an opening in the housing of the optical device, the light-transmitting medium being configured to transmit a first light beam; affixing or adhering a light-receiving unit to the housing, the light-receiving unit being configured to receive and process a focused, reflected light beam; affixing or securing a first mirror or beam splitter within the housing, the first mirror or beam splitter being configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; affixing or mounting a lens to or in the housing, the lens configured to focus the reflected light beam; and affixing a second mirror within the housing in a position configured to reflect the focused, reflected light beam towards the light-receiving unit.
- In various embodiments, the method of manufacturing the optical device may further comprise (1) affixing a light-transmitting unit in the housing or into an opening in the housing, the light-transmitting unit being configured to transmit a second light beam through the first mirror or beam splitter, the second light beam (i) being received by the light-transmitting unit and (ii) having a wavelength different from that of the first light beam, and/or (2) filtering the reflected light beam. In one example, the light-receiving unit comprises a photodiode, and in one architecture and/or arrangement, the light-receiving unit may be positioned at a side of the light-transmitting medium opposite from the second mirror.
- The method of processing an optical signal generally comprises receiving a first light beam from a light-transmitting medium; reflecting at least a first portion of the light beam away from a light-receiving unit; passing the reflected light beam through a lens to focus the reflected light beam; reflecting the reflected light beam towards the light-receiving unit; and receiving the focused, reflected light beam in the light-receiving unit. In various embodiments, the method of processing the optical signal may comprise reflecting the first portion of the light beam using a first mirror or beam splitter, and reflecting the reflected light beam towards the light-receiving unit using a second mirror. In one example, the sum of (i) an angle of incidence of the light beam upon the first mirror or beam splitter and (ii) an angle of incidence of the reflected light beam upon the second mirror is about 45°. In further embodiments, the light-transmitting medium may comprise an optical fiber having an unsheathed end proximate to the light-receiving unit.
- Various embodiments and/or examples disclosed herein may be combined with other embodiments and/or examples, as long as such a combination is not explicitly disclosed herein as being unfavorable, undesirable or disadvantageous.
- The present invention advantageously provides an optical receiver or transceiver with a reduced cavity size, enabling smaller sized packages and/or more functionality to be included within a similar sized package. By arranging components of an optical device according to the present invention (e.g., “folding” a light beam away from a light-receiving unit, in space that might otherwise be unused in the transceiver), the present invention enables an optical device to have a smaller, more compact design.
- These and other advantages of the present invention will become readily apparent from the detailed description of various embodiments below.
-
FIG. 1 is a diagram showing part of a conventional optical transceiver. -
FIG. 2 is a diagram showing an external housing for a conventional optical transceiver. -
FIG. 3A is a diagram showing an exemplary optical device according to the present invention. -
FIG. 3B is a diagram showing a use of the exemplary optical device ofFIG. 3A according to aspects of the present invention. -
FIG. 4A is a diagram showing an alternative optical device in accordance with additional aspects of the present invention. -
FIG. 4B is a diagram showing a use of the alternative optical device ofFIG. 4A . - Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the following embodiments, it will be understood that the descriptions are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents that may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be readily apparent to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present invention.
- The present invention concerns an optical device, generally comprising a light-transmitting medium configured to transmit a first light beam; a light-receiving unit configured to receive and process a focused, reflected light beam; a first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; a lens configured to focus the reflected light beam; and a second mirror configured to reflect the focused, reflected light beam towards the light-receiving unit.
- A further aspect of the invention concerns a method of manufacturing an optical device, generally comprising the steps of affixing a light-transmitting medium in a housing of the optical device or into an opening in the housing of the optical device, the light-transmitting medium configured to transmit a first light beam; affixing or adhering a light-receiving unit to the housing, the light-receiving unit configured to receive and process a focused, reflected light beam; affixing or securing a first mirror or beam splitter within the housing, the first mirror or beam splitter configured to reflect at least a first portion of the transmitted light beam away from the light-receiving unit; affixing or mounting a lens to or in the housing, the lens configured to focus the reflected light beam; and affixing a second mirror within the housing in a position configured to reflect the focused, reflected light beam towards the light-receiving unit.
- Even further aspects of the invention concern a method of processing an optical signal, generally comprising receiving a first light beam from a light-transmitting medium; reflecting at least a first portion of the light beam away from a light-receiving unit; passing the reflected light beam through a lens to focus the reflected light beam; reflecting the focused, reflected light beam towards the light-receiving unit; and receiving the focused, reflected light beam in the light-receiving unit.
- The invention, in its various aspects, will be explained in greater detail below with regard to exemplary embodiments.
- An Exemplary Optical Device
-
FIG. 3A shows an exemplaryoptical device 300 according to the present invention.Optical device 300 may be an optical transceiver or other device capable of receiving and processing an optical signal.Optical device 300 may comprise or be contained within ahousing 380. Thehousing 380 may have an opening through which a light-carrying or light-transmittingmedium 335 is placed. The light-transmittingmedium 335 may comprise an optical fiber which may be surrounded (or sheathed) by aceramic material 330. A portion of the optical fiber may be uncovered (or unsheathed) at an end closest to a light-receivingunit 310. The light-carrying or light-transmittingmedium 335 may be configured to carry or transmit a light beam or optical signal. Typically, the light beam or optical signal is a diffuse light beam or optical signal (e.g., slightly cone-shaped and/or having a characteristic enlargement or spreading of the beam size, width or diameter as a function of distance), but the invention is also applicable to other light beams or optical signals, such as polarized and/or collimated light beams or optical signals. In many embodiments, more than one signal may be simultaneously carried or transmitted by the light-transmittingmedium 335, each signal having a different wavelength. For example, a first signal at a first wavelength or wavelength band may be received byoptical device 300, and a second signal at a second wavelength or wavelength band significantly different from the first wavelength or wavelength band may be transmitted byoptical device 300. - The
optical device 300 comprises afirst beam splitter 340 configured to reflect at least a portion of the light beam emitted from light-transmittingmedium 335.First beam splitter 340 and light-transmittingmedium 335 may be aligned such that the light beam transmitted by light-transmittingmedium 335 is incident uponfirst beam splitter 340. In one embodiment, the angle of incidence of the transmitted light beam uponfirst beam splitter 340 may be about 45° (e.g., exactly 45°). When the optical device includes a receiver that does not have a transmitter (e.g., 320) aligned with the light-transmitting medium (e.g., 335), thebeam splitter 340 may be or comprise a mirror. -
First beam splitter 340 reflects at least a portion of the light beam away from the light-receiving unit 310 (see, e.g.,FIG. 3B ). The reflected portion of the light beam may comprise light of a first wavelength. In one embodiment, all light transmitted from the light-transmittingmedium 335 to thefirst beam splitter 340 is reflected.First beam splitter 340 may also allow a second beam (or a second portion of the incident light beam) to pass through. The light which passes throughfirst beam splitter 340 generally comprises light of a second wavelength, where the second wavelength is different from the first wavelength. The first and second wavelengths may differ by a minimum of about 100-200 nm, generally up to about 500-1000 nm. Alternatively, the first and second wavelengths may differ by at least about 5, 10, 15 or 20%, up to as much as 25, 50 or 100%. In various embodiments, thefirst beam splitter 340 may comprise a dichroic mirror, a wavelength selective filter (made of or coated with a reflective material), a polarization component, an amplitude modulation mask, a phase modulation mask, a hologram, and/or a grating. - The
optical device 300 may further comprise a light-transmittingunit 320 which may be configured to transmit light that passes throughfirst beam splitter 340. Light-transmittingunit 320 and light-transmittingmedium 335 may be aligned such that the light beam or optical signal transmitted by light-transmittingunit 320 enters or is incident upon the end of light-transmittingmedium 335. Light-transmittingunit 320 may be configured to transmit a second light beam or optical signal throughfirst beam splitter 340, the second light beam being received by the light-transmittingmedium 335. In other words,optical device 300 may be configured as a bi-directional (BIDI) optical device. Alternatively, a second portion of the light beam emitted the light-carryingmedium 335 towards thefirst beam splitter 340 may pass through thefirst beam splitter 340 and be received by a second light-receiving unit (not shown). - However, in the case where the light beam emitted the light-carrying
medium 335 is diffuse, the portion of the light beam passing through thefirst beam splitter 340 should be focused by a second lens before being reflected by a mirror or beam splitter in a second light-processing unit (not shown) substantially similar to that shown inFIG. 3A . - The
optical device 300 may also comprisemirrors 345 and 360 (which may be referred to as, for example,intermediate mirror 345 and final mirror 360) configured to reflect light fromfirst beam splitter 340 towards the light-receivingunit 310. In one embodiment, the angle of incidence of the reflected light beam uponintermediate mirror 345 may be about 45° (e.g., exactly 45°).Intermediate mirror 345 may be positioned at an angle of about 90° (e.g., exactly 90°) with respect tofirst beam splitter 340. -
Final mirror 360 may be configured to reflect the light beam towards the light-receivingunit 310. The light beam which is incident uponfinal mirror 360 may be the focused light beam which has passed throughlens 350.Final mirror 360 may be positioned at an angle of about 90° (e.g., exactly 90°) with respect tointermediate mirror 345.Final mirror 360 may be positioned such that a light beam reflected fromfinal mirror 360 is in a direct path toward light-receivingunit 310. - The
optical device 300 may also comprise alens 350 configured to focus the reflected light beam (see, e.g.,FIG. 3B ). Thelens 350 may focus the received and/or incident light that passes through thelens 350, and is thus particularly advantageous when the receivedlight beam 390 is a diffuse light beam.Lens 350 may be a half ball lens, which may comprise a curved surface facingintermediate mirror 345 and a flat surface facingfinal mirror 360. - Alternatively, the lens may comprise a concave lens, a convex lens, and/or or a combination of concave or convex lenses.
Lens 350 can be placed anywhere in the light path (e.g., betweenfirst beam splitter 340 andintermediate mirror 345, betweenfinal mirror 360 and light-receivingunit 310, etc.), but doing so may affect the extent of the cavity size reduction and, when the light beam is diffuse, the diameter or width of the light beam at certain points in the device 300 (e.g., as it enters the receiver 310). - The
optical device 300 may also comprise afilter 370 betweenfinal mirror 360 and light-receivingunit 310, configured to filter (e.g., reduce the wavelength band of) the light beam traveling betweenfinal mirror 360 and light-receivingunit 310.Filter 370 may comprise material(s) known in the art that are capable of blocking certain predetermined wavelengths of light from passing through. Thefilter 370 can be placed elsewhere along the light path (see, e.g.,FIG. 3B ). For example, filter 370 may be placed betweenfirst beam splitter 340 andintermediate mirror 345, betweenlens 350 andfinal mirror 360, or attached to, affixed to or integrated within thelens 350, etc. - The
optical device 300 may also comprise a light-receivingunit 310. The light-receivingunit 310 may comprise (1) a photodiode (e.g., a PIN photodiode) or other light-detecting component(s) and (2) an amplifier (e.g., a transimpedence amplifier and/or a limiting amplifier). The light-receivingunit 310 may be positioned at a side of the light-transmittingmedium 335 opposite fromfinal mirror 360. Light-receivingunit 310 may be configured to receive the light beam fromfinal mirror 360. - Thus, due to the arrangement of
optical device 300 ofFIG. 3A , the dimension L2 ofoptical transceiver 300 and/orhousing 380 may be relatively small, as compared to the dimension L1 ofFIG. 1 . A relatively small cross-sectional dimension enables thehousing 380 to have a smaller profile, fit in a smaller package, and/or house or encompass additional components (and thus additional functionality) withinoptical device 300. -
FIG. 3B shows a path that a light beam may take within the light processing cavity ofoptical device 300 ofFIG. 3A . Referring toFIG. 3B , a light beam (or optical signal) 390 may be emitted from light-transmittingmedium 335, after which thelight beam 390 is incident uponfirst beam splitter 340, where it is reflected in whole or in part towardsintermediate mirror 345 as reflectedlight beam 392.Intermediate mirror 345 reflects thelight beam 392 throughlens 350, which focuses the reflectedlight beam 394. When thelight beam 392 is diffuse,light beam 394 will have a smaller size, width or diameter thanlight beam 392. The focusedlight beam 396 is incident uponfinal mirror 360, which reflects the focusedlight beam 396 towards light-receivingunit 310. The focused, reflectedlight beam 398 is received in or on the light-receivingunit 310 after passing throughfilter 370. - As shown in
FIG. 3B , the components ofoptical device 300 may be arranged such that a first straight line between thefinal mirror 360 and the light-receivingunit 310 crosses a second straight line between the light-transmittingmedium 335 and thefirst beam splitter 340. The first and second straight lines may be perpendicular to each other (e.g., may cross each other at right angles). A third straight line betweenfinal mirror 360 andintermediate mirror 345 may be parallel to the second straight line between the light-transmittingmedium 335 and thefirst beam splitter 340. A fourth straight line betweenintermediate mirror 345 andfirst beam splitter 340 may be parallel to the first straight line between thefinal mirror 360 and the light-receivingunit 310. - The
lens 350 may be in the path of the third straight line betweenfinal mirror 360 andintermediate mirror 345. Alternatively,lens 350 may be in the path of the first straight line betweenfinal mirror 360 and receiver 310 (e.g., it may be mounted on receiver 310), or in the path of the fourth straight line betweenfirst beam splitter 340 andintermediate mirror 345. In the case wherefinal mirror 360 comprises a dichroic mirror, wavelength selective filter, polarization component, amplitude and/or phase modulation mask, hologram and/or grating,intermediate mirror 345 may be on the second straight line, on a side of thefinal mirror 360 opposite from the light-receivingunit 310. Light-transmittingunit 320 may be on the first straight line at a side of thefirst beam splitter 340 opposite from the light-transmittingmedium 335. - An Alternative Optical Device
-
FIG. 4A shows an alternative optical device (e.g., an optical transceiver) 400 in accordance with additional aspects of the present invention.Optical device 400 may comprise or be contained within ahousing 480.Optical device 400 may comprise a light-transmittingmedium 435 having asheath 430, a light-receivingunit 410, afirst beam splitter 440, a light-transmittingunit 420, alens 450, asecond mirror 460, and afilter 470 in an arrangement similar to optical device 300 (seeFIG. 3A ). However, as shown inFIG. 4A ,optical device 400 includes only two mirrors (or a mirror and a beam splitter). - For example,
first beam splitter 440 and light-transmittingmedium 435 may be aligned such that the light beam transmitted by light-transmittingmedium 435 is incident uponbeam splitter 440 at an angle of about 13° (e.g., 13±0.5° [or any positive amount less than 0.5°], and in one embodiment, exactly 13°). Such an angle of incidence of thefirst beam splitter 440 may be advantageous in the case where the received light beam (e.g.,light beam 490 inFIG. 4B ) is polarized and/or collimated, but theoptical device 400 is also effective and advantageous when the received light beam is diffuse.Second mirror 460 andfirst beam splitter 440 may be aligned such that the light beam reflected byfirst beam splitter 440 is incident uponsecond mirror 460 at an angle of about 32° (e.g., 32±0.5° [or any positive amount less than 0.5°], and in the same embodiment, exactly 32°). Thus, a sum of (i) an angle of incidence of the light beam upon thefirst beam splitter 440 and (ii) an angle of incidence of the light beam upon thesecond mirror 450 may equal about 45° (e.g., 45±0.5° [or any positive amount less than 0.5°], and in the embodiment shown inFIG. 4A , exactly 45°). - Similar to
optical device 300 inFIG. 3A , due to the arrangement of components within theoptical device 400 ofFIG. 4A , a dimension L3 ofoptical transceiver 400 and/orhousing 480 may be relatively small, compared to the dimension L1 ofFIG. 1 and the dimension L2 ofFIG. 3A . A relatively small cross-sectional dimension enables thehousing 480 to have a smaller profile, fit in a smaller package, and/or house or encompass additional components withinoptical device 400. -
FIG. 4B shows a path that a light beam may take in the optical device ofFIG. 4A (i.e., optical device 400). Referring toFIG. 4B , a light beam (or optical signal) 490 may emanate from light-transmittingmedium 435, after which thelight beam 490 is incident uponfirst beam splitter 440, where it is reflected in whole or in part towardslens 450 as reflectedlight beam 492. After passing throughlens 450, the focusedlight beam 496 is incident uponsecond mirror 460, which reflects thelight beam 496 towards light-receivingunit 410, wherein the reflected, focusedlight beam 498 is received in or at the light-receivingunit 410. - As shown in
FIG. 4B , the components ofoptical device 400 may be arranged such that a first straight line between thesecond mirror 460 and the light-receivingunit 410 crosses a second straight line between the light-transmittingmedium 435 and thefirst beam splitter 440. The first and second straight lines may be perpendicular to each other (e.g., may cross each other at right angles). A third straight line betweensecond mirror 460 andfirst beam splitter 440 may be neither parallel nor perpendicular to either the first straight line or the second straight line, but may be normal or perpendicular to the surface of the lens 450 (e.g., the planar surface of half-ball lens 450). Thus, thelens 450 may be in the path of the third straight line betweensecond mirror 460 andfirst beam splitter 440.Second mirror 460 may be at an opposite side of the second straight line from thelight receiving unit 410. Light-transmittingunit 420 andfirst beam splitter 440 may be at an opposite side of the first straight line from the light-transmittingmedium 435. - Thus, the present invention provides an optical device, methods for making the optical device, and a method of processing an optical signal (for example, processing the optical signal using the device).
- The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.
Claims (20)
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2011
- 2011-08-17 US US13/212,137 patent/US9213156B2/en active Active
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2012
- 2012-06-30 CN CN201210221556.4A patent/CN102854581B/en active Active
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2015
- 2015-11-12 US US14/939,747 patent/US9568680B1/en active Active
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Publication number | Publication date |
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CN102854581B (en) | 2015-03-11 |
CN102854581A (en) | 2013-01-02 |
US20130044977A1 (en) | 2013-02-21 |
US9568680B1 (en) | 2017-02-14 |
US9213156B2 (en) | 2015-12-15 |
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