WO2009054883A4 - Silicon-based optical modulator for analog applications - Google Patents

Silicon-based optical modulator for analog applications Download PDF

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Publication number
WO2009054883A4
WO2009054883A4 PCT/US2008/011560 US2008011560W WO2009054883A4 WO 2009054883 A4 WO2009054883 A4 WO 2009054883A4 US 2008011560 W US2008011560 W US 2008011560W WO 2009054883 A4 WO2009054883 A4 WO 2009054883A4
Authority
WO
WIPO (PCT)
Prior art keywords
optical
waveguiding
silicon
input
siscap
Prior art date
Application number
PCT/US2008/011560
Other languages
French (fr)
Other versions
WO2009054883A1 (en
Inventor
Kapendu Shastri
Prakash Gothoskar
Vipulkumar Patel
David Piede
Mark Webster
Original Assignee
Lightwire Inc
Kapendu Shastri
Prakash Gothoskar
Vipulkumar Patel
David Piede
Mark Webster
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lightwire Inc, Kapendu Shastri, Prakash Gothoskar, Vipulkumar Patel, David Piede, Mark Webster filed Critical Lightwire Inc
Priority to CN2008801119078A priority Critical patent/CN101960345B/en
Publication of WO2009054883A1 publication Critical patent/WO2009054883A1/en
Publication of WO2009054883A4 publication Critical patent/WO2009054883A4/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/225Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure
    • G02F1/2255Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure controlled by a high-frequency electromagnetic component in an electric waveguide structure
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/015Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements with at least one potential jump barrier, e.g. PN, PIN junction
    • G02F1/0151Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements with at least one potential jump barrier, e.g. PN, PIN junction modulating the refractive index
    • G02F1/0152Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements with at least one potential jump barrier, e.g. PN, PIN junction modulating the refractive index using free carrier effects, e.g. plasma effect
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/225Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure
    • G02F1/2257Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure the optical waveguides being made of semiconducting material

Abstract

A silicon-insulator-silicon capacitive (SISCAP) optical modulator is configured to provide analog operation for applications which previously required the use of relatively large, power-consuming and expensive lithium niobate devices. An MZI- based SISCAP modulator (preferably a balanced arrangement with a SISCAP device on each arm) is responsive to an incoming RF electrical signal and is biased in a region where the capacitance of the device is essentially constant and the transform function of the MZI is linear.

Claims

AMENDED CLAIMS received by the International Bureau on 1st June 2009 (01.06.09)
1. An analog optical modulator formed within an SOI structure including a silicon substrate, an overlying oxide layer and a relatively thin silicon surface waveguiding layer, the analog optical modulator comprising an optical interferometer formed within the relatively thin silicon surface waveguiding layer, the interferometer including an input optical waveguide, a pair of parallel waveguiding arms and an output optical waveguide, with an input Y-splitter disposed between the input optical waveguide and the input to the pair of parallel waveguiding arms and an output Y-combiner disposed between the output of the pair of parallel waveguiding arms and the output optical waveguide, a continuous wave (CW) optical input signal coupled into the input optical waveguide; and at least one silicon-insulator-silicon capacitance (SISCAP) optical waveguiding device disposed at least one of said pair of parallel waveguiding arms, the SISCAP optical waveguiding device comprising a first silicon region within the relatively thin silicon surface waveguiding layer doped to exhibit a first conductivity type; a second silicon region disposed to overlap, in part, the first silicon region, the second silicon region doped to exhibit a second, opposite conductivity type; a relatively thin dielectric layer disposed in the overlap area between said first and second doped silicon regions, the combination of said first and second doped silicon regions with the interposed relatively thin dielectric layer defining the active region of the electro-optic device; a voltage bias source applied across the at least one SISCAP optical waveguiding device to create a predetermined, constant capacitance value across said at least one SISCAP optical waveguiding device, forming a linear operating region for the analog optical modulator; and an input RF electrical signal coupled to the second silicon region of the at least one SISCAP device, wherein the application of said input RF electrical signal, in combination with the voltage bias, modifies the phase of an optical signal passing therethrough to create a modulated analog optical output signal along the optical output waveguide which replicates the input RF electrical signal,
2. The modulator as defined in claim 1 wherein the at least one SISCAP optical waveguiding device comprises a pair of SISCAP optical waveguiding devices, with a first device of said pair disposed along the first optical waveguiding arm of the interferometer and a second device of said pair disposed along the second optical waveguiding arm of said interferometer.
3. The modulator as defined in claim 2 wherein the pair of SISCAP optical waveguiding devices are cross-coupled into a common mode configuration, the input RP signal applied to a cross-coupled connection of the second silicon region of one SISCAP device with the first silicon of the remaining SISCAP device.
4. The modulator as defined in claim 3 wherein the voltage bias is maintained at an essentially zero voltage level.
5. The modulator as defined in claim 4 wherein the modulator further comprises a low pass electrical filter coupled across the first SISCAP optical waveguiding device to substantiate operation with a zero bias voltage.
6. The modulator as defined in claim 5 wherein the low pass electrical filter is integrated within the same SOI structure as the modulator.
7. The modulator as defined in claim 3 wherein the voltage bias is provided by a constant DC voltage source coupled to the remaining cross-coupled pair of regions to maintain an essentially constant DC bias voltage.
8. An integrated optical communication system formed within an SOI structure comprising a silicon substrate, an overlying insulating layer and a surface silicon waveguiding layer, the integrated optical communication system comprising an analog optical modulator including an optical interferometer formed within the relatively thin silicon surface waveguiding layer, the interferometer including an input optical waveguide, a pair of parallel waveguiding arms and an output optical waveguide, with an input Y-splitter disposed between the input optical waveguide and the input to the pair of parallel waveguiding arms and an output Y-combiner disposed between the output of the pair of parallel waveguiding arms and the output optical waveguide, a continuous wave (CW) optical input signal coupled into the input optical waveguide; and at least one silicon-insulator-silicon capacitance (SISCAP) optical waveguiding device disposed at least one of said pair of parallel waveguiding arms, the SISCAP optical waveguiding device comprising a first silicon region within the relatively thin silicon surface waveguiding layer doped to exhibit a first conductivity type;
19 a second silicon region disposed to overlap, in part, the first silicon region, the second silicon region doped to exhibit a second, opposite conductivity type; a relatively thin dielectric layer disposed in the overlap area between said first and second doped silicon regions, the combination of said first and second doped silicon regions with the interposed relatively thin dielectric layer defining the active region of the electro-optic device; a voltage bias source applied across the at least one SISCAP optical waveguiding device to create a predetermined, constant capacitance value across said at least one SISCAP optical waveguiding device, forming a linear operating region for the analog optical modulator; and an input RF electrical signal coupled to the second silicon region of the at least one SISCAP device, wherein the application of said input RF electrical signal, in combination with the voltage bias, modifies the phase of an optical signal passing therethrough to create a modulated analog optical output signal along the optical output waveguide which replicates the input RF electrical signal; and at least one optical component integrated within the SOI structure with the analog modulator; and at least one electrical component integrated within the SOI structure with the analog modulator.
9. The system as defined in claim 8 wherein the at least one optical component comprises a photodetecting device,
10. The system as defined in claim 9 wherein the at least one optical component further comprises an out-coupling waveguide disposed between a selected portion of the interferometer and the photodetecting device such that the photodetecting device provides an electrical signal representative of the performance of said interferometer.
11. The system as defined in claim 8 wherein the at least one electrical component comprises a transimpedance amplifier coupled to the input of the analog optical modulator.
12. A silicon-based arrangement integrated within a single SOI structure, comprising a silicon substrate, an overlying insulating layer and a surface silicon layer, the arrangement comprising
20 a plurality of N analog optical modulators interconnected in a predetermined array configuration, each analog modulator comprising: an optical interferometer formed within the relatively thin silicon surface waveguiding layer, the interferometer including an input optical waveguide, a pair of parallel waveguiding arms and an output optical waveguide, with an input Y-splitter disposed between the input optical waveguide and the input to the pair of parallel waveguiding arms and an output Y-combiner disposed between the output of the pair of parallel waveguiding arms and the output optical waveguide, a continuous wave (CW) optical input signal coupled into the input optical waveguide; and at least one silicon-insulator-silicon capacitance (SISCAP) optical waveguiding device disposed at least one of said pair of parallel waveguiding arms, the SISCAP optical waveguiding device comprising a First silicon region within the relatively thin silicon surface waveguiding layer doped to exhibit a first conductivity type; a second silicon region disposed to overlap, in part, the first silicon region, the second silicon region doped to exhibit a second, opposite conductivity type; a relatively thin dielectric layer disposed in the overlap area between said first and second doped silicon regions, the combination of said first and second doped silicon regions with the interposed relatively thin dielectric layer defining the active region of the electro-optic device; a voltage bias source applied across the at least one SISCAP optical waveguiding device to create a predetermined, constant capacitance value across said at least one SISCAP optical waveguiding device, forming a linear operating region for the analog optical modulator; and an input RF electrical signal coupled to the second silicon region of the at least one SISCAP device, wherein the application of said input RF electrical signal, in combination with the voltage bias, modifies the phase of an optical signal passing therethrough to create a modulated analog optical output signal along the optical output waveguide which replicates the input RF electrical signal; and
21 a plurality of optical waveguides, formed within the silicon surface layer and arranged to form connections between the separate analog optical modulators of the plurality of N analog optical modulators,
13. The arrangement as defined in claim 12 wherein a select group of optical waveguides within the plurality of optical waveguides are disposed to create optical signal splitters between certain ones of the plurality of N analog optical modulators.
14. The arrangement as defined in claim 12 wherein a select group of optical waveguides within the plurality of optical waveguides are disposed to create optical signal combiners between certain ones of the plurality of N analog optical modulators. v
22
PCT/US2008/011560 2007-10-19 2008-10-08 Silicon-based optical modulator for analog applications WO2009054883A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008801119078A CN101960345B (en) 2007-10-19 2008-10-08 Silicon-based optical modulator for analog applications

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US99978407P 2007-10-19 2007-10-19
US60/999,784 2007-10-19
US18897508P 2008-08-13 2008-08-13
US61/188,975 2008-08-13
US12/287,366 2008-10-08
US12/287,366 US7657130B2 (en) 2007-10-19 2008-10-08 Silicon-based optical modulator for analog applications

Publications (2)

Publication Number Publication Date
WO2009054883A1 WO2009054883A1 (en) 2009-04-30
WO2009054883A4 true WO2009054883A4 (en) 2009-07-16

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US (1) US7657130B2 (en)
CN (1) CN101960345B (en)
WO (1) WO2009054883A1 (en)

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Also Published As

Publication number Publication date
US20090103850A1 (en) 2009-04-23
CN101960345B (en) 2013-01-02
US7657130B2 (en) 2010-02-02
WO2009054883A1 (en) 2009-04-30
CN101960345A (en) 2011-01-26

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