CA2078316A1 - Optical equalizer - Google Patents

Optical equalizer

Info

Publication number
CA2078316A1
CA2078316A1 CA 2078316 CA2078316A CA2078316A1 CA 2078316 A1 CA2078316 A1 CA 2078316A1 CA 2078316 CA2078316 CA 2078316 CA 2078316 A CA2078316 A CA 2078316A CA 2078316 A1 CA2078316 A1 CA 2078316A1
Authority
CA
Canada
Prior art keywords
optical
frequency components
time delays
optical fiber
delay characteristic
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA 2078316
Other languages
French (fr)
Other versions
CA2078316C (en
Inventor
Takeshi Ozeki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Individual
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
Priority claimed from JP27854791A external-priority patent/JPH0588118A/en
Priority claimed from JP3339595A external-priority patent/JPH05150123A/en
Application filed by Individual filed Critical Individual
Publication of CA2078316A1 publication Critical patent/CA2078316A1/en
Application granted granted Critical
Publication of CA2078316C publication Critical patent/CA2078316C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2726—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide
    • G02B6/274—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide based on light guide birefringence, e.g. due to coupling between light guides
    • 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
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters

Abstract

When a light wave passes through an optical fiber used as an optical communication line, different time delays are introduced in its frequency components according to the delay characteristic of the optical fiber, limiting the usable bandwidth. An optical equalizer according to the present invention comprises a multi-stage connection of one or more unit optical circuit elements for introducing time delays opposite to the delay characteristic of the optical fiber in frequency components in the neighborhood of the transmission band used. The optical equalizer is placed at the input end of a transmission line and equalizes time delays of the frequency components passing through the transmission line, thereby expanding the usable bandwidth.
CA002078316A 1991-09-30 1992-09-15 Optical equalizer Expired - Fee Related CA2078316C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP27854791A JPH0588118A (en) 1991-09-30 1991-09-30 Optical equalizing circuit
JP3-278547 1991-09-30
JP3-339595 1991-11-30
JP3339595A JPH05150123A (en) 1991-11-30 1991-11-30 Optical equalizing circuit

Publications (2)

Publication Number Publication Date
CA2078316A1 true CA2078316A1 (en) 1993-03-31
CA2078316C CA2078316C (en) 1998-06-16

Family

ID=26552918

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002078316A Expired - Fee Related CA2078316C (en) 1991-09-30 1992-09-15 Optical equalizer

Country Status (2)

Country Link
US (1) US5259048A (en)
CA (1) CA2078316C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0815556A (en) * 1994-06-29 1996-01-19 Shin Etsu Chem Co Ltd Broad band optical fiber coupler and its production
US5596661A (en) * 1994-12-28 1997-01-21 Lucent Technologies Inc. Monolithic optical waveguide filters based on Fourier expansion
US5587827A (en) * 1995-02-01 1996-12-24 Hakimi; Hosain Apparatus for compensating chromatic and polarization dispersion and frequency chirp in fiber optics and for pulse compression in laser systems
US5903683A (en) * 1997-09-10 1999-05-11 The United States Of America As Represented By The National Security Agency Device for modulating an optical signal using a single wave guide
US6735358B2 (en) * 2001-02-07 2004-05-11 Nippon Telegraph And Telephone Corporation Optical multiplexer and optical demultiplexer
DE10147227B4 (en) * 2001-09-14 2013-09-05 Finisar Corp. Optical filter and method for optical filtering
US20030185573A1 (en) * 2002-03-28 2003-10-02 Fells Julian A. Optical transmission systems
US20030185500A1 (en) * 2002-03-28 2003-10-02 Fells Julian A. Optical transmission systems
CN113568098B (en) * 2021-07-05 2023-09-12 烽火通信科技股份有限公司 Design method of beam splitter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1238535B (en) * 1989-11-14 1993-08-18 Cselt Centro Studi Lab Telecom COHERENT COMMUNICATION SYSTEM IN OPTICAL FIBER WITH DIFFERENT POLARIZATION IN TRANSMISSION
US5191631A (en) * 1991-12-19 1993-03-02 At&T Bell Laboratories Hybrid optical fiber and method of increasing the effective area of optical transmission using same
US5185826A (en) * 1992-02-07 1993-02-09 At&T Bell Laboratories Hybrid pumping arrangement for doped fiber amplifiers

Also Published As

Publication number Publication date
CA2078316C (en) 1998-06-16
US5259048A (en) 1993-11-02

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed