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CA2083219A1 - Emetteur optique muni d'un modulateur optique - Google Patents

Emetteur optique muni d'un modulateur optique

Info

Publication number
CA2083219A1
CA2083219A1 CA2083219A CA2083219A CA2083219A1 CA 2083219 A1 CA2083219 A1 CA 2083219A1 CA 2083219 A CA2083219 A CA 2083219A CA 2083219 A CA2083219 A CA 2083219A CA 2083219 A1 CA2083219 A1 CA 2083219A1
Authority
CA
Canada
Prior art keywords
optical
electrode
signal
transmitter
modulator
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
CA2083219A
Other languages
English (en)
Other versions
CA2083219C (fr
Inventor
Hiroshi Nishimoto
Takatoshi Minami
Hironao Hakogi
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.)
Fujitsu Ltd
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 JP30289391A external-priority patent/JP3167383B2/ja
Priority claimed from JP32203391A external-priority patent/JPH05158004A/ja
Priority claimed from JP4027755A external-priority patent/JP2630536B2/ja
Application filed by Individual filed Critical Individual
Publication of CA2083219A1 publication Critical patent/CA2083219A1/fr
Application granted granted Critical
Publication of CA2083219C publication Critical patent/CA2083219C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/21—Devices 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
    • G02F1/225—Devices 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
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
    • 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
    • H04B10/50—Transmitters
    • H04B10/564—Power control
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/21—Devices 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
    • G02F1/225—Devices 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
    • G02F1/2255—Devices 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/20—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 delay line
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F2203/00—Function characteristic
    • G02F2203/20—Intrinsic phase difference, i.e. optical bias, of an optical modulator; Methods for the pre-set thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F2203/00—Function characteristic
    • G02F2203/21—Thermal instability, i.e. DC drift, of an optical modulator; Arrangements or methods for the reduction thereof

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
CA002083219A 1991-11-19 1992-11-18 Emetteur optique muni d'un modulateur optique Expired - Lifetime CA2083219C (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP3-302893 1991-11-19
JP30289391A JP3167383B2 (ja) 1991-11-19 1991-11-19 光送信機
JP3-322033 1991-12-05
JP32203391A JPH05158004A (ja) 1991-12-05 1991-12-05 光変調器
JP4-027755 1992-02-14
JP4027755A JP2630536B2 (ja) 1992-02-14 1992-02-14 光送信装置

Publications (2)

Publication Number Publication Date
CA2083219A1 true CA2083219A1 (fr) 1993-05-20
CA2083219C CA2083219C (fr) 1999-01-05

Family

ID=27285937

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002083219A Expired - Lifetime CA2083219C (fr) 1991-11-19 1992-11-18 Emetteur optique muni d'un modulateur optique

Country Status (4)

Country Link
US (1) US5359449A (fr)
EP (2) EP0547394B1 (fr)
CA (1) CA2083219C (fr)
DE (1) DE69221839T2 (fr)

Families Citing this family (81)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE36088E (en) * 1990-03-01 1999-02-09 Fujitsu Limited Optical transmitter
JP3226067B2 (ja) * 1992-10-03 2001-11-05 キヤノン株式会社 光通信方法及び光通信システム
US5515195A (en) * 1993-06-25 1996-05-07 Optivision Incorporated Optical bus using controllable optical devices
US5621839A (en) * 1993-08-26 1997-04-15 Ngk Insulators, Ltd. Optical waveguide device having substrate made of ferroelectric crystals
JPH07131421A (ja) * 1993-11-01 1995-05-19 Hitachi Ltd 光増幅装置と光伝送装置およびその制御方法と監視情報転送方法
DE4342184A1 (de) * 1993-12-10 1995-06-14 Sel Alcatel Ag Optischer Sender mit linearisierendem Netzwerk
JPH07294860A (ja) * 1994-04-25 1995-11-10 Fuji Photo Film Co Ltd 電気光学光変調装置
US5617500A (en) * 1994-05-20 1997-04-01 Nikon Corporation System for detecting an optical information and scanning microscope system
JPH0815556A (ja) * 1994-06-29 1996-01-19 Shin Etsu Chem Co Ltd 広帯域光ファイバカプラおよびその製造方法
JP3499605B2 (ja) * 1994-09-07 2004-02-23 株式会社東芝 光外部強度変調器
DE69531328T2 (de) * 1994-09-12 2004-02-12 Nippon Telegraph And Telephone Corp. Intensitätsmoduliertes optisches Übertragungssystem
JP2677234B2 (ja) * 1995-03-17 1997-11-17 日本電気株式会社 光変調装置
JP3345214B2 (ja) * 1995-03-20 2002-11-18 ケイディーディーアイ株式会社 短光パルス変調方法およびその装置
JPH08262382A (ja) * 1995-03-28 1996-10-11 Ando Electric Co Ltd 光変調装置
FR2740285B1 (fr) * 1995-10-23 1997-11-21 Alcatel Submarcom Dispositif de modulation d'amplitude a modulateur a electro-absorption
US5647029A (en) * 1995-11-27 1997-07-08 Lucent Technologies Inc. Traveling wave quantum well waveguide modulators using velocity matching for improved frequency performance
JPH09181682A (ja) * 1995-12-26 1997-07-11 Fujitsu Ltd 光変調器の駆動回路及び光送信機
JP3603238B2 (ja) * 1996-03-19 2004-12-22 富士通株式会社 時分割光多重化装置
US5907426A (en) * 1996-06-28 1999-05-25 Kabushiki Kaisha Toyota Chuo Kenkyusho Stabilizing device for optical modulator
JP2820138B2 (ja) * 1996-11-26 1998-11-05 日本電気株式会社 光変調装置
FR2756440B1 (fr) * 1996-11-28 1998-12-31 Alsthom Cge Alcatel Dispositif d'emission de donnees optiques
WO1998028659A1 (fr) 1996-12-23 1998-07-02 Dsc Communications A/S Procede et dispositif pour moduler la lumiere dans un circuit de modulation a modulateur de mach-zehnder
US5999667A (en) * 1997-02-27 1999-12-07 Pirelli Cavi E Sistemi S.P.A. Method for reducing rejects in the manufacture of integrated optical components
US6091864A (en) * 1997-04-10 2000-07-18 Ortel Corporation Linear optical modulator for providing chirp-free optical signals
US5870512A (en) * 1997-05-30 1999-02-09 Sdl, Inc. Optimized interferometrically modulated array source
SE522272C2 (sv) * 1997-08-20 2004-01-27 Ericsson Telefon Ab L M Optiskt duobinärt sändarsystem och förfarande som använder optisk intensitetsmodulering
JP3913856B2 (ja) * 1997-08-28 2007-05-09 富士通株式会社 光パルス生成装置、分散測定装置、分散補償装置及び分散測定方法
FR2787593B1 (fr) * 1998-12-17 2001-02-02 Cit Alcatel Modulateur de type mach-zehnder presentant un taux d'extinction tres eleve
JP2000241778A (ja) 1999-02-19 2000-09-08 Fujitsu Ltd 光通信装置および光分岐・挿入装置
US7127172B1 (en) 1999-06-02 2006-10-24 Massachusetts Institute Of Technology Optical frequency filter
US6222965B1 (en) * 1999-07-08 2001-04-24 Agere Systems Opto Electronics Guardian Inc. Bias control system for electrooptic devices
US6169624B1 (en) * 1999-08-11 2001-01-02 Asif A. Godil Achromatic optical modulators
US6252557B1 (en) 1999-09-30 2001-06-26 Lockheed Martin Corporation Photonics sensor array for wideband reception and processing of electromagnetic signals
US6510255B2 (en) * 1999-12-24 2003-01-21 Matsushita Electric Industrial Co., Ltd. Optical transmission apparatus
JP2002023122A (ja) * 2000-06-30 2002-01-23 Mitsubishi Electric Corp 光送信装置およびこれに用いる光変調器のバイアス電圧制御方法
JP2002049015A (ja) * 2000-08-07 2002-02-15 Fujitsu Ltd 変調制御回路
US7065302B1 (en) * 2000-09-15 2006-06-20 Lockheed Martin Corporation High efficiency optical feedback modulator and method of operation
JP3703013B2 (ja) * 2001-01-26 2005-10-05 日本電信電話株式会社 干渉計光回路及びその製造方法
US6490385B1 (en) * 2001-05-24 2002-12-03 Nortel Networks Limited Dimensionally stable device construction
US6590691B1 (en) * 2001-07-02 2003-07-08 Phasebridge, Inc. Hybridly integrated optical modulation devices
GB2383706B (en) 2001-11-30 2005-03-30 Marconi Optical Components Ltd Modulation control
JP3772738B2 (ja) * 2001-12-13 2006-05-10 日本電気株式会社 光変調装置
JP3764686B2 (ja) * 2002-02-07 2006-04-12 日本電信電話株式会社 光送信回路
JP3806043B2 (ja) * 2002-02-07 2006-08-09 富士通株式会社 光導波路デバイス
JP3881270B2 (ja) * 2002-03-26 2007-02-14 富士通株式会社 光変調器の駆動制御装置および駆動制御方法
JP3883919B2 (ja) * 2002-07-16 2007-02-21 富士通株式会社 状態検出機能を備えた光送信装置
JP3672257B2 (ja) * 2002-08-09 2005-07-20 住友大阪セメント株式会社 外部光変調器の動作点／光出力安定化方法及び装置
FI20021583A0 (fi) * 2002-09-04 2002-09-04 Valtion Teknillinen Menetelmä optoelektronisen komponentin ohjaamiseksi
TW583399B (en) * 2002-12-31 2004-04-11 Ind Tech Res Inst An optical sensor for electromagnetic field
US7099586B2 (en) * 2003-09-04 2006-08-29 The Regents Of The University Of California Reconfigurable multi-channel all-optical regenerators
US7343059B2 (en) * 2003-10-11 2008-03-11 Hewlett-Packard Development Company, L.P. Photonic interconnect system
US7734194B2 (en) * 2004-03-17 2010-06-08 Nippon Telegraph And Telephone Corporation Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system
JP4927358B2 (ja) * 2004-07-27 2012-05-09 ジェイディーエス ユニフェイズ コーポレーション バッファ層を有する低バイアス・ドリフト変調器
US7405861B2 (en) 2004-09-27 2008-07-29 Idc, Llc Method and device for protecting interferometric modulators from electrostatic discharge
US7787778B2 (en) * 2004-12-10 2010-08-31 Ciena Corporation Control system for a polar optical transmitter
JP4234117B2 (ja) * 2005-07-07 2009-03-04 アンリツ株式会社 光変調器
JP4422661B2 (ja) 2005-08-31 2010-02-24 富士通株式会社 差動４位相偏移変調器の駆動電圧設定方法
JP4640082B2 (ja) 2005-09-29 2011-03-02 横河電機株式会社 光変調装置及び光変調器制御方法
US7898464B1 (en) 2006-04-11 2011-03-01 Lockheed Martin Corporation System and method for transmitting signals via photonic excitation of a transmitter array
JP2008046573A (ja) * 2006-08-21 2008-02-28 Fujitsu Ltd 光変調器
JP5405716B2 (ja) * 2006-09-29 2014-02-05 富士通株式会社 光送信機
CN101578544B (zh) * 2006-10-07 2012-12-05 斯欧普迪克尔股份有限公司 分段光调制器
US7529433B2 (en) * 2007-01-12 2009-05-05 Jds Uniphase Corporation Humidity tolerant electro-optic device
US7719752B2 (en) 2007-05-11 2010-05-18 Qualcomm Mems Technologies, Inc. MEMS structures, methods of fabricating MEMS components on separate substrates and assembly of same
US8401405B2 (en) * 2009-05-28 2013-03-19 Freedom Photonics, Llc. Monolithic widely-tunable coherent receiver
US9344196B1 (en) 2009-05-28 2016-05-17 Freedom Photonics, Llc. Integrated interferometric optical transmitter
JP5821250B2 (ja) * 2010-11-19 2015-11-24 富士通オプティカルコンポーネンツ株式会社 光変調装置および光変調制御方法
JP5853386B2 (ja) * 2010-12-16 2016-02-09 富士通オプティカルコンポーネンツ株式会社 光変調装置および光変調制御方法
US9817249B2 (en) * 2012-06-26 2017-11-14 Acacia Communications, Inc. Alternating traveling-wave Mach-Zehnder modulator
US8948608B1 (en) * 2012-09-27 2015-02-03 Inphi Corporation Direct-coupled driver for mach-zehnder optical modulators
JP6003687B2 (ja) * 2013-01-31 2016-10-05 富士通株式会社 光送信装置および変調光信号生成方法
US9804473B2 (en) * 2013-12-18 2017-10-31 Tektronix, Inc. High bandwidth and input impedance electro-optic probe
US10551641B1 (en) * 2013-12-20 2020-02-04 Inphi Corporation Method and system of a three-terminal driver for modulator devices
GB201408125D0 (en) * 2014-05-08 2014-06-25 Optasense Holdings Ltd Fibre optic distributed sensing
JP6330549B2 (ja) * 2014-07-25 2018-05-30 住友電気工業株式会社 光半導体素子およびその製造方法
JP6354553B2 (ja) * 2014-12-02 2018-07-11 住友電気工業株式会社 バイアス制御回路およびそれを含む光送信器
US10133142B2 (en) 2016-03-29 2018-11-20 Acacia Communications, Inc. Silicon modulators and related apparatus and methods
US10088733B2 (en) * 2016-08-08 2018-10-02 Acacia Communications, Inc. Segmented traveling wave optical modulators and related methods
US10320152B2 (en) 2017-03-28 2019-06-11 Freedom Photonics Llc Tunable laser
JP7091969B2 (ja) * 2018-09-25 2022-06-28 日本電信電話株式会社 光変調器モジュール
US11381316B2 (en) * 2018-10-30 2022-07-05 Nec Corporation Optical transmitter and optical transmission method

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6132814A (ja) * 1984-07-25 1986-02-15 Matsushita Electric Ind Co Ltd 方向性結合器型光機能素子
EP0235662B1 (fr) * 1986-02-17 1993-10-27 Nec Corporation Emetteur optique comportant un discriminateur optique de fréquence
US4893352A (en) * 1987-06-30 1990-01-09 Massachusetts Institute Of Technology Optical transmitter of modulated signals
US4871223A (en) * 1987-08-25 1989-10-03 Siemens Aktiengesellschaft Arrangement comprising at least one integrated optical waveguide on a substrate of electro-optical material and comprising at least one electrode
JPH01223837A (ja) * 1988-03-03 1989-09-06 Nec Corp 光多値送信機
JPH02165117A (ja) * 1988-12-20 1990-06-26 Fujitsu Ltd 導波路型光変調器の動作安定化方法
FR2642857B1 (fr) * 1988-12-23 1991-04-12 Thomson Csf Dispositif de traitement optoelectronique du signal, notamment pour le traitement de signaux en hyperfrequence
CA2011954C (fr) * 1989-03-14 1994-02-22 Hiroshi Hamano Modulateur optique
JP2658387B2 (ja) * 1989-04-28 1997-09-30 日本電気株式会社 光変調器とその駆動方法および光変調器駆動装置
US5170274A (en) * 1990-03-01 1992-12-08 Fujitsu Limited Optical transmitter
JP2642499B2 (ja) * 1990-03-01 1997-08-20 富士通株式会社 光送信器、光変調器の制御回路および光変調方法
JP2800368B2 (ja) * 1990-05-18 1998-09-21 富士通株式会社 光変調器
JPH0434516A (ja) * 1990-05-31 1992-02-05 Fujitsu Ltd 光変調器

Also Published As

Publication number Publication date
DE69221839D1 (de) 1997-10-02
CA2083219C (fr) 1999-01-05
DE69221839T2 (de) 1998-01-29
EP0725299A2 (fr) 1996-08-07
EP0547394A3 (en) 1993-09-01
EP0547394B1 (fr) 1997-08-27
EP0547394A2 (fr) 1993-06-23
EP0725299A3 (fr) 1996-10-23
US5359449A (en) 1994-10-25

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