CA2051325A1 - Systeme de communication optique - Google Patents

Systeme de communication optique

Info

Publication number
CA2051325A1
CA2051325A1 CA2051325A CA2051325A CA2051325A1 CA 2051325 A1 CA2051325 A1 CA 2051325A1 CA 2051325 A CA2051325 A CA 2051325A CA 2051325 A CA2051325 A CA 2051325A CA 2051325 A1 CA2051325 A1 CA 2051325A1
Authority
CA
Canada
Prior art keywords
signal
optical
modulated
transmission signals
band
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
CA2051325A
Other languages
English (en)
Other versions
CA2051325C (fr
Inventor
Shigeki Watanabe
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 JP2242615A external-priority patent/JP2838839B2/ja
Priority claimed from JP2282642A external-priority patent/JP2775692B2/ja
Application filed by Individual filed Critical Individual
Publication of CA2051325A1 publication Critical patent/CA2051325A1/fr
Application granted granted Critical
Publication of CA2051325C publication Critical patent/CA2051325C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0298—Wavelength-division multiplex systems with sub-carrier multiplexing [SCM]
    • 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
    • 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
    • H04B10/504—Laser transmitters using direct 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
    • 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
    • H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
    • 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
    • H04B10/506—Multiwavelength transmitters
    • 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
    • H04B10/572—Wavelength control

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
CA002051325A 1990-09-14 1991-09-13 Systeme de communication optique Expired - Fee Related CA2051325C (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2242615A JP2838839B2 (ja) 1990-09-14 1990-09-14 光通信方式
JP02-242615 1990-09-14
JP02-282642 1990-10-20
JP2282642A JP2775692B2 (ja) 1990-10-20 1990-10-20 光通信方式

Publications (2)

Publication Number Publication Date
CA2051325A1 true CA2051325A1 (fr) 1992-03-15
CA2051325C CA2051325C (fr) 1999-06-29

Family

ID=26535842

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002051325A Expired - Fee Related CA2051325C (fr) 1990-09-14 1991-09-13 Systeme de communication optique

Country Status (3)

Country Link
US (1) US5896211A (fr)
EP (4) EP0772312A3 (fr)
CA (1) CA2051325C (fr)

Families Citing this family (122)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748542B1 (fr) * 1994-02-28 2000-06-21 International Business Machines Corporation Procede et appareil de communications optiques sans cable
JP2556298B2 (ja) * 1994-06-21 1996-11-20 日本電気株式会社 サブキャリア多重光伝送システムにおける光送信器
US5847853A (en) * 1995-12-29 1998-12-08 Micron Technology, Inc. Modulation and demodulation of light to facilitate transmission of information
JP3003575B2 (ja) * 1996-06-28 2000-01-31 日本電気株式会社 サブキャリア多重信号の光伝送方法と光伝送装置
US5796502A (en) * 1997-01-06 1998-08-18 Haller, Jr.; John L. Multiple independent/dependent monochromatic light frequency fiber optic communication system and method
US6330090B1 (en) * 1997-02-14 2001-12-11 Photonetics Optical fiber wavelength, multiplexer and demultiplexer
US6249364B1 (en) * 1997-02-14 2001-06-19 Photonetics Optical wave-guide wavelength multiplexer and demultiplexer
US6459519B1 (en) * 1997-04-09 2002-10-01 Matsushita Electric Industrial Co., Ltd. Optical transmitter-receiver
US6101011A (en) * 1997-05-29 2000-08-08 Ciena Corporation Modulation format adjusting optical transponders
JP4184474B2 (ja) * 1997-08-22 2008-11-19 松下電器産業株式会社 光伝送システムならびにそれに用いられる光送信装置および光受信装置
JP3107027B2 (ja) * 1997-12-25 2000-11-06 日本電気株式会社 光部品特性測定システム
JP4057122B2 (ja) * 1998-01-16 2008-03-05 シャープ株式会社 ディジタル光通信信号の変調方法、光通信方法、及び光送信装置
US6529303B1 (en) * 1998-03-05 2003-03-04 Kestrel Solutions, Inc. Optical communications networks utilizing frequency division multiplexing
US6400478B1 (en) 1998-04-02 2002-06-04 Sorrento Networks, Inc. Wavelength-division-multiplexed optical transmission system with expanded bidirectional transmission capacity over a single fiber
DE19819213A1 (de) * 1998-04-29 1999-11-11 Siemens Ag Digitales Mehrteilnehmer-Funk-Nachrichtenübertragungssystem
US6181450B1 (en) * 1998-05-12 2001-01-30 Harris Corporation System and method for free space optical communications
US6362903B1 (en) * 1998-10-30 2002-03-26 Lockheed Martin Corporation Use of higher order modulation techniques to transmit information on passbands of a dispersion-limited fiber link
US6407837B1 (en) * 1998-11-25 2002-06-18 Lockheed Martin Corporation Use of bandwidth efficient modulation techniques in a wavelength division multiplexed optical link
US6590683B1 (en) * 1999-02-04 2003-07-08 Lockheed Martin Corporation Bandwidth efficient phase shift keyed modulation over nonlinear distortion limited optical fiber links
US6452707B1 (en) 1999-02-17 2002-09-17 Tycom (Us) Inc. Method and apparatus for improving spectral efficiency in fiber-optic communication systems
US6353490B1 (en) * 1999-05-12 2002-03-05 Quintech, Inc. C/N performance of broadband two-way transmission of RF signals over transmission mediums with limited bandwidth
JP2000323786A (ja) * 1999-05-14 2000-11-24 Fujitsu Ltd 信号光の波形整形のための方法、装置及びシステム
US6661973B1 (en) * 1999-06-04 2003-12-09 David R. Huber Optical transmission systems, apparatuses, and methods
US6850710B1 (en) * 2000-06-09 2005-02-01 Tip Group, Llc Method and apparatus of utilizing RF/microwave and optical mixing techniques to select a given band of an optical transmission
JP2003502902A (ja) * 1999-06-10 2003-01-21 ファイバースペイス，インコーポレーテッド 光伝送の所与の帯域を選択するための高周波／マイクロ波および光混合技術を使用するための方法および装置
US7088921B1 (en) * 1999-06-11 2006-08-08 Lucent Technologies Inc. System for operating an Ethernet data network over a passive optical network access system
US6341023B1 (en) * 1999-07-23 2002-01-22 Tycom (Us) Inc. Multiple level modulation in a wavelength-division multiplexing (WDM) systems
US7061657B1 (en) * 1999-10-12 2006-06-13 Futurewei Technologies, Inc. Multichannel optical communication system and method utilizing wavelength and coherence division multiplexing
US6879640B1 (en) * 1999-10-20 2005-04-12 Broadcom Corporation Method, apparatus and system for high-speed transmission on fiber optic channel
US20010021047A1 (en) * 1999-12-24 2001-09-13 Hiroyuki Sasai Optical transmission system and optical receiver
US7146103B2 (en) * 1999-12-29 2006-12-05 Forster Energy Llc Optical communications using multiplexed single sideband transmission and heterodyne detection
US7447436B2 (en) * 1999-12-29 2008-11-04 Forster Energy Llc Optical communications using multiplexed single sideband transmission and heterodyne detection
US7209660B1 (en) * 1999-12-29 2007-04-24 Forster Energy Llc Optical communications using heterodyne detection
US6763195B1 (en) * 2000-01-13 2004-07-13 Lightpointe Communications, Inc. Hybrid wireless optical and radio frequency communication link
DE50108910D1 (de) * 2000-03-04 2006-04-20 Thorlabs Gmbh Vorrichtung zur erfassung der pmd von optoelektronischen übertragungsstrecken
US6735398B1 (en) * 2000-03-15 2004-05-11 Hughes Electronics Corporation Generating methods for single and multi-channel wideband optical analog pulse positioned waveforms
US7286769B1 (en) * 2000-03-31 2007-10-23 Tellabs Bedford, Inc. Bidirectional frequency shift coding using two different codes for upstream and downstream
GB2361057B (en) * 2000-04-06 2002-06-26 Marconi Comm Ltd Optical signal monitor
US7228077B2 (en) * 2000-05-12 2007-06-05 Forster Energy Llc Channel gain control for an optical communications system utilizing frequency division multiplexing
US6895190B1 (en) * 2000-05-26 2005-05-17 Picolight, Incorporated Switchable bandwidth lowpass filter
US6889007B1 (en) * 2000-06-29 2005-05-03 Nortel Networks Limited Wavelength access server (WAS) architecture
JP2002026874A (ja) * 2000-07-07 2002-01-25 Matsushita Electric Ind Co Ltd 光通信装置
WO2002005463A1 (fr) * 2000-07-12 2002-01-17 Profile Optische Systeme Gmbh Moniteur pmd procede et dispositif permettant de determiner la dispersion modale de polarisation d'un systeme de transmission et en particulier d'une fibre de transmission
DE10049784A1 (de) * 2000-10-09 2002-05-16 Adalbert Bandemer Anordnung zur Kompensation PMD-bedingter Verzerrungen in optischen Transmissionssystemen und insbesondere Transmissionsfasern
AU2001280790A1 (en) * 2000-07-27 2002-02-13 John W Hicks Local access fiber optics communication system
WO2002013432A1 (fr) * 2000-08-03 2002-02-14 Lockheed Martin Corporation Transmission par decalage de phase avec correction d'erreur sans voie de retour et amplification raman dans des liaisons optiques a multiplexage par repartition en longueur d'onde (mrl)
WO2002015416A2 (fr) 2000-08-17 2002-02-21 Terabit Communications, L.L.C. Systeme de communications a vitesse elevee
US7076169B2 (en) * 2000-09-26 2006-07-11 Celight, Inc. System and method for orthogonal frequency division multiplexed optical communication
US7058316B2 (en) * 2000-11-28 2006-06-06 California Institute Of Technology Adaptive detector arrays for optical communications receivers
US6542287B1 (en) * 2000-12-12 2003-04-01 Onetta, Inc. Optical amplifier systems with transient control
GB2370473B (en) * 2000-12-21 2004-04-07 Marconi Caswell Ltd Improvements in or relating to optical communication
US6469816B1 (en) 2001-05-24 2002-10-22 Oyster Optics, Inc. Phase-modulated fiber optic telecommunications system
US6594055B2 (en) 2001-01-17 2003-07-15 Oyster Optics, Inc. Secure fiber optic telecommunications system and method
US6476952B1 (en) 2001-01-17 2002-11-05 Oyster Optics, Inc. Phase-modulated fiber optic telecommunications system
US6665500B2 (en) 2001-01-29 2003-12-16 Oyster Optics, Inc. Dual-mode fiber optic telecommunications system and method
US7099592B2 (en) 2001-02-02 2006-08-29 Oyster Optics, Inc. Telecommunications card for secure optical data transmission and installation method
US6823178B2 (en) * 2001-02-14 2004-11-23 Ydi Wireless, Inc. High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation
US20020122230A1 (en) * 2001-03-05 2002-09-05 Hossein Izadpanah Hybrid RF and optical wireless communication link and network structure incorporating it therein
US20020131121A1 (en) * 2001-03-13 2002-09-19 Muthu Jeganathan Transceiver, system, and method for free-space optical communication and tracking
US20020131125A1 (en) * 2001-03-16 2002-09-19 Myers Michael H. Replicated-spectrum photonic transceiving
US20020131100A1 (en) * 2001-03-16 2002-09-19 Myers Michael H. Method for photonic wavelength error detection
US20020131106A1 (en) * 2001-03-16 2002-09-19 Peter Snawerdt Secure wave-division multiplexing telecommunications system and method
US20020131107A1 (en) * 2001-03-16 2002-09-19 Hait John N. Hyper-dense photonic signal apparatus
US20020130251A1 (en) * 2001-03-16 2002-09-19 Myers Michael H. Photonic wavelength error detector
US6407846B1 (en) 2001-03-16 2002-06-18 All Optical Networks, Inc. Photonic wavelength shifting method
US6941078B1 (en) * 2001-05-10 2005-09-06 Fujitsu Limited Method and system for communicating a clock signal over an optical link
US7200344B1 (en) * 2001-05-10 2007-04-03 Fujitsu Limited Receiver and method for a multichannel optical communication system
US7035543B1 (en) * 2001-05-10 2006-04-25 Fujitsu Limited Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals
US7483639B2 (en) * 2001-05-10 2009-01-27 Fujitsu Limited Method and system for transmitting information in an optical communication system using distributed amplification
US6816260B2 (en) * 2001-05-17 2004-11-09 Thorlabs Gmbh Fiber polarimeter, the use thereof, as well as polarimetric method
US7495765B2 (en) * 2001-05-17 2009-02-24 Thorlabs Gmbh Fiber polarimeter, the use thereof, as well as polarimetric method
US6741139B2 (en) 2001-05-22 2004-05-25 Ydi Wirelesss, Inc. Optical to microwave converter using direct modulation phase shift keying
WO2002095991A2 (fr) * 2001-05-22 2002-11-28 Opticalis Ltd. Generation de sous-porteuses pour telecommunications optiques
US7409159B2 (en) 2001-06-29 2008-08-05 Hrl Laboratories, Llc Wireless wavelength division multiplexed system
US6778318B2 (en) * 2001-06-29 2004-08-17 Hrl Laboratories, Llc Optical-to-wireless WDM converter
US7620327B2 (en) * 2001-07-09 2009-11-17 Oyster Optics, Inc. Fiber optic telecommunications card with energy level monitoring
WO2003028252A1 (fr) * 2001-09-26 2003-04-03 Celight, Inc. Systeme et procede de communication optique multiplexee par repartition orthogonale de la frequence
WO2003105373A1 (fr) * 2002-06-10 2003-12-18 B.C.D. S.R.L. Procedes d'emission et de reception de signaux laser, ainsi que emetteur et recepteur pour realiser ces procedes
US20050231783A1 (en) * 2002-06-10 2005-10-20 Carluccio Panzeri Methods for transmitting and receiving laser signals, as well as transmitter and receiver which carry out said methods
US20040017785A1 (en) * 2002-07-16 2004-01-29 Zelst Allert Van System for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to/from a central processing base station
JP2004221968A (ja) * 2003-01-15 2004-08-05 Fujitsu Ltd 光伝送方式
CN1698298A (zh) * 2003-06-13 2005-11-16 松下电器产业株式会社 分频光学传输系统,和光学发送器件,光学接收器件,以及基于上述器件的光学传输的使用方法
CN1701542A (zh) * 2003-06-13 2005-11-23 松下电器产业株式会社 具有用于减少伪信号构件的增益控制的光传输系统
EP1646164B1 (fr) * 2003-07-11 2015-10-07 Nippon Telegraph And Telephone Corporation Emetteur de signaux optiques et systeme d'emission de signaux optiques
US20050074037A1 (en) * 2003-10-06 2005-04-07 Robin Rickard Optical sub-carrier multiplexed transmission
US7274872B2 (en) * 2004-03-12 2007-09-25 Futurewei Technologies, Inc. System and method for subcarrier modulation as supervisory channel
US7330657B2 (en) * 2004-04-01 2008-02-12 Bookham Technology Plc Method to demultiplex wavelengths of light
US7650081B2 (en) * 2004-05-26 2010-01-19 Alcatel-Lucent Usa Inc. Method and apparatus for receiving frequency modulated signals on an intensity modulated optical carrier
US7580630B2 (en) * 2004-06-07 2009-08-25 Nortel Networks Limited Spectral shaping for optical OFDM transmission
DE602004003488T2 (de) * 2004-07-13 2007-03-29 Alcatel Bandbegrenztes FSK Modulationsverfahren
US20060029398A1 (en) * 2004-08-06 2006-02-09 Li Liu Transmission of optical signals of different modulation formats in discrete bands
CA2609877C (fr) * 2005-01-25 2015-05-26 Tir Technology Lp Procede et dispositif d'eclairage et de communication
US7689132B2 (en) * 2005-06-07 2010-03-30 Industrial Technology Research Institute Interference-rejection coding method for an optical wireless communication system and the optical wireless communication system thereof
US7715727B2 (en) * 2005-08-01 2010-05-11 The United States Of America As Represented By The Secretary Of The Navy System and method for transmitting analog signals with a modulating retroreflector and hybrid amplitude and frequency modulation
US7826745B2 (en) * 2005-12-21 2010-11-02 International Business Machines Corporation Open fiber control and loss of light propagation in time division multiplexed inter-system channel link
US7787765B2 (en) * 2005-12-21 2010-08-31 International Business Machines Corporation Method and apparatus device for initializing an end-to-end link in a fiber optic communications system
US20070196113A1 (en) * 2006-02-09 2007-08-23 Fathimulla Ayub M Monolithic optically preamplified coherent photoreceiver arrays
KR100827171B1 (ko) * 2006-05-02 2008-05-02 삼성전자주식회사 부반송파 다중화 방식의 광 통신 방법과 그를 이용한 수동형 광 가입자 망
GB0610029D0 (en) * 2006-05-19 2006-06-28 Univ Cambridge Tech A method of and apparatus for combining electrical signals
JP2008004633A (ja) * 2006-06-20 2008-01-10 Nec Corp 光モジュール及び実装方法
US8824889B2 (en) * 2006-10-04 2014-09-02 Futurewei Technologies, Inc. High capacity optical frequency division multiple access passive optical network
EP2179521B1 (fr) * 2007-07-19 2016-09-07 Philips Lighting Holding B.V. Procede, systeme et dispositif de transmission de donnees de dispositif d'eclairage
US8009991B2 (en) * 2007-10-24 2011-08-30 Hewlett-Packard Development Company, L.P. Dynamic optical signal tracking on a detector array in a free space optical communication system
CN101459913B (zh) * 2007-12-12 2010-10-27 华为技术有限公司 无线通信系统、中心站、接入设备及通信方法
US8285147B2 (en) * 2008-07-31 2012-10-09 Lg-Ericsson Co., Ltd. Bulk modulation of multiple wavelengths for generation of CATV optical comb
JP5272863B2 (ja) * 2009-04-14 2013-08-28 ソニー株式会社 伝送装置、撮像装置及び伝送方法
WO2011052075A1 (fr) * 2009-10-30 2011-05-05 富士通株式会社 Dispositif de traitement de signal optique, récepteur, et système de réseau optique
JP5549333B2 (ja) * 2010-04-07 2014-07-16 富士通株式会社 偏波変動補償装置および光通信システム
GB2514073A (en) * 2010-09-09 2014-11-19 Univ Dublin City An optical measurement method and system
US20120243878A1 (en) * 2011-03-24 2012-09-27 Timothy Joseph Wurth Radio frequency and digital signal dual carrier mulitple modulation system
EP2721751B1 (fr) * 2011-06-20 2017-08-16 British Telecommunications Public Limited Company Réseau de communication
EP2538588A1 (fr) * 2011-06-20 2012-12-26 British Telecommunications Public Limited Company Réseau de communications
JP5924088B2 (ja) * 2012-04-06 2016-05-25 富士通株式会社 光伝送システム
US9485049B2 (en) * 2013-03-29 2016-11-01 Infinera Corporation Adjusting carrier spacing in a channel
US20150043918A1 (en) * 2013-08-09 2015-02-12 Arris Enterprises, Inc. Double Capacity Pluggable Optics
US10397190B2 (en) * 2016-02-05 2019-08-27 Huawei Technologies Co., Ltd. System and method for generating an obfuscated optical signal
CN108702208B (zh) * 2016-02-19 2020-07-24 华为技术有限公司 利用扩频导频音的光信道监测
CN110226297B (zh) 2017-02-01 2022-07-12 英国电讯有限公司 对光网络中的事件进行定位的方法、介质和光网络
JP7091617B2 (ja) * 2017-08-02 2022-06-28 富士通株式会社 光受信器、光伝送システム、及び受信処理方法
US20190107617A1 (en) * 2017-10-06 2019-04-11 Rf Venue, Inc. Diversity fin antenna
CN111492599A (zh) 2018-01-09 2020-08-04 英国电讯有限公司 光数据传输系统
GB202104000D0 (en) * 2021-03-23 2021-05-05 British Telecomm Improvements to network synchronisation

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046578B2 (ja) * 1977-11-18 1985-10-16 日本電気株式会社 光通信装置
JPS56144589A (en) * 1980-04-11 1981-11-10 Fujitsu Ltd Fm modulation system of semiconductor laser
JPS58206245A (ja) * 1982-05-27 1983-12-01 Kokusai Denshin Denwa Co Ltd <Kdd> 光波長分割多重方式
JPS6090483A (ja) * 1983-10-25 1985-05-21 Sumitomo Electric Ind Ltd 光送受信装置
US4722081A (en) * 1984-07-11 1988-01-26 Matsushita Electric Industrial Co., Ltd. Analog optical transmission system
JPH0626276B2 (ja) * 1985-01-14 1994-04-06 日本電気株式会社 レ−ザ光直接周波数変調方法
US4726644A (en) * 1985-07-08 1988-02-23 General Dynamics Electronics Division RF frequency multiplexed fiber optic data bus
JPS6229325A (ja) * 1985-07-30 1987-02-07 Sumitomo Electric Ind Ltd 光送受信装置
JPS6266732A (ja) * 1985-09-18 1987-03-26 Nec Corp 光周波数多重通信方法
JPS6281136A (ja) * 1985-10-03 1987-04-14 Nec Corp 波長多重光受信装置
US4701904A (en) * 1985-10-18 1987-10-20 American Telephone And Telegraph Company, At&T Bell Laboratories Optical local area network employing microwave modulation techniques
JPH0810848B2 (ja) * 1986-05-02 1996-01-31 日本電気株式会社 光送信器
JPS6410797A (en) 1987-07-02 1989-01-13 Nec Corp Light exchanging device
JP2858746B2 (ja) * 1987-10-26 1999-02-17 日本電気株式会社 光変調方法
CA1330242C (fr) * 1987-11-30 1994-06-14 Gte Laboratories Incorporated Systemes de transmission optiques multiplexes a sous-porteuses utilisant la selection des canaux optiques
JPH0236621A (ja) * 1988-07-27 1990-02-06 Fujitsu Ltd 偏波スクランブル光受信方式
US4893300A (en) * 1988-08-01 1990-01-09 American Telephone And Telegraph Company Technique for reducing distortion characteristics in fiber-optic links
JP2738542B2 (ja) * 1988-09-07 1998-04-08 富士通株式会社 コヒーレント光通信方式
US4941208A (en) * 1988-09-08 1990-07-10 Gte Laboratories Incorporated High performance subcarrier multiplexed optical communication system with modulation index exceeding unity
US4953156A (en) * 1988-09-08 1990-08-28 Gte Laboratories, Incorporated Wideband subcarrier multiplexed optical communication system operating over more than one octave
US5016242A (en) * 1988-11-01 1991-05-14 Gte Laboratories Incorporated Microwave subcarrier generation for fiber optic systems
US4989200A (en) * 1988-12-22 1991-01-29 Gte Laboratories Incorporated Coherent subcarrier multiplexed optical communication system
DE3907497A1 (de) * 1989-03-08 1990-09-13 Standard Elektrik Lorenz Ag Optisches nachrichtenuebertragungssystem fuer den teilnehmeranschlussbereich
DE3907495A1 (de) * 1989-03-08 1990-09-13 Standard Elektrik Lorenz Ag Optisches nachrichtenuebertragungssystem fuer den teilnehmeranschlussbereich
US5020049A (en) * 1989-10-13 1991-05-28 At&T Bell Laboratories Optical sub-carrier multiplex television transmission system using a linear laser diode
JPH1010797A (ja) * 1996-06-20 1998-01-16 Mitsubishi Heavy Ind Ltd 液体トナー用顔料組成物の製法

Also Published As

Publication number Publication date
EP0772314A2 (fr) 1997-05-07
EP0772312A3 (fr) 1997-09-03
EP0772313A3 (fr) 1997-09-03
US5896211A (en) 1999-04-20
EP0772314A3 (fr) 1997-09-03
EP0477699A2 (fr) 1992-04-01
EP0772313A2 (fr) 1997-05-07
EP0772312A2 (fr) 1997-05-07
CA2051325C (fr) 1999-06-29
EP0477699A3 (en) 1993-09-01

Similar Documents

Publication Publication Date Title
CA2051325A1 (fr) Systeme de communication optique
US4644526A (en) Full duplex frequency division multiplex communication system
CA2078076A1 (fr) Systeme de communication optique
JPS55163927A (en) Sound-band multiplex transmission system
GB1458273A (en) Microwave relay system
CA2027364A1 (fr) Detecteur de signaux numeriques a largeur de bande variable
CA2223982A1 (fr) Systeme, dispositif et procede de communication a utilisateurs multiples caracterises par des spectres de porteuses amont a recouvrement
EP0131818A3 (fr) Système optique multiplex à division de fréquence
EP0482943A2 (fr) Méthode de transmission optique bidirectionelle et appareil pour la mise en oeuvre
EP0356903A3 (fr) Sytème de transmission de télévision ayant une séparation modifiée des spectres audio et vidéo
EP0130692A3 (fr) Procédé et dispositif de multiplexage en temps et en fréquences de trois signaux de télévision
US4959827A (en) Laser signal mixer circuit
GB1449953A (en) Communications system and method for transmitting over a limited bandwidth transmission link
MY116925A (en) Apparatus for demodulating am data multiplexed modulated wave signal
CA1137661A (fr) Systeme de transmission audio a onde porteuse
ES8404593A1 (es) Aparato de television perfeccionado con varias vias de sonido.
SU1322353A1 (ru) Устройство дл передачи и приема сигналов
JPS6351613B2 (fr)
SU1283993A1 (ru) Система передачи телеграфных сигналов
SU725252A1 (ru) Способ передачи многоканальных сигналов с амплитудно-импульсной модул цией
JPS57174943A (en) Power line carrier device
JPS622849Y2 (fr)
JPS56160143A (en) Signal transmitter
JPS55147074A (en) Mutiplex method for color video signal
SU1584123A1 (ru) Замкнута телевизионна система

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed