IT1231379B - Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea - Google Patents

Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea

Info

Publication number
IT1231379B
IT1231379B IT8921258A IT2125889A IT1231379B IT 1231379 B IT1231379 B IT 1231379B IT 8921258 A IT8921258 A IT 8921258A IT 2125889 A IT2125889 A IT 2125889A IT 1231379 B IT1231379 B IT 1231379B
Authority
IT
Italy
Prior art keywords
amplifiers
line
optical fiber
fiber optic
transmitted signal
Prior art date
Application number
IT8921258A
Other languages
English (en)
Other versions
IT8921258A0 (it
Inventor
Giorgio Grasso
Aldo Righetti
Flavio Fontana
Original Assignee
Pirelli Cavi Spa
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 Pirelli Cavi Spa filed Critical Pirelli Cavi Spa
Publication of IT8921258A0 publication Critical patent/IT8921258A0/it
Priority to IT8921258A priority Critical patent/IT1231379B/it
Priority to AT90111453T priority patent/ATE150920T1/de
Priority to ES90111453T priority patent/ES2102356T3/es
Priority to DE69033678T priority patent/DE69033678T2/de
Priority to AT96201234T priority patent/ATE198394T1/de
Priority to EP90111453A priority patent/EP0408905B1/en
Priority to ES96201234T priority patent/ES2154780T3/es
Priority to DE69030285T priority patent/DE69030285T2/de
Priority to EP96201234A priority patent/EP0742650B1/en
Priority to NZ234255A priority patent/NZ234255A/en
Priority to AU58029/90A priority patent/AU622597B2/en
Priority to PE1990172303A priority patent/PE34690A1/es
Priority to CS903573A priority patent/CS277497B6/cs
Priority to AR90317408A priority patent/AR243711A1/es
Priority to PL90286131A priority patent/PL164809B1/pl
Priority to DD90342927A priority patent/DD299205A5/de
Priority to FI903681A priority patent/FI903681A0/fi
Priority to HU904558A priority patent/HU211280B/hu
Priority to CA002021706A priority patent/CA2021706C/en
Priority to BR909003652A priority patent/BR9003652A/pt
Priority to KR1019900011013A priority patent/KR0155371B1/ko
Priority to CN90104750A priority patent/CN1022531C/zh
Priority to NO903260A priority patent/NO303998B1/no
Priority to US07/555,941 priority patent/US5054876A/en
Priority to IE265490A priority patent/IE79238B1/en
Priority to PT94781A priority patent/PT94781B/pt
Priority to JP19378490A priority patent/JP3031480B2/ja
Application granted granted Critical
Publication of IT1231379B publication Critical patent/IT1231379B/it
Priority to IDP97388191A priority patent/ID18627A/id
Priority to HK97101938A priority patent/HK1000358A1/xx
Priority to NO982208A priority patent/NO982208D0/no
Priority to JP11120663A priority patent/JP3113244B2/ja
Priority to JP2000187856A priority patent/JP2001044939A/ja

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
    • H04B10/29—Repeaters
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2931—Signal power control using AGC
    • 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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0775—Performance monitoring and measurement of transmission parameters
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0777—Monitoring line amplifier or line repeater equipment
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/09408—Pump redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/071—Monitoring an optical transmission system using a supervisory signal using alarms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/074—Monitoring an optical transmission system using a supervisory signal using a superposed, over-modulated signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/075—Monitoring an optical transmission system using a supervisory signal using a pilot tone
IT8921258A 1989-07-21 1989-07-21 Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea IT1231379B (it)

Priority Applications (32)

Application Number Priority Date Filing Date Title
IT8921258A IT1231379B (it) 1989-07-21 1989-07-21 Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea
ES96201234T ES2154780T3 (es) 1989-07-21 1990-06-18 Procedimiento para la emision de una señal optica de alarma.
EP96201234A EP0742650B1 (en) 1989-07-21 1990-06-18 Method for emitting an alarm optical signal
DE69033678T DE69033678T2 (de) 1989-07-21 1990-06-18 Verfahren zur Übertragung eines optischen Alarmsignals
AT96201234T ATE198394T1 (de) 1989-07-21 1990-06-18 Verfahren zur übertragung eines optischen alarmsignals
EP90111453A EP0408905B1 (en) 1989-07-21 1990-06-18 Optical fiber telecommunication line comprising amplifiers of the transmitted signals and amplifiers for said line
AT90111453T ATE150920T1 (de) 1989-07-21 1990-06-18 Lichtwellenleiternachrichtenübertragungsleitung mit verstärker für die übertragenen signale und verstärker für diese leitung
DE69030285T DE69030285T2 (de) 1989-07-21 1990-06-18 Lichtwellenleiternachrichtenübertragungsleitung mit Verstärker für die übertragenen Signale und Verstärker für diese Leitung
ES90111453T ES2102356T3 (es) 1989-07-21 1990-06-18 Linea de telecomunicaciones con fibra optica que comprende amplificadores de las señales transmitidas y amplificadores para dicha linea.
NZ234255A NZ234255A (en) 1989-07-21 1990-06-26 Optically pumped amplifier for fibre optic telecommunication line
AU58029/90A AU622597B2 (en) 1989-07-21 1990-06-29 Optical fiber telecommunication line comprising amplifiers of the transmitted signals and amplifiers for said line
PE1990172303A PE34690A1 (es) 1989-07-21 1990-07-17 Linea para telecomunicaciones con fibras opticas, comprendiendo amplificadores para dicha linea
CS903573A CS277497B6 (en) 1989-07-21 1990-07-18 Optical telecommunication line
AR90317408A AR243711A1 (es) 1989-07-21 1990-07-19 Una linea de telecomunicaciones de fibras opticas.
PL90286131A PL164809B1 (pl) 1989-07-21 1990-07-19 Wzmacniacz dla telekomunikacyjnego lacza optycznego PL PL PL
DD90342927A DD299205A5 (de) 1989-07-21 1990-07-19 Faseroptische fernmeldeleitung und verstaerker fuer diese leitung
FI903681A FI903681A0 (fi) 1989-07-21 1990-07-20 Optisk fiber foer telekommunikation omfattande foerstaerkare foer utgaoende signaler och foerstaerkare foer telekommunikationslinjen.
PT94781A PT94781B (pt) 1989-07-21 1990-07-20 Cabo de fibra optica de telecomunicacao compreendendo amplificadores dos sinaistransmitidos e amplificadores para o dito cabo
CA002021706A CA2021706C (en) 1989-07-21 1990-07-20 Optical fiber telecommunication line including amplifiers distributed along the line for the transmitted signals
BR909003652A BR9003652A (pt) 1989-07-21 1990-07-20 Linha de telecomunicacoes por fibras oticas incorporando amplificadores dos sinais transmitidos e amplificadores para dita linha
KR1019900011013A KR0155371B1 (ko) 1989-07-21 1990-07-20 전송신호를 증폭하는 증폭기를 포함하고 광섬유를 이용하는 원격통신회선 및 그러한 원격통신회선용 증폭기
CN90104750A CN1022531C (zh) 1989-07-21 1990-07-20 含信号放大器和线路放大器通信线路
NO903260A NO303998B1 (no) 1989-07-21 1990-07-20 Forsterker for fiberoptiske telekommunikasjonsledninger, og fiberoptisk telekommunikasjonsledning som inneholder en slik forsterker
US07/555,941 US5054876A (en) 1989-07-21 1990-07-20 Optical fiber telecommunication line including amplifiers distributed along the line for the transmitted signals
IE265490A IE79238B1 (en) 1989-07-21 1990-07-20 Optical fiber telecommunication line comprising amplifiers of the transmitted signals and amplifiers for said line
HU904558A HU211280B (en) 1989-07-21 1990-07-20 Optical telecommunication line, as well as amplifier to the optical telecommunication line
JP19378490A JP3031480B2 (ja) 1989-07-21 1990-07-21 送信信号の増幅器を含む光ファイバ通信回線及び該回線のための増幅器
IDP97388191A ID18627A (id) 1989-07-21 1997-09-07 Penyempurnaan dalam jalur-jalur telekomunikasi dengan serat optik (pecahan dari p-000227)
HK97101938A HK1000358A1 (en) 1989-07-21 1997-10-16 Optical fiber telecommunication line comprising amplifiers of the transmitted signals and amplifiers for said line
NO982208A NO982208D0 (no) 1989-07-21 1998-05-14 FremgangsmÕte og kretsanordning for utsendelse av et alarmsignal pÕ en optisk ledning
JP11120663A JP3113244B2 (ja) 1989-07-21 1999-04-27 光ファイバ通信線内で低周波信号を伝送する方法、及び光増幅器において低周波変調を検出する方法並びに光増幅器
JP2000187856A JP2001044939A (ja) 1989-07-21 2000-06-22 ポンピング光放射源により発生したポンピング光放射を光増幅器の活性コア光ファイバに供給する方法、及び光通信回線用の増幅器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8921258A IT1231379B (it) 1989-07-21 1989-07-21 Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea

Publications (2)

Publication Number Publication Date
IT8921258A0 IT8921258A0 (it) 1989-07-21
IT1231379B true IT1231379B (it) 1991-12-02

Family

ID=11179153

Family Applications (1)

Application Number Title Priority Date Filing Date
IT8921258A IT1231379B (it) 1989-07-21 1989-07-21 Linea di telecomunicazioni a fibre ottiche incorporante amplificatori dei segnali trasmessi ed amplificatori per detta linea

Country Status (25)

Country Link
US (1) US5054876A (it)
EP (2) EP0408905B1 (it)
JP (3) JP3031480B2 (it)
KR (1) KR0155371B1 (it)
CN (1) CN1022531C (it)
AR (1) AR243711A1 (it)
AT (2) ATE150920T1 (it)
AU (1) AU622597B2 (it)
BR (1) BR9003652A (it)
CA (1) CA2021706C (it)
CS (1) CS277497B6 (it)
DD (1) DD299205A5 (it)
DE (2) DE69033678T2 (it)
ES (2) ES2102356T3 (it)
FI (1) FI903681A0 (it)
HK (1) HK1000358A1 (it)
HU (1) HU211280B (it)
ID (1) ID18627A (it)
IE (1) IE79238B1 (it)
IT (1) IT1231379B (it)
NO (2) NO303998B1 (it)
NZ (1) NZ234255A (it)
PE (1) PE34690A1 (it)
PL (1) PL164809B1 (it)
PT (1) PT94781B (it)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3137632B2 (ja) * 1989-08-31 2001-02-26 富士通株式会社 光ファイバ増幅器を備えた光通信方式
GB8928237D0 (en) * 1989-12-14 1990-02-21 British Telecomm Lossless optical component
GB2251148B (en) * 1990-09-18 1995-04-12 Fujitsu Ltd Optical repeater having loop-back function
JPH04217123A (ja) * 1990-12-18 1992-08-07 Fujitsu Ltd 光伝送システムの給電方式
US5499135A (en) * 1990-12-24 1996-03-12 Alcatel N.V. Optical amplifier
DE4106778A1 (de) * 1991-03-04 1992-09-10 Standard Elektrik Lorenz Ag Optisch-elektrisch-wandler mit erweitertem dynamikbereich
US5268786A (en) * 1991-03-15 1993-12-07 Mitsubishi Denki Kabushiki Kaisha Optical fiber amplifier and its amplification method
IT1247844B (it) * 1991-03-29 1995-01-02 Pirelli Cavi S P A Dir Proprie Linea di telecomunicazione a fibre ottiche con amplificatori ottici, dotata di mezzi di protezione in grado di interrompere l'emissione luminosa in tutta la linea in presenza di un'interruzione della fibra ottica e di riattivarla automaticamente al ripristino della sua continuita'
JP2806092B2 (ja) * 1991-08-28 1998-09-30 日本電気株式会社 光増幅器
JP2725109B2 (ja) * 1992-03-06 1998-03-09 富士通株式会社 光増幅装置
DE4215338A1 (de) * 1992-05-09 1993-11-11 Sel Alcatel Ag Optisches Nachrichtenübertragungssystem mit Überwachungsvorrichtung zur Vermeidung von Riesenimpulsen
DE4218779C2 (de) * 1992-06-06 1997-04-03 Heinrich Zehnder Gmbh Vorrichtung zur optischen Informationsübertragung zwischen mehreren miteinander zu verbindenden Geräten
DE4222270B4 (de) * 1992-07-07 2007-09-13 Ericsson Ab Optische Verstärkerschaltung
US5278404A (en) * 1992-07-20 1994-01-11 At&T Bell Laboratories Optical sub-system utilizing an embedded micro-controller
US5241414A (en) * 1992-08-21 1993-08-31 At&T Bell Laboratories Fault tolerant optical amplifier arrangement
DE4315846A1 (de) * 1993-03-30 1994-10-06 Sel Alcatel Ag Faseroptischer Verstärker
JPH0816761B2 (ja) * 1993-04-13 1996-02-21 日本電気株式会社 光増幅器制御回路
US5408356A (en) * 1993-08-02 1995-04-18 The United States Of America As Represented By The United States Department Of Energy Fiber optic signal amplifier using thermoelectric power generation
JPH07176813A (ja) * 1993-12-17 1995-07-14 Fujitsu Ltd 光ファイバ増幅器
CN1055584C (zh) * 1994-12-27 2000-08-16 西安电子科技大学 双层微带线光导超短电脉冲产生器
JP3306693B2 (ja) * 1995-01-19 2002-07-24 富士通株式会社 光増幅装置，光波長多重通信システム，光端局装置及び光中継装置
US5563731A (en) * 1995-02-22 1996-10-08 Nec Corporation Monitor control signal receiving apparatus for optical fiber amplifier
US5532864A (en) * 1995-06-01 1996-07-02 Ciena Corporation Optical monitoring channel for wavelength division multiplexed optical communication system
US5710846A (en) * 1996-03-26 1998-01-20 Rf Systems, Inc. Self-calibrating optical fiber switch
US6580530B1 (en) 1998-05-29 2003-06-17 Cisco Photonics Italy S.R.L. Optical communication system
JP4576756B2 (ja) * 2001-06-19 2010-11-10 株式会社日立製作所 光信号切替え装置、および、その使用方法
DE10303314A1 (de) * 2003-01-28 2004-07-29 Marconi Communications Gmbh Ausgangsstufe für die WDM-Nachrichtenübertragung und Verfahren zum Austauschen von Fülllichtquellen in einer solchen Ausgangsstufe
US7158289B1 (en) 2003-11-07 2007-01-02 Alcatel Method and apparatus for implementing optical supervisory channel using broadband noise modulation
US7667889B2 (en) * 2007-02-21 2010-02-23 Pyrophotonics Lasers Inc. Methods and systems for gain control in pulsed optical amplifiers
JP5050931B2 (ja) 2008-03-04 2012-10-17 日本電気株式会社 光伝送システム、光伝送システムで用いられる光送受信装置、及び端末側送受信装置、並びに光伝送方法
JP2010177346A (ja) * 2009-01-28 2010-08-12 Nippon Telegr & Teleph Corp <Ntt> 光増幅器及び光増幅方法
US8964801B2 (en) * 2009-06-11 2015-02-24 Esi-Pyrophotonics Lasers, Inc. Method and system for stable and tunable high power pulsed laser system
KR101945622B1 (ko) 2017-06-29 2019-04-17 동서대학교 산학협력단 자율보행보조기 동작방법
EP3763064A1 (en) * 2018-03-06 2021-01-13 Neptune Subsea IP Limited Improved repeater powering

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3317541A1 (de) * 1983-05-13 1984-11-15 Siemens AG, 1000 Berlin und 8000 München Koppeleinrichtung fuer einen lichtwellenleiter
SE438396B (sv) * 1983-09-01 1985-04-15 Ericsson Telefon Ab L M Anordning for att detektera avtappning av ljusenergi fran optiska fibrer
GB2152297B (en) * 1984-01-19 1988-10-19 Stc Plc Optical repeaters
JPS6175326A (ja) * 1984-09-21 1986-04-17 Nec Corp フアイバ内光増幅送信装置
US4815804A (en) * 1985-02-08 1989-03-28 The Board Of Trustees Of The Leland Stanford Junior University In-line fiber optic memory and method of using same
US4699452A (en) * 1985-10-28 1987-10-13 American Telephone And Telegraph Company, At&T Bell Laboratories Optical communications system comprising Raman amplification means
DD246214A1 (de) * 1986-02-21 1987-05-27 Mikroelektronik Zt Forsch Tech Verfahren zur organisation des datenverkehrs lichtleitergekoppelter und mikrorechnergesteuerter technologischer module
GB8612955D0 (en) * 1986-05-28 1986-07-02 British Telecomm Optically controlled selector
GB8708148D0 (en) * 1987-04-06 1987-05-13 British Telecomm Radiation pulse generation
DE3885389T2 (de) * 1987-09-01 1994-03-24 Nec Corp Optischer Zwischenverstärker.

Also Published As

Publication number Publication date
HK1000358A1 (en) 1998-03-06
IE79238B1 (en) 1998-04-22
KR0155371B1 (ko) 1998-11-16
PT94781B (pt) 1998-04-30
ATE198394T1 (de) 2001-01-15
AR243711A1 (es) 1993-08-31
NO982208D0 (no) 1998-05-14
ES2102356T3 (es) 1997-08-01
NO903260L (no) 1991-01-22
DE69033678T2 (de) 2001-05-23
HU211280B (en) 1995-11-28
US5054876A (en) 1991-10-08
KR910003417A (ko) 1991-02-27
PL164809B1 (pl) 1994-10-31
NO982208L (no) 1991-01-22
NO303998B1 (no) 1998-10-05
EP0408905A3 (en) 1992-07-08
HUT54262A (en) 1991-01-28
CN1022531C (zh) 1993-10-20
BR9003652A (pt) 1991-08-27
CN1058500A (zh) 1992-02-05
PL286131A1 (en) 1991-04-08
DE69030285D1 (de) 1997-04-30
HU904558D0 (en) 1990-12-28
CA2021706C (en) 1995-11-21
JPH0383427A (ja) 1991-04-09
IE902654A1 (en) 1991-02-27
PT94781A (pt) 1992-03-31
ID18627A (id) 1998-04-30
CZ357390A3 (en) 1993-02-17
JP3113244B2 (ja) 2000-11-27
EP0408905B1 (en) 1997-03-26
ES2154780T3 (es) 2001-04-16
NZ234255A (en) 1992-11-25
DE69030285T2 (de) 1997-10-09
DE69033678D1 (de) 2001-02-01
EP0742650A1 (en) 1996-11-13
EP0742650B1 (en) 2000-12-27
FI903681A0 (fi) 1990-07-20
JP2001044939A (ja) 2001-02-16
IT8921258A0 (it) 1989-07-21
JP2000004200A (ja) 2000-01-07
CA2021706A1 (en) 1991-01-22
PE34690A1 (es) 1991-01-16
EP0408905A2 (en) 1991-01-23
AU622597B2 (en) 1992-04-09
CS277497B6 (en) 1993-03-17
DD299205A5 (de) 1992-04-02
JP3031480B2 (ja) 2000-04-10
AU5802990A (en) 1991-01-24
ATE150920T1 (de) 1997-04-15
NO903260D0 (no) 1990-07-20

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