WO1986007221A1 - Instrument repetiteur pour fibres optiques - Google Patents

Instrument repetiteur pour fibres optiques Download PDF

Info

Publication number
WO1986007221A1
WO1986007221A1 PCT/GB1986/000279 GB8600279W WO8607221A1 WO 1986007221 A1 WO1986007221 A1 WO 1986007221A1 GB 8600279 W GB8600279 W GB 8600279W WO 8607221 A1 WO8607221 A1 WO 8607221A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
link
transmission line
fibre optic
optical
Prior art date
Application number
PCT/GB1986/000279
Other languages
English (en)
Inventor
Anthony Lovell Raven
Original Assignee
Pa Consulting Services Limited
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 Pa Consulting Services Limited filed Critical Pa Consulting Services Limited
Publication of WO1986007221A1 publication Critical patent/WO1986007221A1/fr

Links

Classifications

    • 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
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/0933—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of a semiconductor, e.g. light emitting diode
    • 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

Definitions

  • This invention concerns fibre optic communication systems and in particular to methods and apparatus for reducing transmission losses in such systems.
  • Optical fibre communications systems normally operate at 1.3um (minimum dispersion) and 1.55um (minimum attenuation) wavelengths using semiconductor laser sources. Fibre losses are overcome by using electronic amplifier/repeater units at intervals along the transmission lines, typically at distances of 10 to 100 Kms.
  • a repeater amplifier for a fibre optic transmission system comprises:
  • a first fibre optic coupling means for receiving light from an optical fibre transmission line
  • a length of fibre optic transmission line comprising an optical link for transmitting light from the first coupling means to the second coupling means, the optical fibre forming the said link being doped with a rare-earth such as Neodymium or Erbium, and or LED (4) a diode laser ⁇ coupled to the fibre link to activate same and provide a positive gain in light level between the input coupling means and the output coupling means.
  • a rare-earth such as Neodymium or Erbium
  • the invention thus lies in the use of a rare-earth doped 5 glass or crystalline fibre where the rare-earth is selected to provide gain at either 1.3 - 1.4um (achieved using Neodynium) or 1.5 - 1.6um (achieved using Erbium). or LED
  • the diode laserk operates at a wavelength in the range 700 to 900 nm if Neodymium is the dopant and 800 to 1000 nm if Erbium is used with Neodymium and Ytterbi sensitizers.
  • the diode laser is coupled to the link by means of a dichroic beam splitter.
  • the diode laser may be coupled by means of a grating or wavelength multiplexer.
  • the invention also lies in an improved optical fibre 15 communication system which incorporates repeater amplifiers constructed in accordance with the invention at intervals along the length of the optical fibre transmission line.
  • an improved 20 fibre optic transmission line comprises a length of optical fibre doped throughout its length with Neodymium or Erbium to an amount just sufficient to cancel out the line losses so that a light signal provided at one end of the line will travel the length of the line without 25 noticeable attenuation.
  • the advantage of the invention is optimised by employing a carrier for the light signals of 1.318 microns wavelength in the case of Neodymium doping and 1.54 microns wavelength in the case of Erbium doping.
  • Fig 1 illustrates one embodiment of the present invention
  • Fig 2 illustrates a second embodiment of the invention
  • Fig 3 illustrates an improved optical fibre communication system employing repeater amplifiers of the invention.
  • Fig 1 an input fibre is shown at 10 coupling to a Neodynium doped length of fibre 12 via an optical coupler 14.
  • a lens 16 couples the output of the doped fibre to a dichroic beamsplitter 18 which is supplied with light at a wavelength in the range 0.7 to 0.9um (700 to 900nm) from a diode laser source 20, light from which is coupled to the beamsplitter via a lens 22.
  • the output from the diochroic beamsplitter is coupled via a third lens 24 to a second fibre cable 26.
  • Fig 2 an alternative arrangement is shown in which the dichroic beamsplitter is replaced by a grating 28.
  • the light from the diode laser source 20 is coupled as before through a lens 22, positioned now at an angle to the axis of the lens 16 which is much less than the 90° angle of the Fig 1 embodiment, and the output fibre 26 axis and its associated coupling lens 24 are likewise positioned off- axis by an angle sufficient to capture the diffracted light from the grating.
  • a fibre optic communication system comprising a modulated light source and light sensitive receptor 30 serving as a transmitter/receiver and a second similar unit 32 distant therefrom and joined thereto through the intermediary of a number of lengths of optical fibre 34,36,38 etc.connected in series and at each junction coupled the one to the other through a repeater amplifier 40,42 etc., each of which is constructed in the manner shown in Fig 1.
  • some or all of the repeater amplifiers may be dispensed with by using rare-earth doped optical fibres for the transmission line, typically Neodym ium or Erbium doped glass fires.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

Amplificateur répétiteur dans lequel un laser à diode (20) ou une diode électro-luminescente sont couplés à un lien de fibre afin d'activer ce dernier et afin d'obtenir un gain positif, le lien comprenant une certaine longueur (12) de la ligne de transmission de la fibre optique dopée au néodyme ou à l'erbium. La présente invention se rapporte également à une ligne de transmission améliorée, dans laquelle la ligne est efficacement formée en tant qu'amplificateur répétiteur continu par dopage de la ligne de la fibre optique avec une quantité de néodyme ou d'erbium à peine suffisante pour effacer les pertes de ligne des signaux optiques transmis le long de ladite ligne. Les longueurs d'ondes de fonctionnement typique du laser à diode sont de 700 à 900nm. Un des avantages trouvés à la présente inventon consiste à employer un support pour des signaux de lumière de 1,318 microns pour le dopage au néodyme et de 1,54 microns pour le dopage à l'erbium.
PCT/GB1986/000279 1985-05-22 1986-05-22 Instrument repetiteur pour fibres optiques WO1986007221A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8512980 1985-05-22
GB858512980A GB8512980D0 (en) 1985-05-22 1985-05-22 Fibre optic transmissions systems

Publications (1)

Publication Number Publication Date
WO1986007221A1 true WO1986007221A1 (fr) 1986-12-04

Family

ID=10579535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1986/000279 WO1986007221A1 (fr) 1985-05-22 1986-05-22 Instrument repetiteur pour fibres optiques

Country Status (3)

Country Link
EP (1) EP0222866A1 (fr)
GB (3) GB8512980D0 (fr)
WO (1) WO1986007221A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990000320A1 (fr) * 1988-07-04 1990-01-11 Phased Array Lasers Pty Ltd Oscillateur laser a reseau pilote en phase, a faisceau de fibres en boucle et a pompage par la face terminale
EP0409012A1 (fr) * 1989-07-17 1991-01-23 PIRELLI CAVI S.p.A. Elément d'amplification des signaux de lumière dans des lignes de transmissions à fibres optiques
WO1991005380A1 (fr) * 1989-09-26 1991-04-18 Australian Electro Optics Pty. Ltd. Oscillateur laser verrouille en phase a faisceau plie de fibres laser
WO1991009475A1 (fr) * 1989-12-14 1991-06-27 British Telecommunications Public Limited Company Composant optique sans perte
EP0485101A2 (fr) * 1990-11-09 1992-05-13 Nortel Networks Corporation Systèmes à fibres optiques amplifiés
DE4038503A1 (de) * 1990-12-03 1992-06-04 Kommunikations Elektronik Vorrichtung zum verbinden von zwei optischen fasern
EP0492850A2 (fr) * 1990-12-20 1992-07-01 AT&T Corp. Coupleur optique avec isolateur optique
AU629844B2 (en) * 1988-07-04 1992-10-15 Phased Array Lasers Pty. Ltd. End pumped, looped fibre bundle, phased array laser oscillator/amplifier
US5204923A (en) * 1989-07-17 1993-04-20 Pirelli Cavi S.P.A. Unit for amplifying light signals in optical fiber transmission lines
US5282079A (en) * 1988-06-10 1994-01-25 Pirelli General Plc Optical fibre amplifier
US5448663A (en) * 1989-09-01 1995-09-05 British Telecommunications Public Limited Company Optical coupler
USRE35697E (en) * 1990-07-16 1997-12-23 Pirelli Cavi S.P.A. Unit for amplifying light signals in optical fiber transmission lines
US8923511B2 (en) 1997-04-23 2014-12-30 Sony Corporation Enciphering apparatus and method, deciphering apparatus and method as well as information processing apparatus and method

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2231169A (en) * 1989-04-27 1990-11-07 Stc Plc Optical fibres
GB2231168A (en) * 1989-04-27 1990-11-07 Stc Plc Optical fibres
WO1990015980A1 (fr) * 1989-06-22 1990-12-27 British Telecommunications Public Limited Company Reflectometrie optique a domaine temps
CA2019253C (fr) * 1989-06-23 1994-01-11 Shinya Inagaki Amplificateur pour fibres optiques
US5185814A (en) * 1989-07-13 1993-02-09 British Telecommunications Public Limited Company Optical fiber communications network including plural amplifiers with single pump source
KR940001043B1 (ko) * 1989-07-20 1994-02-08 스미도모덴기고오교오 가부시기가이샤 파이버형 광증폭기
US5058974A (en) * 1989-10-06 1991-10-22 At&T Bell Laboratories Distributed amplification for lightwave transmission system
US5343286A (en) * 1990-02-15 1994-08-30 British Telecommunications Public Limited Company OTDR having optically switched amplified output onto test fibre to suppress optical amplifier noise between OTDR pluses
DE69222912T2 (de) * 1991-08-29 1998-04-09 Nec Corp Lichtempfangsmodul
JP2808972B2 (ja) * 1992-02-27 1998-10-08 日本電気株式会社 光増幅装置
JP3284507B2 (ja) * 1993-06-28 2002-05-20 富士通株式会社 光通信システム用の光送信装置及び光増幅装置
JPH08304664A (ja) * 1995-05-09 1996-11-22 Furukawa Electric Co Ltd:The 波長分波素子
DE19517952A1 (de) * 1995-05-16 1996-11-21 Ams Optotech Vertrieb Gmbh Optischer Verstärker mit Praseodym-dotierter optischer Faser
FR2769992B1 (fr) * 1997-10-21 2000-01-28 Thomson Csf Dispositif optique a modulation de polarisation pour la mesure de distance et/ou de vitesse d'objet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344970A (fr) * 1961-10-27 1963-12-06 American Optical Corp Appareils générateurs et amplificateurs d'énergie lumineuse
FR2012446A1 (fr) * 1968-07-06 1970-03-20 Nippon Selfoc Co Ltd
US3571737A (en) * 1968-06-07 1971-03-23 Bell Telephone Labor Inc Transmission line
US3950707A (en) * 1973-04-13 1976-04-13 Canadian Patents And Development Limited Quantum amplifier having passive core and active cladding providing signal gain by interaction of evanescent-wave components of signal and pump beams propagating along the core

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344970A (fr) * 1961-10-27 1963-12-06 American Optical Corp Appareils générateurs et amplificateurs d'énergie lumineuse
US3571737A (en) * 1968-06-07 1971-03-23 Bell Telephone Labor Inc Transmission line
FR2012446A1 (fr) * 1968-07-06 1970-03-20 Nippon Selfoc Co Ltd
US3950707A (en) * 1973-04-13 1976-04-13 Canadian Patents And Development Limited Quantum amplifier having passive core and active cladding providing signal gain by interaction of evanescent-wave components of signal and pump beams propagating along the core

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Proceedings of the IEEE, Volume 54, No. 10, October 1966, New York, (US) E. SNITZER "Glass Lasers", pages 1249-1261, see page 1250, Table 1 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282079A (en) * 1988-06-10 1994-01-25 Pirelli General Plc Optical fibre amplifier
WO1990000320A1 (fr) * 1988-07-04 1990-01-11 Phased Array Lasers Pty Ltd Oscillateur laser a reseau pilote en phase, a faisceau de fibres en boucle et a pompage par la face terminale
AU629844B2 (en) * 1988-07-04 1992-10-15 Phased Array Lasers Pty. Ltd. End pumped, looped fibre bundle, phased array laser oscillator/amplifier
US5204923A (en) * 1989-07-17 1993-04-20 Pirelli Cavi S.P.A. Unit for amplifying light signals in optical fiber transmission lines
EP0409012A1 (fr) * 1989-07-17 1991-01-23 PIRELLI CAVI S.p.A. Elément d'amplification des signaux de lumière dans des lignes de transmissions à fibres optiques
US5448663A (en) * 1989-09-01 1995-09-05 British Telecommunications Public Limited Company Optical coupler
WO1991005380A1 (fr) * 1989-09-26 1991-04-18 Australian Electro Optics Pty. Ltd. Oscillateur laser verrouille en phase a faisceau plie de fibres laser
WO1991009475A1 (fr) * 1989-12-14 1991-06-27 British Telecommunications Public Limited Company Composant optique sans perte
US5323474A (en) * 1989-12-14 1994-06-21 British Telecommunications Plc Lossless optical signal splitter including remotely pumped amplifier
USRE35697E (en) * 1990-07-16 1997-12-23 Pirelli Cavi S.P.A. Unit for amplifying light signals in optical fiber transmission lines
EP0485101A2 (fr) * 1990-11-09 1992-05-13 Nortel Networks Corporation Systèmes à fibres optiques amplifiés
EP0485101A3 (en) * 1990-11-09 1993-03-31 Northern Telecom Limited Amplified optical fibre systems
DE4038503A1 (de) * 1990-12-03 1992-06-04 Kommunikations Elektronik Vorrichtung zum verbinden von zwei optischen fasern
EP0492850A3 (en) * 1990-12-20 1992-11-19 American Telephone And Telegraph Company Isolated optical coupler
EP0492850A2 (fr) * 1990-12-20 1992-07-01 AT&T Corp. Coupleur optique avec isolateur optique
US8923511B2 (en) 1997-04-23 2014-12-30 Sony Corporation Enciphering apparatus and method, deciphering apparatus and method as well as information processing apparatus and method

Also Published As

Publication number Publication date
GB8612164D0 (en) 1986-06-25
GB8612422D0 (en) 1986-07-02
GB2175766A (en) 1986-12-03
GB8512980D0 (en) 1985-06-26
EP0222866A1 (fr) 1987-05-27

Similar Documents

Publication Publication Date Title
WO1986007221A1 (fr) Instrument repetiteur pour fibres optiques
US4301543A (en) Fiber optic transceiver and full duplex point-to-point data link
EP0412727B1 (fr) Système de communication optique
US4910727A (en) Optical transceiver having waveguide couplers for filtering and duplexing transmit and receive wavelengths
JP3737286B2 (ja) 光ファイバ通信システム
US5416629A (en) Intensity modulated digital optical communications using a frequency modulated signal laser
JP2871702B2 (ja) 集積ファイバ光学送受信装置
EP0795973A1 (fr) Méthode de compensation sélective de la dispersion chromatique de signaux optiques
EP0444694B1 (fr) Coupleur optique
US4955014A (en) Broadband optical communication system, particularly in the subscriber area
US5966228A (en) Optical transmission system and optical repeater
EP0499388B1 (fr) Liaison de communication bidirective à fibre optique avec amplificateur
US9383528B2 (en) Light-receiving module
US6236495B1 (en) Optical dispersion compensation
US20030081294A1 (en) Free-space optical WDM communication system
US5170447A (en) Optical communication system with a fiber-optic amplifier
US6377392B1 (en) Optical amplifier
US4859015A (en) Optical receiver having optical gain medium and mode selector
JPH03269522A (ja) 波長多重光伝送路増幅装置
EP1304775B1 (fr) Amplificateur optique à fibre à compensation de dispersion
JPH11258463A (ja) 合波機能内蔵光源モジュールとこれを用いた光増幅器および双方向光伝送装置
JPS63124633A (ja) 特に加入者区域の広帯域光通信システム
US6417962B1 (en) Optical waveguide amplifier optical service channel accessor device and method of making
KR19980075310A (ko) 단일 활성섬유를 이용한 양방향성 광섬유증폭기
KR19980077488A (ko) 반사거울을 구비한 양방향 광섬유증폭기

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR IT LU NL SE