EP0695483A1 - Dispositif de compensation de dispersion pour systeme de telecommunications optiques - Google Patents

Dispositif de compensation de dispersion pour systeme de telecommunications optiques

Info

Publication number
EP0695483A1
EP0695483A1 EP94912650A EP94912650A EP0695483A1 EP 0695483 A1 EP0695483 A1 EP 0695483A1 EP 94912650 A EP94912650 A EP 94912650A EP 94912650 A EP94912650 A EP 94912650A EP 0695483 A1 EP0695483 A1 EP 0695483A1
Authority
EP
European Patent Office
Prior art keywords
optical communications
optical
fibre
communications system
transmission path
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.)
Withdrawn
Application number
EP94912650A
Other languages
German (de)
English (en)
Inventor
Nicholas John Doran
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.)
BTG International Ltd
Original Assignee
BTG International Ltd
British Technology Group Ltd
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 GB939308037A external-priority patent/GB9308037D0/en
Priority claimed from GB939320510A external-priority patent/GB9320510D0/en
Application filed by BTG International Ltd, British Technology Group Ltd filed Critical BTG International Ltd
Publication of EP0695483A1 publication Critical patent/EP0695483A1/fr
Withdrawn legal-status Critical Current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
    • H04B10/25—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
    • H04B10/2531—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using spectral inversion

Definitions

  • This invention relates to optical communications and, in particular, to methods of enhancing the performance of optical communications systems.
  • an optical communications system having a transmission path including an optical communications fibre having an input port and an output port wherein a compensating element to compensate for a perturbation in an optical signal transmitted along said transmission path is coupled to the output port.
  • a soliton communication system in which soliton timing jitter is at least partially compensated by the introduction of post transmission dispersion compensation.
  • Figures 1 to 3 are graphical representations of experimental results
  • Figures 4 and 5 are schematic drawings of communications systems in accordance with specific embodiments of the invention.
  • Analysis shows that the deviation in a soliton's mean position ⁇ At 2 > 1/,2 t is proportional to the magnitude of the of the fibre dispersion
  • the principle underlying this dependence is that the amplifier-induced frequency jitter is translated from frequency to time, during propagation between amplifiers, via dispersion. For any individual period complete compensation may be achieved by the addition of linear dispersion of equal magnitude and opposite sign.
  • Analysis indicates that in a concatinated chain of amplified sections ⁇ t 2 can be reduced by one half if post transmission dispersion compensation of half the previous total dispersion is introduced.
  • the fibre into which the signal is subsequently launched may simply be a compensating loop of appropriate length or it may be a further transmission stage of the communications path.
  • This scheme will perform dispersion compensation but has the advantage of allowing soliton propagation in the compensating part and thus eliminates pulse broadening, permitting a full factor of half post transmission compensation. Additionally, the use of this technique also compensates for linear dispersive broadening (not present in soliton systems) and nonlinear interactions, which latter are very Important in both NRZ and soliton systems.
  • Our method of compensation uses four-wave mixing (4WM) in a fibre to perform the phase conjugation.
  • four-wave mixing also includes any other phase conjugation scheme.
  • N ⁇ t 2 > ⁇ (D 1 Z a j) 2 ⁇ 2 > j-i
  • D ⁇ fibre dispersion (ps/n /Km)
  • Z a amplifier spacing (Km)
  • N the number of amplifiers.
  • phase conjugation In soliton systems jitter and SPM compensation can be achieved if the phase conjugation is performed at the midpoint of the system.
  • the jitter reduction is exactly as above, i.e reduction to half its otherwise RMS value, but the soliton-soliton interaction and any other NLS effects are exactly balanced at the end of the system.
  • the phase conjugation 1s performed two-thirds of the way down the system, the RMS jitter is reduced by a factor of 3 but the NLS undoing is only 50%, as explained above.
  • the absolute optimum is to perform phase conjugation at every amplifier - this eliminates all jitter and finds practical application in shorter distance systems and NRZ systems where it permits larger amplifier spacing.
  • NRZ systems are not limited by noise induced jitter, but may be limited by nonlinear effects and in particular by spectral broadening.
  • phase conjugation can give compensation for nonlinear and dispersive effects either by post transmission processing or by intermediate operation.
  • post transmission processing it is desirable to have a dispersive and a nonlinear length equal to the system length.
  • its length can be reduced by increasing the power relative to the power in the transmission part.
  • four-wave mixing at the midpoint will give exact compensation provided the effect is due to dispersion and nonlinearity. Any nonlinear or frequency dependent loss will reduce the exact balance.
  • a fibre optic communications system 1 passing signals from A to B includes an optical fibre 2 and has an input port 3 and an output port 4. Coupled to the output port is a compensating element 5 including an optical fibre 6 and adapted to introduce dispersion of equal magnitude but opposite sign to that of the signal which has passed through the system 1.
  • a four wave mixer FWM is connected between substantially identical components 1,2 7,8 of the communications system.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

Système de télécommunications optiques comportant une voie de transmission comprenant une fibre de communication optique munie d'une entrée et d'une sortie. Un élément de compensation permettant de compenser un phénomène indésirable, tel qu'un bruit de gigue de soliton dans un signal optique transmis sur cette voie de transmission, est relié à la sortie.
EP94912650A 1993-04-19 1994-04-19 Dispositif de compensation de dispersion pour systeme de telecommunications optiques Withdrawn EP0695483A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9308037 1993-04-19
GB939308037A GB9308037D0 (en) 1993-04-19 1993-04-19 Optical communications
GB939320510A GB9320510D0 (en) 1993-10-05 1993-10-05 Optical communications
GB9320510 1993-10-05
PCT/GB1994/000824 WO1994024781A1 (fr) 1993-04-19 1994-04-19 Dispositif de compensation de dispersion pour systeme de telecommunications optiques

Publications (1)

Publication Number Publication Date
EP0695483A1 true EP0695483A1 (fr) 1996-02-07

Family

ID=26302775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912650A Withdrawn EP0695483A1 (fr) 1993-04-19 1994-04-19 Dispositif de compensation de dispersion pour systeme de telecommunications optiques

Country Status (8)

Country Link
EP (1) EP0695483A1 (fr)
JP (1) JPH08509107A (fr)
CN (1) CN1125024A (fr)
AU (1) AU6511194A (fr)
BR (1) BR9406430A (fr)
CA (1) CA2160921A1 (fr)
GB (1) GB2277651B (fr)
WO (1) WO1994024781A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6680787B1 (en) 1995-05-17 2004-01-20 Btg International Limited Optical communication systems
GB9518524D0 (en) * 1995-09-11 1995-11-08 Univ Southampton Optical pulse propagation
GB2346025B (en) 1995-09-11 2000-09-13 Univ Southampton Optical pulse propagation
GB9524203D0 (en) 1995-11-27 1996-01-31 British Tech Group Optical communications
FR2771570B1 (fr) 1997-11-27 2004-09-24 Alsthom Cge Alkatel Reduction de la gigue de collision par echange de longueurs d'onde dans un systeme de transmission a fibre optique a signaux solitons et a multiplexage de longueur d'onde

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000483A1 (fr) * 1983-07-11 1985-01-31 Nippon Telegraph And Telephone Public Corporation Procede de transmission directe d'images
JP2830485B2 (ja) * 1991-02-19 1998-12-02 日本電気株式会社 光ファイバ分散補償装置
JP2825109B2 (ja) * 1991-05-13 1998-11-18 日本電信電話株式会社 光ソリトン伝送方法
JPH053453A (ja) * 1991-06-24 1993-01-08 Mitsubishi Electric Corp 光通信システム
US5146517A (en) * 1991-07-05 1992-09-08 At&T Bell Laboratories Low distortion all-optical threshold device
FR2681202B1 (fr) * 1991-09-06 1993-11-12 Alcatel Cit Liaison de communication optique avec correction d'effets non lineaires, et procede de traitement d'un signal optique.
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
JP2743972B2 (ja) * 1992-06-09 1998-04-28 国際電信電話株式会社 光増幅中継伝送方法およびシステム装置
FR2700901B1 (fr) * 1993-01-28 1995-02-24 Alcatel Nv Système et procédé de transmission à solitons.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9424781A1 *

Also Published As

Publication number Publication date
GB9407725D0 (en) 1994-06-15
AU6511194A (en) 1994-11-08
GB2277651A (en) 1994-11-02
BR9406430A (pt) 1996-01-09
CA2160921A1 (fr) 1994-10-27
WO1994024781A1 (fr) 1994-10-27
JPH08509107A (ja) 1996-09-24
CN1125024A (zh) 1996-06-19
GB2277651B (en) 1997-12-10

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Legal Events

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