WO1994024781A1 - Optical communications dispersion compensation system - Google Patents
Optical communications dispersion compensation system Download PDFInfo
- Publication number
- WO1994024781A1 WO1994024781A1 PCT/GB1994/000824 GB9400824W WO9424781A1 WO 1994024781 A1 WO1994024781 A1 WO 1994024781A1 GB 9400824 W GB9400824 W GB 9400824W WO 9424781 A1 WO9424781 A1 WO 9424781A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical communications
- optical
- fibre
- communications system
- transmission path
- Prior art date
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.
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- 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
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9406430A BR9406430A (en) | 1993-04-19 | 1994-04-19 | Optical communications dispersion compensation system |
JP6522925A JPH08509107A (en) | 1993-04-19 | 1994-04-19 | Optical communication dispersion compensation system |
AU65111/94A AU6511194A (en) | 1993-04-19 | 1994-04-19 | Optical communications dispersion compensation system |
EP94912650A EP0695483A1 (en) | 1993-04-19 | 1994-04-19 | Optical communications dispersion compensation system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939308037A GB9308037D0 (en) | 1993-04-19 | 1993-04-19 | Optical communications |
GB9308037.2 | 1993-04-19 | ||
GB9320510.2 | 1993-10-05 | ||
GB939320510A GB9320510D0 (en) | 1993-10-05 | 1993-10-05 | Optical communications |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994024781A1 true WO1994024781A1 (en) | 1994-10-27 |
Family
ID=26302775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1994/000824 WO1994024781A1 (en) | 1993-04-19 | 1994-04-19 | Optical communications dispersion compensation system |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0695483A1 (en) |
JP (1) | JPH08509107A (en) |
CN (1) | CN1125024A (en) |
AU (1) | AU6511194A (en) |
BR (1) | BR9406430A (en) |
CA (1) | CA2160921A1 (en) |
GB (1) | GB2277651B (en) |
WO (1) | WO1994024781A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6680787B1 (en) | 1995-05-17 | 2004-01-20 | Btg International Limited | Optical communication systems |
GB2346025B (en) | 1995-09-11 | 2000-09-13 | Univ Southampton | Optical pulse propagation |
GB9518524D0 (en) * | 1995-09-11 | 1995-11-08 | Univ Southampton | Optical pulse propagation |
GB9524203D0 (en) * | 1995-11-27 | 1996-01-31 | British Tech Group | Optical communications |
FR2771570B1 (en) * | 1997-11-27 | 2004-09-24 | Alsthom Cge Alkatel | REDUCING COLLISION JIG BY WAVELENGTH EXCHANGE IN A WAVELENGTH MULTIPLEXED SOLITON SIGNAL FIBER TRANSMISSION SYSTEM |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0500357A2 (en) * | 1991-02-19 | 1992-08-26 | Nec Corporation | Optical fiber dispersion-compensating device |
US5146517A (en) * | 1991-07-05 | 1992-09-08 | At&T Bell Laboratories | Low distortion all-optical threshold device |
JPH04335619A (en) * | 1991-05-13 | 1992-11-24 | Nippon Telegr & Teleph Corp <Ntt> | Optical soliton transmitting method |
JPH053453A (en) * | 1991-06-24 | 1993-01-08 | Mitsubishi Electric Corp | Optical communication system |
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 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0151188B1 (en) * | 1983-07-11 | 1991-11-13 | Nippon Telegraph And Telephone Corporation | Method for directly transmitting images |
FR2681202B1 (en) * | 1991-09-06 | 1993-11-12 | Alcatel Cit | OPTICAL COMMUNICATION LINK WITH CORRECTION OF NON-LINEAR EFFECTS, AND METHOD FOR PROCESSING AN OPTICAL SIGNAL. |
JP2743972B2 (en) * | 1992-06-09 | 1998-04-28 | 国際電信電話株式会社 | Optical amplification repeater transmission method and system device |
FR2700901B1 (en) * | 1993-01-28 | 1995-02-24 | Alcatel Nv | Soliton transmission system and method. |
-
1994
- 1994-04-19 JP JP6522925A patent/JPH08509107A/en active Pending
- 1994-04-19 GB GB9407725A patent/GB2277651B/en not_active Expired - Fee Related
- 1994-04-19 CA CA 2160921 patent/CA2160921A1/en not_active Abandoned
- 1994-04-19 CN CN 94192360 patent/CN1125024A/en active Pending
- 1994-04-19 AU AU65111/94A patent/AU6511194A/en not_active Abandoned
- 1994-04-19 WO PCT/GB1994/000824 patent/WO1994024781A1/en not_active Application Discontinuation
- 1994-04-19 BR BR9406430A patent/BR9406430A/en not_active Application Discontinuation
- 1994-04-19 EP EP94912650A patent/EP0695483A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0500357A2 (en) * | 1991-02-19 | 1992-08-26 | Nec Corporation | Optical fiber dispersion-compensating device |
JPH04335619A (en) * | 1991-05-13 | 1992-11-24 | Nippon Telegr & Teleph Corp <Ntt> | Optical soliton transmitting method |
JPH053453A (en) * | 1991-06-24 | 1993-01-08 | Mitsubishi Electric Corp | Optical communication system |
US5146517A (en) * | 1991-07-05 | 1992-09-08 | At&T Bell Laboratories | Low distortion all-optical threshold device |
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 |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 17, no. 182 (P - 1518) 8 April 1993 (1993-04-08) * |
PATENT ABSTRACTS OF JAPAN vol. 17, no. 261 (E - 1369) 21 May 1993 (1993-05-21) * |
R.M.JOPSON ET AL: "Compensation of fibre chromatic dispersion by spectral inversion", ELECTRONICS LETTERS., vol. 29, no. 7, 1 April 1993 (1993-04-01), STEVENAGE GB, pages 576 - 578 * |
Also Published As
Publication number | Publication date |
---|---|
GB9407725D0 (en) | 1994-06-15 |
BR9406430A (en) | 1996-01-09 |
GB2277651B (en) | 1997-12-10 |
CN1125024A (en) | 1996-06-19 |
GB2277651A (en) | 1994-11-02 |
JPH08509107A (en) | 1996-09-24 |
CA2160921A1 (en) | 1994-10-27 |
AU6511194A (en) | 1994-11-08 |
EP0695483A1 (en) | 1996-02-07 |
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