US20090087190A1 - Optical communications - Google Patents

Optical communications Download PDF

Info

Publication number
US20090087190A1
US20090087190A1 US12059221 US5922108A US2009087190A1 US 20090087190 A1 US20090087190 A1 US 20090087190A1 US 12059221 US12059221 US 12059221 US 5922108 A US5922108 A US 5922108A US 2009087190 A1 US2009087190 A1 US 2009087190A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
soliton
dispersion
fibre
management system
km
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.)
Abandoned
Application number
US12059221
Inventor
Nicholas John Doran
Nicholas John Smith
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.)
KEOPALIS CAPITAL LLC
Original Assignee
KEOPALIS CAPITAL LLC
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

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2507Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H04B10/2525Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
    • H04B10/25253Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres with dispersion management, i.e. using a combination of different kind of fibres in the transmission system
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29371Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion
    • G02B6/29374Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion in an optical light guide
    • G02B6/29376Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion in an optical light guide coupling light guides for controlling wavelength dispersion, e.g. by concatenation of two light guides having different dispersion properties
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2507Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/25077Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion using soliton propagation
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/29392Controlling dispersion
    • G02B6/29394Compensating wavelength dispersion

Abstract

A dispersion management system for soliton or soliton-like transmission systems comprises a length of optical fibre (L) in which a plurality of sections (l) made up of components (N, A) of opposite sign dispersions are concatenated together. The duration of the dispersion compensation phase is short in comparison with the propagation interval in the remainder of the system and that the path average dispersion is anomalous.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application claims priority to and is a continuation of U.S. patent application Ser. No. 09/083,966, filed on May 26, 1998 and entitled “Dispersion Management System For Soliton Optical Transmission System;” which is a continuation of International Application PCT/GB96/02923, filed on Nov. 27, 1996 and entitled “Dispersion Management System For Soliton Optical Transmission System;” which claims priority to Great Britain Patent Application No. 9524203.8, filed on Nov. 27, 1995 and entitled “Optical Communications;” each of which is incorporated herein by reference in its entirety. This application is related to U.S. Pat. No. 6,650,452, issued on Nov. 18, 2003 and entitled “Optical Communications,” which is incorporated herein by reference in its entirety.
  • BACKGROUND
  • This invention relates to optical communications and, in particular, to optical communications systems in which information is transmitted by soliton or soliton-like pulses.
  • Laboratory demonstrations have recently been reported of soliton transmission in systems where the dispersion was not uniformly anomalous along the fibre, instead being periodically compensated by fibre of opposite (normal) sign dispersion. In this manner transmission was achieved at 20 Gb/s over 9000 km in a recirculating loop, and 8100 km in a straight line experiment. These figures are substantially in excess of what has previously been achieved without the use of soliton control techniques such as sliding filters and synchronous modulators. While it is thus clear that there are significant benefits to be gained from adopting dispersion management in soliton systems, to date there has been little conceptual explanation of the mechanisms behind this improvement.
  • BRIEF SUMMARY OF THE INVENTION
  • The correct selection of dispersion is a critical issue in the design of amplified long haul optical communication systems. In the case of soliton formatted data, it is dictated by compromise between the desire to minimise timing jitter problems (implying low dispersion), and the need to maintain adequate energy per bit for successful detection. As the energy needed to form a soliton in a uniform fibre is proportional to the dispersion, the latter constraint places a lower limit on the permitted dispersion. Dispersion management is a technique in the context of non-return-to-zero (NRZ) formatted data in which fibres of opposite sign dispersions are concatenated together. This produces a high local dispersion at any given point, and yet a low path-average dispersion. We have found that, by adopting a suitable dispersion management scheme for soliton or soliton-like transmission, it is possible to increase the soliton energy substantially compared with the equivalent uniform fibre with equal path-average dispersion.
  • According to the present invention there is provided a dispersion management system for soliton or soliton-like transmission in which the duration of a dispersion compensation phase is short in comparison with the propagation interval in the remainder of the system.
  • Preferably the system excludes arrangements in which the dispersion map of one fibre is substantially closer to zero than that of its complementary fibre.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will be particularly described with reference to the accompanying drawings in which:
  • FIG. 1 is a dispersion compensation map;
  • FIG. 2 shows the pulse profile at the beginning of each unit cell in a dispersion managed system. The dispersion map comprises alternating 100 km fibres with dispersions of −3 ps2/km and +2.8 ps2/km;
  • FIG. 3 shows the evolution of a over one period of the dispersion compensation cycle.
  • FIG. 4 shows the energy required to launch a 20 ps FWHM soliton in dispersion managed system with alternating 100 km length fibres chosen such that the path-average dispersion remains at −0.1 ps2/km, and
  • FIG. 5 is an outline diagram of a dispersion management system in accordance with one aspect of the invention.
  • FIG. 6 is an outline diagram of a dispersion management system in accordance with one embodiment of the invention.
  • DETAILED DESCRIPTION
  • Our work is based upon numerical integration of the Nonlinear Schrödinger Equation (NLS), using the dispersion map shown in FIG. 1. The arrangement of a typical system is shown in FIG. 5 and comprises a transmitter T and Receiver R lined by a length L of fibre. This fibre is divided into elements l comprising separate sections of fibre N with normal dispersion and fibre A with anomalous dispersion. In a specific embodiment these are of equal length, although the unit cell is defined to start and end at the mid point of one of the fibres. In the specific examples presented, each of the fibres will be 100 km long, and the path average dispersion −0.1 ps2/km. The nonlinear coefficient was taken to be 2.65 rad/W/km. To simplify the problem we have chosen to neglect loss and high order dispersion throughout.
  • We have confirmed the existence of quasi-stable soliton or solitary wave solutions to this dispersion map. FIGS. 2 and 3 show the observed behaviour when the dispersion values alternated between −3.0 ps2/km and +2.8 ps2/km, and a 20 ps FWHM Gaussian pulse of peak power 650 pW was launched into the fibre. FIG. 2 shows the intensity profiles at the start of each unit cell; it can be seen that the pulse profile at these points remains unchanged over successive cycles of the dispersion map. The evolution within one unit cell is shown in FIG. 3, the pulse alternately compressing and dispersing as the sign of the dispersion is switched. The power spectrum remains essentially unchanged within the unit cell.
  • There are three constraints which must be satisfied to obtain stable solutions to the periodic dispersion map. Firstly, the path average dispersion must be anomalous, in order that the Kerr induced spectral broadening can be compensated. Secondly, the period of the dispersion compensation cycle must be short compared to the nonlinear length of the system. For a 1000 Km fibre, the dispersion compensation length is preferably 100 Km or less. Finally, dispersion maps in which one of the fibres is much closer to zero dispersion than the other should be avoided as otherwise energy is rapidly coupled out of the pulse into dispersive waves.
  • The advantages conferred by a dispersion management scheme on soliton communications stems from the fact that more energy is required to launch a stable pulse than in the equivalent uniform system with equal path average dispersion. This is demonstrated in FIG. 4, which plots the pulse energy of the stable solution as a function of the difference between the dispersion values of the two individual fibres. Preferably, the difference between fibre dispersions is less than 12.0 ps2/Km and, ideally, less than 4.0 ps2/Km. Under optimum conditions it will be 0.1 ps2/Km or less. Greater differences between the two fibres results in more energy being required to form a stable pulse; we have also found that lengthening the unit cell's period (with a given pair of dispersion values) increases the required energy. The mechanism behind this increased energy requirement can be understood from the intensity profile within the unit cell, FIG. 3. Due to the cycle of dispersive broadening and compression, the peak power of the pulse is generally lower than the initial launch power. Therefore the rate of self phase modulation (SPM) is reduced compared to the equivalent uniform fibre, and so more energy is required to balance the path-average dispersion. In the frequency domain, the process could be construed as a reduction in the efficiency of four wave mixing of which SPM is a special case.
  • Another highly novel feature of these solitary waves is that their pulse shapes are not the hyperbolic secants of regular optical fibre solitons. The example pulse profile which we have displayed is almost exactly Gaussian in nature, however this is only a special case for that particular dispersion map. As the dispersion variation is increased there-is a transition from the uniform fibre hyperbolic secant soliton (time-bandwidth-product 0.32) to Gaussian (0.44) form, and then to pulse shapes with higher still time-bandwidth-products. An interesting connection can be made at this point with the “stretched pulse” design of mode-locked fibre laser. These incorporate cavities with two opposite signs of dispersion and also produce Gaussian shaped pulses.
  • In cases of soliton or soliton-like transmission in dispersion compensated fibres employing a configuration with zero path average dispersion, undistorted pulse propagation was obtained in this situation due to the presence of optical filters in the recirculating loop. The stable pulses then arose from balancing SPM against filtering, rather than SPM against the path-average dispersion.
  • CONCLUSION
  • The technique of dispersion management has the potential to make a significant impact of the realisation of soliton-communication systems. It provides major performance benefits, and has the distinct advantage of requiring only passive components. While, in a preferred embodiment, we have used equal lengths of two different fibres, alternative embodiments may use discrete dispersion compensators (C) fabricated from highly dispersive materials as shown for example in FIG. 6. The adoption of dispersion management represents a convergence between the techniques used in soliton and NRZ formatted transmission.

Claims (6)

  1. 1. A dispersion management system for soliton or soliton-like transmission systems in which fibers of opposite sign dispersions are concatenated together characterised in that the duration of a dispersion compensation phase is short in comparison with the propagation interval in the remainder of the system and that the path average dispersion is anomalous.
  2. 2. A dispersion management system for soliton or soliton-like transmission systems according to claim 1 characterised in that the system excludes arrangements in which the dispersion map of one fibre (N) is substantially closer to zero than that of is complementary fibre (A).
  3. 3. A dispersion management system for soliton or soliton-like transmission systems according to claim 2 characterised in that the difference between fibre dispersions is less than 12.0 ps2/km.
  4. 4. A dispersion management system for soliton or soliton-like transmission systems according to claim 2 characterised in that the difference between fibre dispersions is less than 4.0 ps2/km.
  5. 5. A dispersion management system for soliton or soliton-like transmission systems according to claim 2 characterised in that the difference between fibre dispersions is less than 0.1 ps2/km.
  6. 6. A dispersion management system for soliton or soliton-like transmission systems according to claim 1 characterised in that compensation is provided by discrete dispersion compensator means.
US12059221 1995-11-27 2008-03-31 Optical communications Abandoned US20090087190A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9524203A GB9524203D0 (en) 1995-11-27 1995-11-27 Optical communications
GB9524203.8 1995-11-27
PCT/GB1996/002923 WO1997020403A1 (en) 1995-11-27 1996-11-27 Dispersion management system for soliton optical transmission system
US09083966 US7352970B2 (en) 1995-11-27 1998-05-26 Dispersion management system for soliton optical transmission system
US12059221 US20090087190A1 (en) 1995-11-27 2008-03-31 Optical communications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12059221 US20090087190A1 (en) 1995-11-27 2008-03-31 Optical communications

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09083966 Continuation US7352970B2 (en) 1995-11-27 1998-05-26 Dispersion management system for soliton optical transmission system

Publications (1)

Publication Number Publication Date
US20090087190A1 true true US20090087190A1 (en) 2009-04-02

Family

ID=10784498

Family Applications (3)

Application Number Title Priority Date Filing Date
US09083966 Expired - Lifetime US7352970B2 (en) 1995-11-27 1998-05-26 Dispersion management system for soliton optical transmission system
US09653540 Expired - Fee Related US6650452B1 (en) 1995-11-27 2000-08-31 Optical communications
US12059221 Abandoned US20090087190A1 (en) 1995-11-27 2008-03-31 Optical communications

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US09083966 Expired - Lifetime US7352970B2 (en) 1995-11-27 1998-05-26 Dispersion management system for soliton optical transmission system
US09653540 Expired - Fee Related US6650452B1 (en) 1995-11-27 2000-08-31 Optical communications

Country Status (6)

Country Link
US (3) US7352970B2 (en)
EP (2) EP0864210A1 (en)
JP (1) JP4459304B2 (en)
CN (2) CN1625085B (en)
GB (1) GB9524203D0 (en)
WO (1) WO1997020403A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9524203D0 (en) 1995-11-27 1996-01-31 British Tech Group Optical communications
GB9716230D0 (en) * 1997-07-31 1997-10-08 British Tech Group Optical fibre communication system
EP1136850A4 (en) 1999-09-06 2003-01-15 Sumitomo Electric Industries Optical fiber line, optical transmission line, production method of optical cables and method of laying optical transmission lines
FR2800218B1 (en) * 1999-10-22 2002-01-11 Algety Telecom optical fiber transmission system using RZ pulses
FR2800219B1 (en) 1999-10-22 2006-06-30 Algety Telecom power adjusting method for an optical transmission system has wavelength-division multiplexing
CA2340848A1 (en) * 2001-03-15 2002-09-15 John D. Mcnicol Dispersion management for long-haul high-speed optical networks
US20030007216A1 (en) * 2001-06-21 2003-01-09 Chraplyvy Andrew Roman Long haul transmission in a dispersion managed optical communication system
DE60110473D1 (en) * 2001-09-28 2005-06-02 Pirelli & C Spa An optical transmission system with dispersion management system
US9547215B1 (en) * 2015-11-05 2017-01-17 United Arab Emirates University Device for performing multiple optical operations in communication network

Citations (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4778237A (en) * 1984-06-07 1988-10-18 The Board Of Trustees Of The Leland Stanford Junior University Single-mode fiber optic saturable absorber
US5035481A (en) * 1990-08-23 1991-07-30 At&T Bell Laboratories Long distance soliton lightwave communication system
US5218662A (en) * 1992-05-06 1993-06-08 Alcatel Network Systems, Inc. Fiber-optic cable system and method for dispersion compensation at nodes between end points
US5224183A (en) * 1992-07-23 1993-06-29 Alcatel Network Systems, Inc. Multiple wavelength division multiplexing signal compensation system and method using same
US5343322A (en) * 1991-12-31 1994-08-30 France Telecom System of very-long-distance digital transmission by optical fiber with compensation for distortions at reception
US5471333A (en) * 1992-09-25 1995-11-28 Kokusai Denshin Denwa Kabushiki Kaisha Optical communication system
US5488620A (en) * 1995-01-05 1996-01-30 Hughes Aircraft Company Passively mode locked-laser and method for generating a pseudo random optical pulse train
US5508845A (en) * 1990-10-18 1996-04-16 Telstra Corporation Limited Quasi-soliton communication system
US5513194A (en) * 1994-06-30 1996-04-30 Massachusetts Institute Of Technology Stretched-pulse fiber laser
US5532861A (en) * 1993-07-06 1996-07-02 France Telecom Optical fiber transmission system with compensation for line distortions
US5557441A (en) * 1994-10-17 1996-09-17 At&T Soliton transmission system having plural sliding-frequency guiding filter groups
US5559910A (en) * 1994-06-06 1996-09-24 Kokusai Denshin Denwa Kabushiki Kaisha Wavelength division multiplexed optical fiber transmission equiptment
US5574590A (en) * 1994-09-12 1996-11-12 Kokusai Denshin Denwa Kabushiki Kaisha Optical amplifying transmitting system
US5577057A (en) * 1991-03-01 1996-11-19 Telstra Corporation Limited Modelocked lasers
US5606445A (en) * 1993-09-03 1997-02-25 Hitachi, Ltd. Optical transmission system
US5612808A (en) * 1993-01-28 1997-03-18 Alcatel N.V. System and a method for performing soliton transmission
US5629795A (en) * 1994-09-12 1997-05-13 Kokusai Denshin Denwa Kabushiki Kaisha Optical amplifying-repeating transmission system
US5680491A (en) * 1992-09-29 1997-10-21 Sumitomo Electric Industries, Ltd. Optical fiber dispersion compensation device for optical communication system
US5717510A (en) * 1994-08-02 1998-02-10 Fujitsu Limited Optimized optical transmission system for high capacity transmission
US5764841A (en) * 1996-04-25 1998-06-09 Nippon Telegraph And Telephone Corporation Optical fiber transmission line, optical fiber transmission system and production method thereof, and optical fiber combining method
US5798853A (en) * 1992-10-16 1998-08-25 Fujitsu, Limited Optical communication system compensating for chromatic dispersion and phase conjugate light generator for use therewith
US5828478A (en) * 1995-09-01 1998-10-27 France Telecom System for transmitting RZ pulses over an amplified optical line, in particular over long distances
US5887105A (en) * 1997-04-28 1999-03-23 Corning Incorporated Dispersion managed optical fiber
US5898716A (en) * 1996-09-23 1999-04-27 Electronics And Telecommunications Research Institute Structure of a passively mode-locked optical fiber laser
US5905825A (en) * 1996-03-18 1999-05-18 Alcatel Submarine Networks Optical transmission method and system using solitons
US5966228A (en) * 1995-12-04 1999-10-12 Kokusai Denshin Denwa Kabushiki Kaisha Optical transmission system and optical repeater
US6005702A (en) * 1996-02-23 1999-12-21 Kokusai Denshin Denwa Kabushiki-Kaisha Optical transmission device, WDM optical transmission apparatus, and optical transmission system using return-to-zero optical pulses
US6097524A (en) * 1995-05-17 2000-08-01 Btg International Limited Optical communication systems
US6122088A (en) * 1996-12-09 2000-09-19 Japan Science And Technology Corporation Ultra-high speed light transmission method making use of quasi-solitons in fibers
US6137604A (en) * 1996-12-04 2000-10-24 Tyco Submarine Systems, Ltd. Chromatic dispersion compensation in wavelength division multiplexed optical transmission systems
US6215929B1 (en) * 1996-07-06 2001-04-10 Nortel Networks Limited Dispersion compensating waveguide for optical transmission systems
US6307985B1 (en) * 1998-07-10 2001-10-23 Micro Therapeutics, Inc. Optical transmission system
US6321015B1 (en) * 1997-07-31 2001-11-20 Btg International Limited Optical fibre communication system
US20020076183A1 (en) * 1995-11-27 2002-06-20 Nicholas J. Doran Dispersion management system for soliton optical transmission system
US6433923B2 (en) * 1998-05-08 2002-08-13 Fujitsu Limited Optical transmission path having sections which overcompensate for dispersion occurring in the sections
US6442320B1 (en) * 1999-04-16 2002-08-27 Lasercomm Inc. Limited mode dispersion compensating optical fiber
US6473550B1 (en) * 1999-09-27 2002-10-29 Sumitomo Electric Industries, Ltd. Optical fiber transmission-line
US6487005B2 (en) * 1998-07-21 2002-11-26 France Telecom Optical fiber transmission system with chromatic dispersion compensation
US6543181B1 (en) * 2001-06-22 2003-04-08 Iowa State University Research Foundation, Inc. Fruit fly attractant compositions
US20030185574A1 (en) * 2002-03-27 2003-10-02 Yoshihisa Inada Optical fiber transmission line for wavelength division multiplexing signals
US6680787B1 (en) * 1995-05-17 2004-01-20 Btg International Limited Optical communication systems
US6701050B1 (en) * 2001-10-10 2004-03-02 The Regents Of The University Of California Methods and optical fibers that decrease pulse degradation resulting from random chromatic dispersion
US20040076373A1 (en) * 2001-01-10 2004-04-22 Blow Keith James Optical pulse regenerating transmission lines

Family Cites Families (17)

* Cited by examiner, † Cited by third party
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
JP2798681B2 (en) * 1988-10-03 1998-09-17 日本電信電話株式会社 Optical fiber transmission line
JP2612080B2 (en) 1990-01-19 1997-05-21 日本電信電話株式会社 Optical soliton generation method and soliton transmission method
JP2830485B2 (en) 1991-02-19 1998-12-02 日本電気株式会社 Optical fiber dispersion compensator
WO1992015179A1 (en) 1991-02-22 1992-09-03 Motorola, Inc. Manifold antenna structure for reducing reuse factors
JP2825989B2 (en) 1991-04-01 1998-11-18 日本電信電話株式会社 Optical soliton transmission method
JP2825109B2 (en) 1991-05-13 1998-11-18 日本電信電話株式会社 Optical soliton transmission method
FR2681202B1 (en) 1991-09-06 1993-11-12 Alcatel Cit optical communication link with correction of non-linear effects, and processing an optical signal METHOD.
JPH05152645A (en) 1991-11-29 1993-06-18 Hitachi Cable Ltd Optical equalization amplifier and optical fiber transmission system using same
JP2743972B2 (en) 1992-06-09 1998-04-28 国際電信電話株式会社 Optical amplifier repeater transmission method and system apparatus
JPH0618943A (en) 1992-06-29 1994-01-28 Nippon Telegr & Teleph Corp <Ntt> Light soliton transmission line
WO1994024781A1 (en) * 1993-04-19 1994-10-27 British Technology Group Limited Optical communications dispersion compensation system
JPH08146472A (en) 1994-11-15 1996-06-07 Nippon Telegr & Teleph Corp <Ntt> Optical soliton communication method
JPH08286219A (en) 1995-02-13 1996-11-01 Nippon Telegr & Teleph Corp <Ntt> Light soliton transmission line and light soliton transmission method
GB2346025B (en) 1995-09-11 2000-09-13 Univ Southampton Optical pulse propagation
US6243181B1 (en) 1997-02-14 2001-06-05 University Of Maryland Baltimore County Reduction of collision induced timing jitter by periodic dispersion management in soliton WDM transmission
USH1926H (en) * 1997-04-01 2000-12-05 Carruthers; Thomas F. Actively mode-locked, single-polarization, picosecond optical fiber laser

Patent Citations (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4778237A (en) * 1984-06-07 1988-10-18 The Board Of Trustees Of The Leland Stanford Junior University Single-mode fiber optic saturable absorber
US5035481A (en) * 1990-08-23 1991-07-30 At&T Bell Laboratories Long distance soliton lightwave communication system
US5508845A (en) * 1990-10-18 1996-04-16 Telstra Corporation Limited Quasi-soliton communication system
US5577057A (en) * 1991-03-01 1996-11-19 Telstra Corporation Limited Modelocked lasers
US5343322A (en) * 1991-12-31 1994-08-30 France Telecom System of very-long-distance digital transmission by optical fiber with compensation for distortions at reception
US5218662A (en) * 1992-05-06 1993-06-08 Alcatel Network Systems, Inc. Fiber-optic cable system and method for dispersion compensation at nodes between end points
US5224183A (en) * 1992-07-23 1993-06-29 Alcatel Network Systems, Inc. Multiple wavelength division multiplexing signal compensation system and method using same
US5471333A (en) * 1992-09-25 1995-11-28 Kokusai Denshin Denwa Kabushiki Kaisha Optical communication system
US5680491A (en) * 1992-09-29 1997-10-21 Sumitomo Electric Industries, Ltd. Optical fiber dispersion compensation device for optical communication system
US5798853A (en) * 1992-10-16 1998-08-25 Fujitsu, Limited Optical communication system compensating for chromatic dispersion and phase conjugate light generator for use therewith
US5612808A (en) * 1993-01-28 1997-03-18 Alcatel N.V. System and a method for performing soliton transmission
US5532861A (en) * 1993-07-06 1996-07-02 France Telecom Optical fiber transmission system with compensation for line distortions
US5606445A (en) * 1993-09-03 1997-02-25 Hitachi, Ltd. Optical transmission system
US5559910A (en) * 1994-06-06 1996-09-24 Kokusai Denshin Denwa Kabushiki Kaisha Wavelength division multiplexed optical fiber transmission equiptment
US5513194A (en) * 1994-06-30 1996-04-30 Massachusetts Institute Of Technology Stretched-pulse fiber laser
US5717510A (en) * 1994-08-02 1998-02-10 Fujitsu Limited Optimized optical transmission system for high capacity transmission
US5629795A (en) * 1994-09-12 1997-05-13 Kokusai Denshin Denwa Kabushiki Kaisha Optical amplifying-repeating transmission system
US5574590A (en) * 1994-09-12 1996-11-12 Kokusai Denshin Denwa Kabushiki Kaisha Optical amplifying transmitting system
US5557441A (en) * 1994-10-17 1996-09-17 At&T Soliton transmission system having plural sliding-frequency guiding filter groups
US5488620A (en) * 1995-01-05 1996-01-30 Hughes Aircraft Company Passively mode locked-laser and method for generating a pseudo random optical pulse train
US6097524A (en) * 1995-05-17 2000-08-01 Btg International Limited Optical communication systems
US6680787B1 (en) * 1995-05-17 2004-01-20 Btg International Limited Optical communication systems
US5828478A (en) * 1995-09-01 1998-10-27 France Telecom System for transmitting RZ pulses over an amplified optical line, in particular over long distances
US6650452B1 (en) * 1995-11-27 2003-11-18 Btg International Limited Optical communications
US20020076183A1 (en) * 1995-11-27 2002-06-20 Nicholas J. Doran Dispersion management system for soliton optical transmission system
US7352970B2 (en) * 1995-11-27 2008-04-01 Btg International Limited Dispersion management system for soliton optical transmission system
US5966228A (en) * 1995-12-04 1999-10-12 Kokusai Denshin Denwa Kabushiki Kaisha Optical transmission system and optical repeater
US6005702A (en) * 1996-02-23 1999-12-21 Kokusai Denshin Denwa Kabushiki-Kaisha Optical transmission device, WDM optical transmission apparatus, and optical transmission system using return-to-zero optical pulses
US5905825A (en) * 1996-03-18 1999-05-18 Alcatel Submarine Networks Optical transmission method and system using solitons
US5764841A (en) * 1996-04-25 1998-06-09 Nippon Telegraph And Telephone Corporation Optical fiber transmission line, optical fiber transmission system and production method thereof, and optical fiber combining method
US6215929B1 (en) * 1996-07-06 2001-04-10 Nortel Networks Limited Dispersion compensating waveguide for optical transmission systems
US5898716A (en) * 1996-09-23 1999-04-27 Electronics And Telecommunications Research Institute Structure of a passively mode-locked optical fiber laser
US6137604A (en) * 1996-12-04 2000-10-24 Tyco Submarine Systems, Ltd. Chromatic dispersion compensation in wavelength division multiplexed optical transmission systems
US6122088A (en) * 1996-12-09 2000-09-19 Japan Science And Technology Corporation Ultra-high speed light transmission method making use of quasi-solitons in fibers
US5887105A (en) * 1997-04-28 1999-03-23 Corning Incorporated Dispersion managed optical fiber
US6738542B1 (en) * 1997-07-30 2004-05-18 Btg International Limited Optical fibre communication system
US6321015B1 (en) * 1997-07-31 2001-11-20 Btg International Limited Optical fibre communication system
US20040105685A1 (en) * 1997-07-31 2004-06-03 Btg International Limited Optical fibre communication system
US6433923B2 (en) * 1998-05-08 2002-08-13 Fujitsu Limited Optical transmission path having sections which overcompensate for dispersion occurring in the sections
US6307985B1 (en) * 1998-07-10 2001-10-23 Micro Therapeutics, Inc. Optical transmission system
US6487005B2 (en) * 1998-07-21 2002-11-26 France Telecom Optical fiber transmission system with chromatic dispersion compensation
US6442320B1 (en) * 1999-04-16 2002-08-27 Lasercomm Inc. Limited mode dispersion compensating optical fiber
US6473550B1 (en) * 1999-09-27 2002-10-29 Sumitomo Electric Industries, Ltd. Optical fiber transmission-line
US20040076373A1 (en) * 2001-01-10 2004-04-22 Blow Keith James Optical pulse regenerating transmission lines
US6543181B1 (en) * 2001-06-22 2003-04-08 Iowa State University Research Foundation, Inc. Fruit fly attractant compositions
US6701050B1 (en) * 2001-10-10 2004-03-02 The Regents Of The University Of California Methods and optical fibers that decrease pulse degradation resulting from random chromatic dispersion
US20030185574A1 (en) * 2002-03-27 2003-10-02 Yoshihisa Inada Optical fiber transmission line for wavelength division multiplexing signals

Also Published As

Publication number Publication date Type
US7352970B2 (en) 2008-04-01 grant
CN1242572C (en) 2006-02-15 grant
EP1507345A3 (en) 2006-04-12 application
WO1997020403A1 (en) 1997-06-05 application
US20020076183A1 (en) 2002-06-20 application
EP1507345A2 (en) 2005-02-16 application
JP2000501256A (en) 2000-02-02 application
US6650452B1 (en) 2003-11-18 grant
CN1625085B (en) 2010-12-08 grant
GB9524203D0 (en) 1996-01-31 grant
EP0864210A1 (en) 1998-09-16 application
JP4459304B2 (en) 2010-04-28 grant
CN1625085A (en) 2005-06-08 application
CN1202994A (en) 1998-12-23 application

Similar Documents

Publication Publication Date Title
Essiambre et al. Pseudo-linear transmission of high-speed TDM signals: 40 and 160 Gb/s
US5877881A (en) Optical transmission system
US5798853A (en) Optical communication system compensating for chromatic dispersion and phase conjugate light generator for use therewith
Hui et al. Cross-phase modulation in multispan WDM optical fiber systems
US6504972B2 (en) Optical fiber communication system using optical phase conjugation as well as apparatus applicable to the system and method of producing the same
US6477300B2 (en) Method, device, and system for waveform shaping of signal light
Breuer et al. Comparison of NRZ-and RZ-modulation format for 40-Gb/s TDM standard-fiber systems
US6175435B1 (en) Optical communication system using optical phase conjugation to suppress waveform distortion caused by chromatic dispersion and optical kerr effect
US6459518B1 (en) Optical transmitting apparatus
Xu et al. Comparison of FWM-and XPM-induced crosstalk using the Volterra series transfer function method
US6204960B1 (en) Quasi-distributed amplification in a fiber optic soliton signal transmission system
US6721081B1 (en) Variable duty cycle optical pulses
US5574590A (en) Optical amplifying transmitting system
Cartaxo Cross-phase modulation in intensity modulation-direct detection WDM systems with multiple optical amplifiers and dispersion compensators
Mollenauer et al. Demonstration of massive wavelength-division multiplexing over transoceanic distances by use of dispersion-managed solitons
US6317238B1 (en) Chromatic dispersion management for optical wavelength division multiplexed transmission systems
Kawanishi et al. 200 Gbit/s, 100 km time-division-multiplexed optical transmission using supercontinuum pulses with prescaled PLL timing extraction and all-optical demultiplexing
US5339183A (en) Optical signal transmission device
US6587242B1 (en) Optical transmission system
Turitsyn et al. Physics and mathematics of dispersion-managed optical solitons
Nakazawa et al. Ultrahigh-speed long-distance TDM and WDM soliton transmission technologies
US6311002B1 (en) Method and apparatus for reducing nonlinear penalties by proper arrangement of the dispersion map in an optical communication system
EP0622916A1 (en) Optical soliton generator
Smith et al. Soliton transmission using periodic dispersion compensation
EP0718990A2 (en) Method and apparatus for generating data encoded pulses in return-to-zero format

Legal Events

Date Code Title Description
AS Assignment

Owner name: BTG INTERNATIONAL LIMITED, UNITED KINGDOM

Free format text: CHANGE OF NAME;ASSIGNOR:BRITISH TECHNOLOGY GROUP LIMITED;REEL/FRAME:021875/0665

Effective date: 19980527

Owner name: BRITISH TECHNOLOGY GROUP LIMITED, UNITED KINGDOM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DORAN, NICHOLAS JOHN;SMITH, NICHOLAS JOHN;REEL/FRAME:021875/0645;SIGNING DATES FROM 19980427 TO 19980503

AS Assignment

Owner name: KEOPALIS CAPITAL, L.L.C., DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BTG INTERNATIONAL LIMITED;REEL/FRAME:022566/0044

Effective date: 20090318