WO2002058301A2 - Procede de division d'ondes et appareil permettant la transmission de donnees dans des systemes de fibres optiques longue portee - Google Patents

Procede de division d'ondes et appareil permettant la transmission de donnees dans des systemes de fibres optiques longue portee Download PDF

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Publication number
WO2002058301A2
WO2002058301A2 PCT/US2002/004676 US0204676W WO02058301A2 WO 2002058301 A2 WO2002058301 A2 WO 2002058301A2 US 0204676 W US0204676 W US 0204676W WO 02058301 A2 WO02058301 A2 WO 02058301A2
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WO
WIPO (PCT)
Prior art keywords
sub
optical
wavelengths
wavelength
data rate
Prior art date
Application number
PCT/US2002/004676
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English (en)
Other versions
WO2002058301A8 (fr
WO2002058301A3 (fr
Inventor
Winston I. Way
Original Assignee
Opvista, Inc.
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 Opvista, Inc. filed Critical Opvista, Inc.
Priority to AU2002251975A priority Critical patent/AU2002251975A1/en
Publication of WO2002058301A2 publication Critical patent/WO2002058301A2/fr
Publication of WO2002058301A8 publication Critical patent/WO2002058301A8/fr
Publication of WO2002058301A3 publication Critical patent/WO2002058301A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/564—Power control

Definitions

  • the present invention relates generally to methods and systems for transmitting optical signals in long-haul optical communication systems, and more particularly to methods and systems that that split a standard ITU wavelength into several sub-wavelengths that can increase the optical signal transmission distance without using dispersion-compensation devices.
  • an optical communication system, and its method of use that has an increased optical transmission distance.
  • an optical communication system, and its method of use that has an increased optical transmission distance without using dispersion-compensating devices.
  • an object of the present invention is to provide an improved long-haul optical communication system and its method of use.
  • Another object of the present invention is to provide an optical communication system, and its method of use, that has an increased optical transmission distance.
  • a further object of the present invention is to provide an optical communication system, and its method of use, that has an increased optical transmission distance without using dispersion-compensating devices.
  • Yet another object of the present invention is to provide an optical communication system, and its method of use, that splits a standard ITU wavelength into several sub-wavelengths in order to increase the optical signal transmission distance without using dispersion-compensation devices or requiring more ITU wavelengths for transmission.
  • An optical input is received that has a first data rate and is split into a plurality of sub- wavelengths.
  • the plurality of sub-wavelengths are spaced sufficiently close in wavelength to provide a spectral efficiency of all the sub-wavelengths that is close to or greater than a spectral efficiency of the optical input.
  • the plurality of sub-wavelengths are then combined.
  • a method for transmitting optical signals in an optical communication system.
  • An optical input is received that has a first spectral efficiency and is split into a plurality of sub-wavelengths.
  • the sub-wavelengths have a combined spectral efficiency close to or greater than the first spectral efficiency.
  • the sub-wavelengths are then combined.
  • a method for transmitting optical signals in an optical communication system.
  • An optical input with a first data rate is received and then split into sub-wavelengths. Each sub-wavelength is in a single ITU window. The sub-wavelengths are then combined.
  • a long haul optical communication system in another embodiment, includes a first optical-to-electronic converter and a first electronic demultiplexer that are configured to receive and split an optical input into a plurality of sub-wavelengths.
  • the optical input has a first data rate.
  • a plurality of optical transmitters are coupled to the first electronic demultiplexer.
  • the plurality of optical transmitters are configured to transmit the plurality of sub-wavelengths with a wavelength spacing that provides a spectral efficiency of all of the sub- wavelengths close to or greater than a spectral efficiency of the optical input.
  • a first optical multiplexer or first coupler, and a second optical demultiplexer, splitter or OADM, are provided.
  • a plurality of receivers are coupled to the optical demultiplexer or splitter.
  • a long haul optical communication system in another embodiment, includes a first optical-to-electronic converter and a first electronic demultiplexer.
  • An optical transmitter is included with a common optical carrier coupled to the first electronic demultiplexer.
  • the optical transmitter is configured to modulate the common optical carrier by using demultiplexed electronic signals, and splits an optical input into a plurality of sub- wavelengths.
  • the sub-wavelengths in combination have a spectral efficiency close to or greater than a spectral efficiency of the optical input.
  • An optical demultiplexer or optical splitter and a second electronic multiplexer are included.
  • a plurality of receivers are positioned to receive input from the optical demultiplexer or the optical splitter and produce an output that is coupled to the second electronic multiplexer ⁇
  • Figure 1 is a schematic diagram of one embodiment of a a long haul optical communication system of the present invention.
  • FIG. 2 is a schematic diagram of another embodiment of a a long haul optical communication system of the present invention that includes a single U-
  • Figure 3 is a schematic diagram of a multi-channel optical add-drop multiplexer (OADM) that is used in place of the optical splitter and optical filters of Figure 2.
  • Figure 4 is a schematic diagram of another embodiment of a a long haul optical communication system of the present invention that includes forward- error-correction (FEC) circuits at the transmitter and receiver sections.
  • OADM optical add-drop multiplexer
  • FEC forward- error-correction
  • Figure 5 is a schematic diagram of another embodiment of a a long haul optical communication system of the present invention that includes FEC circuits that operate lower speeds than the Figure 3 embodiment.
  • split wave methods and apparatus are provided for transmitting data in optical fiber systems, including but not limited to long haul optical fiber systems.
  • an optical communication system 10 includes an optical-to-electronic converter 12 and an electronic demultiplexer 14 that is configured to receive and split an optical input 16 into a plurality of sub-wavelengths 18.
  • Optical input 16 has a first data rate.
  • a plurality of optical transmitters 20 is coupled to electronic demultiplexer 14.
  • Electronic demultiplexer 14 can be a conventional time- division demultiplexer. Any number of optical transmitters 20 can be utilized, however, the number is optimized such that the physical space due to multiple transmitters can be minimized. Because the wavelength spacing between sub- wavelengths 18 can become very small, suitable optical transmitters 20 can include precise wavelength lockers to minimize or eliminate sub-wavelength drift due to changes in operation environment.
  • Optical transmitters 20 transmit sub-wavelengths 18. Sub-wavelengths 18 are wavelength spaced sufficiently close with respect to each other to provide that the combined spectral efficiency for all sub-wavelengths 16 is close to or greater than the spectral efficiency of optical input 16.
  • An optical multiplexer or coupler 22 transmits sub- wavelengths to an optical fiber 24 which can be a- any form of single mode optical fibers, including but not limited to SMF-28, truewave, LEAF and the like.
  • Optical multiplexer or coupler 22 combines all sub-wavelengths 18 and launches them together into optical fiber 24.
  • N sub-wavelengths 16 there are N optical receivers 28 and an N:l electronic multiplexer 30, and a 1 :N electronic demultiplexer 14. If conventional baseband NRZ or RZ modulation is used, N optical transmitters 20 are provided.
  • number of sub-wavelengths 16 is in the range of 4 to 32, and 4 to 16.
  • a total bandwidth occupied by sub-wavelength 16 can be within the same ITU window (grid) of optical input 16. Additionally, the total bandwidth occupied by sub-wavelengths 16 can be close to or less than the bandwidth occupied by optical input 16.
  • the total bandwidth occupied by sub-wavelengths 16 is about 5 times or less than the bandwidth occupied by optical input 16.
  • An optical demultiplexer or coupler 26 receives sub-wavelengths 16 from optical fiber 24 and passes them to a plurality of optical receivers 28.
  • Suitable optical demultiplexers 26 include but are not limited to array- waveguide demultiplers based on silicon, or bulk grating-based demultiplexers.
  • Suitable couplers 26 include but are not limited to fused fiber couplers, silicon- on-silica couplers, and the like. Transmitters 28 can be tunable or non-tunable.
  • An electronic multiplexer 30, at the receiving end, can be included and positioned to receive sub-wavelengths 18 from receivers 28.
  • Electronic multiplexer 30 converts data rates of sub- wavelengths 16 back to the first data rate of optical input 16.
  • different data rates can be utilized including but not limited to those listed in the following table which illustrates how an original high-speed data is split into different lower data-rate signals.
  • a long haul optical communication system 110 includes an optical-to-electronic converter 112 and an electronic demultiplexer 114.
  • An optical transmitter 116 that has a common optical carrier, is coupled to electronic demultiplexer 114.
  • optical transmitter 116 uses optical demultiplexing to split an optical input 117 into multiple sub-wavelengths 118.
  • neither multiple optical transmitters, nor multiplexer/coupler are required at the transmitting end.
  • a continuous-wave optical carrier can be sent through an external modulator.
  • the multiple demultiplexed electronic signals are then used to modulate the external modulator and sub-wavelengths 118 are generated at the output of the external modulator.
  • Sub- wavelengths 118 have the same characteristics as sub-wavelengths 16 described above.
  • An optical fiber 120 couples transmitter 116 to an optical demultiplexer or splitter, and then to an array of optical filters 122.
  • Each optical filter 122 is preferably narrow enough to extract each individual sub-wavelength 118 and sharp enough to minimize or avoid the crosstalk coming from adjacent channels.
  • An alternative to optical filters 122 in combination with optical splitter is to use a multi-channel optical add-drop multiplexer (OADM), which can drop each individual sub-wavelength 118 in serial as illustrated in Figure 3.
  • OADM optical add-drop multiplexer
  • optical fiber 120 has the same characteristics as optical fiber 24 described above.
  • a plurality of receivers 124 are positioned to receive sub-wavelengths 118 from electronic multiplexer or filter array 122.
  • An electronic multiplexer 128 can be included and positioned to receive sub- wavelengths 118 from transmitters 124.
  • Electronic multiplexer 128 converts data rates of sub-wavelengths 118 back to the original data rate of optical input 118.
  • Systems 10 and 110 significantly increase the non-dispersion shifted conventional single mode fiber transmission distance, by way of illustration and without limitation for example, beyond 700 Ion of a 10 Gb/s system, without using dispersion compensation devices.
  • Systems 10 and 110 employ a small number of lower speed optical transmitters 20 and 116 to transport sub- wavelengths 18 and 118 in parallel rather than using a single high-speed optical transmitter.
  • Optical transmitters 20 and 116 are closely spaced in wavelength for a number of reasons. If the bandwidth occupied by optical transmitters 20 and 116 is too large then there is a waste of bandwidth.
  • the channel spacing is decreased to 10 GHz, then the total bandwidth decreases to only 30 GHz.
  • Transmitters 20 and 116 can use U-DWDM wavelengths as disclosed in U.S. patent applications nos. 703 and the last one, that are spaced sufficiently close to each other to decrease the bit skew due that results with parallel transmission at different wavelengths. If the wavelength spacing of the parallel bits is not small enough, then skew can become a problem in a long long-haul transmission system due to fiber chromatic dispersion. For example, if four channels are spaced by 0.8 nm, for a standard ITU grid, the total skew after
  • 3000 km transmission through a conventional single-mode fiber can be as high as about 120 ns.
  • the total skew is decreased by ten times to only about 12 ns.
  • a 40 Gb/s signal can be split into four 10 Gb/s transmission, or sixteen 2.5 Gb/s transmission.
  • a 40 Gb/s channel occupies a bandwidth of -80 GHz; four 20 GHz-spaced 10 Gb/s channel also occupy a bandwidth of -80 GHz. Sixteen 4.5 GHz-spaced 2.5 Gb/s occupy about 72 GHz which can still be within a 100 GHz ITU window. The total bandwidth is for all three examples in this paragraph.
  • a lower data rate channel including but not limited to 2.5 Gb/s, can tolerate a much higher fiber dispersion.
  • the maximum dispersion-limited transmission distance is inversely proportional to the square of data bit rate.
  • a 2.5 Gb/s data rate channel can transmit through a distance that is 16 times longer than a 10 Gb/s data rate channel.
  • FEC circuit chips are utilized. FEC chips are utilized to improve the bit-error- rate performance and increase the transmission distance of systems of the present invention. In one specific embodiment, the bit-error-rate performance is improved from 10 "4 to 10 ⁇ n .
  • another embodiment of the present invention is an optical communication system 210 that includes a demultiplexer 212 which receives an optical input 214, a plurality of U-DWDM optical transmitters 216 coupled to a plurality of multiplexers 218 and a plurality of FEC circuits 220.
  • the number of transmitters 216, multiplexers 218 are FEC circuits 220 is selected.
  • FEC circuits 220 are used to increase transmission distance and to make system 210 more robust by improving the error-rate performance.
  • FEC circuits 220 split the original data rate of optical input 214 into lower data rates.
  • FEC circuits 220 provide split-wave methodology in electronics and use coding technology.
  • Optical fiber 226 is coupled to optical demultiplexer or decoupler 228 which in turn sends sub-wavelengths 224 to a plurality of optical receivers 230.
  • a demultiplexer 232 converts data rates of sub-wavelengths 224 back to the original data rate of optical input 214.
  • An electronic multiplexer 234 is coupled to receivers 230 and a plurality of FEC circuits 236 are coupled to demutiplexer 232 and demultiplexers 234.
  • FEC circuits 220 at the transmitting end of system 210 are encoders while FEC circuits 220 at the the receiving end are decoders.
  • the bit-error-rate of system 210 can be 10 "14 to 10 "15 after FEC circuits 220 at the receiving end.
  • an optical communication system 210 includes a demultiplexer 312 that receives and splits an optical input 314 into a plurality of sub-wavelengths 316.
  • a plurality of FEC circuits 318 and U-DWDM transmitters 320 are included.
  • An optical multiplexer or coupler 322 is coupled to transmitters 320 and an optical fiber 324.
  • an optical demultiplexer or decoupler 328 is coupled to optical fiber 324 and a plurality of optical receivers 330.
  • a multiplexer 332 converts data rates of sub- wavelengths 316 back to the original data rate of optical input 314.
  • a plurality of FEC circuits 334 are coupled to multiplexer 332 and receivers 330
  • closed spaced sub- wavelengths can be produced with the use of an optical comb, as more fully disclosed in U.S. Patents Nos. 6,163,553 and 6,008931, both incorporated herein by reference
  • the optical combs can be utilized in combination with an array of narrowband optical filters to filter out each comb.
  • An array of external modulators is provided to respectively modulate the array of combs.

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

Abstract

L'invention concerne un procédé permettant de transmettre des signaux optiques dans un système de communication optique. Une entrée optique est reçue. Cette entrée a un premier débit binaire et est divisée en plusieurs sous-longueurs d'ondes qui sont espacées de manière suffisamment proches en longueur d'onde de telle manière que l'efficacité spectrale de toutes les sous-longueurs d'ondes est proche ou supérieure à l'efficacité spectrale de l'entrée optique. Ensuite, ces différentes sous-longueurs d'ondes sont combinées.
PCT/US2002/004676 2001-01-09 2002-01-09 Procede de division d'ondes et appareil permettant la transmission de donnees dans des systemes de fibres optiques longue portee WO2002058301A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002251975A AU2002251975A1 (en) 2001-01-09 2002-01-09 Split wave method and apparatus for transmitting data in long-haul optical fiber systems

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US26069601P 2001-01-09 2001-01-09
US60/260,696 2001-01-09
US34678602P 2002-01-07 2002-01-07
US60/346,786 2002-01-07

Publications (3)

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WO2002058301A2 true WO2002058301A2 (fr) 2002-07-25
WO2002058301A8 WO2002058301A8 (fr) 2003-02-13
WO2002058301A3 WO2002058301A3 (fr) 2003-07-24

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WO (1) WO2002058301A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9054832B2 (en) 2009-12-08 2015-06-09 Treq Labs, Inc. Management, monitoring and performance optimization of optical networks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696614A (en) * 1993-08-10 1997-12-09 Fujitsu Limited Optical wavelength multiplex transmission method and optical dispersion compensation method
US5710650A (en) * 1996-03-14 1998-01-20 Alcatel Network Systems, Inc. Dispersion-reducing multiple wavelength division multiplexing optical fiber transceiver and methods for using and assembling same
US5784184A (en) * 1995-05-11 1998-07-21 Ciena Corporation WDM Optical communication systems with remodulators and remodulating channel selectors
US5938309A (en) * 1997-03-18 1999-08-17 Ciena Corporation Bit-rate transparent WDM optical communication system with remodulators
DE19828614A1 (de) * 1998-06-26 1999-12-30 Ams Optotech Vertrieb Gmbh Verfahren und Vorrichtung zur optischen Datenübertragung über Lichtwellenleiter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696614A (en) * 1993-08-10 1997-12-09 Fujitsu Limited Optical wavelength multiplex transmission method and optical dispersion compensation method
US5784184A (en) * 1995-05-11 1998-07-21 Ciena Corporation WDM Optical communication systems with remodulators and remodulating channel selectors
US5710650A (en) * 1996-03-14 1998-01-20 Alcatel Network Systems, Inc. Dispersion-reducing multiple wavelength division multiplexing optical fiber transceiver and methods for using and assembling same
US5938309A (en) * 1997-03-18 1999-08-17 Ciena Corporation Bit-rate transparent WDM optical communication system with remodulators
DE19828614A1 (de) * 1998-06-26 1999-12-30 Ams Optotech Vertrieb Gmbh Verfahren und Vorrichtung zur optischen Datenübertragung über Lichtwellenleiter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9054832B2 (en) 2009-12-08 2015-06-09 Treq Labs, Inc. Management, monitoring and performance optimization of optical networks
US10630418B2 (en) 2009-12-08 2020-04-21 Snell Holdings, Llc Optical subchannel routing, protection switching and security
US10972209B2 (en) 2009-12-08 2021-04-06 Snell Holdings, Llc Subchannel photonic routing, switching and protection with simplified upgrades of WDM optical networks

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Publication number Publication date
WO2002058301A8 (fr) 2003-02-13
WO2002058301A3 (fr) 2003-07-24
AU2002251975A1 (en) 2002-07-30

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