WO2017098230A1 - Système de transmission optique - Google Patents

Système de transmission optique Download PDF

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Publication number
WO2017098230A1
WO2017098230A1 PCT/GB2016/053839 GB2016053839W WO2017098230A1 WO 2017098230 A1 WO2017098230 A1 WO 2017098230A1 GB 2016053839 W GB2016053839 W GB 2016053839W WO 2017098230 A1 WO2017098230 A1 WO 2017098230A1
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WO
WIPO (PCT)
Prior art keywords
optical
pumping
amplifier
link
optically pumped
Prior art date
Application number
PCT/GB2016/053839
Other languages
English (en)
Inventor
Do-Il Chang
Herve Fevrier
Original Assignee
Xtera Communications, Inc.
Combes, David
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 Xtera Communications, Inc., Combes, David filed Critical Xtera Communications, Inc.
Publication of WO2017098230A1 publication Critical patent/WO2017098230A1/fr

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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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form

Definitions

  • This disclosure relates generally to optical networks. More specifically, this disclosure relates to an optical transmission system that allows maximization of transmission capacity by wiring additional optical fibers.
  • Optical communication networks are often used to transport large amounts of data over long distances very quickly. At present, sophisticated optical communication networks are capable of transmitting tens of trillions of bits of information per second over a single optical fiber spanning many hundreds of kilometers. Optical communication networks generally exceed the bandwidth capabilities of copper networks. As a result, optical networks are often part of wireline telecommunication networks and are often used to provide optical backbones at the cores of the telecommunication networks.
  • An “unrepeatered” optical communication link refers to an optical link in which active optical repeaters are not used.
  • An active optical repeater is a device that receives optical signals, amplifies and equalizes the optical signals, and transmits the amplified and equalized optical signals, where the optical repeater includes one or more electrical components.
  • Conventional unrepeatered optical networks often use remote optically pumped amplifiers ("ROPAs") to amplify optical signals as the optical signals traverse the optical links.
  • ROPAs remote optically pumped amplifiers
  • a system comprising: an optical link comprising (i) an optical fiber configured to transport optical signals between first and second endpoints or terminals and (ii) an amplifier configured to amplify the optical signals; and a pumping link comprising an additional optical fiber configured to transport pumping light from the first endpoint or terminal to the amplifier.
  • the additional optical fiber may be a pumping fiber.
  • the term pumping fiber may refer to an optical fiber using to transport pumping light for an amplifier but not optical signals used for communication.
  • the pumping link may comprise one of multiple pumping links.
  • the amplifier may comprise a remote optically pumped amplifier.
  • the remote optically pumped amplifier may comprise a backward remote optically pumped amplifier.
  • the system may further comprise a second optical link comprising (i) a second optical fiber configured to transport second optical signals between the first and second endpoints or terminals and (ii) a second amplifier configured to amplify the second optical signals; and a second pumping link comprising a second additional optical fiber configured to transport second pumping light from the second endpoint or terminal to the second amplifier.
  • the second additional optical fiber may be a pumping fiber.
  • the second pumping link may comprise one of multiple (similar) second pumping links.
  • the second amplifier may comprise a remote optically pumped amplifier.
  • the second remote optically pumped amplifier may comprise a backward remote optically pumped amplifier.
  • the optical link may have a capacity that is at least about 40% higher compared to a capacity of the optical link without the pumping light from the pumping link.
  • the optical link may comprise a single-span unrepeatered optical link.
  • a method for optical communication comprising: transporting optical signals between first and second endpoints or terminals over an optical fiber of an optical link; amplifying the optical signals using an amplifier of the optical link; and transporting pumping light from the first endpoint or terminal to the amplifier using a pumping link comprising an additional optical fiber.
  • the additional optical fiber may be a pumping fiber.
  • Transporting the pumping light from the first endpoint or terminal to the amplifier may comprise using multiple pumping links.
  • the amplifier may comprise a remote optically pumped amplifier.
  • the remote optically pumped amplifier may comprise a backward remote optically pumped amplifier.
  • the method may further comprise transporting second optical signals between the first and second endpoints or terminals over a second optical fiber of a second optical link; amplifying the second optical signals using a second amplifier of the second optical link; and transporting second pumping light from the second endpoint or terminal to the second amplifier using a second pumping link comprising a second additional optical fiber.
  • the second additional optical fiber may be a pumping fiber.
  • Transporting the second pumping light from the second endpoint or terminal to the second amplifier may comprise using multiple second pumping links.
  • the second amplifier may comprise a second remote optically pumped amplifier.
  • the second remote optically pumped amplifier may comprise a backward remote optically pumped amplifier.
  • the optical link may have a capacity that is at least about 40% higher compared to a capacity of the optical link without the pumping light from the pumping link.
  • the optical link may comprise a single-span unrepeatered optical link.
  • FIGURE 1 illustrates one example of a standard unrepeatered optical link, where the optical link includes a single fiber pair;
  • FIGURE 2 illustrates a standard unrepeatered optical system using a backward ROPA
  • FIGURE 3 illustrates an example system in which one additional "pumping" fiber is used with the ROPA
  • FIGURE 4 illustrates an example system supporting bi-directional communication, where one additional pumping fiber is used at each end of the system
  • FIGURE 5 illustrates an example system in which two additional pumping fibers are used with the ROPA.
  • Span Loss (dB) Fiber Lineic Loss (dB/km) x Distance (km)
  • the transmission distance is often a primary goal due to geography - namely, unrepeatered optical links are often used between islands or between a mainland and an island.
  • the total cost of an unrepeatered system is typically a combination of the installation cost, the cost for the optical cables and in-line remote optically pumped amplifiers ("ROPAs"), and the cost of endpoint or terminal equipment.
  • the cost for the optical cables and in-line ROPAs depends on the number of fiber pairs and the number of ROPAs used.
  • FIGURE 1 illustrates one example of a standard unrepeatered optical link 100, where the optical link 100 includes a single fiber pair 101 , with first terminal equipment 102a and second terminal equipment 102b, respectively at a western end and eastern end of the link 100.
  • Each of the first and second terminal equipment 102a, 102b includes an interface card 103, multiplexing equipment 104, demultiplexing equipment 105, transmit optical amplifier 106, and receive optical amplifier 107.
  • the fiber pair 101 are comprised as part of an optical cable 1 10.
  • One fiber of the fibre pair 101 carries a multiplexed signal from west to east, and the other fibre carries a similar signal from east to west.
  • Each interface card 103 comprises N pairs of transmit channels 108 and receive channels 109.
  • the transmit channels 108 are each connected to multiplexing equipment 104, which multiplexes the signals from the transmit channels 108, and communicates the multiplexed signal to the transmit optical amplifier 106 for communication through the optical cable 1 10.
  • the receive channels 109 are each connected to demultiplexing equipment 105, which demultiplexes the signals from the receive optical amplifier 107, which in turn receives a multiplexed signal from the optical cable 1 10.
  • additional optical fiber(s) can be used between the endpoints or terminals and the ROPAs for an unrepeatered optical link.
  • additional optical fibers do not extend completely between the endpoints or terminals. This approach is described by comparing three unrepeatered optical systems and analyzing their performance.
  • FIGURE 2 illustrates a standard unrepeatered optical system 200 using a backward ROPA 210.
  • the system 200 comprises a first optical amplifier 201 with a pre- dispersion compensation unit 202, a forward pumping module 203, first line fibre span 204, backward ROPA 210, second line fibre span 205, backward pumping module 206 and second optical amplifier 207.
  • the signal propagates from left (west) to right (east) in this example .
  • the first optical amplifier 201 may be at a first terminal 240 or endpoint, and the second optical amplifier 207 may be at a second terminal 245 or endpoint.
  • the backward and forward pumping modules 203, 206 may similarly be at endpoints (e.g. comprising part of terminal equipment).
  • the ROPA 201 is referred to as "backward” since the ROPA 201 provides amplification based on pump energy flowing opposite to the direction of optical communication in the optical link (received from the backward pumping module 206).
  • the backward pumping module 206 may also provide Raman amplification in the second line fibre span 205 and optionally in the first line fibre span 204.
  • the forward pumping module 203 may provide Raman amplification in the first and/or second line fibre span 204, 205.
  • FIGURE 3 illustrates an example system 250 according to an embodiment, which includes the same features as in FIGURE 2, and in which one additional "pumping" fiber 215 is used with the ROPA 205.
  • the pumping fiber 215 is provided with optical power by backward pumping module 216.
  • a pumping fiber refers to an optical fiber used to transport pumping light for an amplifier but not optical signals used for communication.
  • the backward optical pumping module 216 may be at an endpoint or terminal.
  • the pumping fiber 215 here extends from one endpoint or terminal 245 to the ROPA 210.
  • the pumping fiber 215 does not extend across the entire span between the two endpoints or terminals 240, 245, so is more economic than providing additional fibres over the entire span.
  • FIGURE 3 illustrates communication in one direction.
  • FIGURE 4 illustrates an example system 260, supporting bi-directional communication, where one additional pumping fiber is used at each end of the system.
  • the system 260 is essentially a pair of systems 250 in accordance with FIGURE 3, one system 250 communicating from west to east, and the other communicating from east to west.
  • the system uses three optical fibers at each end of the system, rather than a single fiber pair as used in the conventional system.
  • the third fiber at each end simply denotes a pumping fiber that extends to the adjacent ROPA 216 without extending across the entire span between the endpoints or terminals 240, 245 (at the location of the amplifiers 202, 207).
  • FIGURE 5 illustrates an example system in which two additional pumping fibers 215, 225 are used to provide the ROPA 210 with optical power.
  • a pumping module 216 is provided to supply optical power to the ROPA 210 via pumping fiber 215, and a further pumping module 226 is provided to supply optical power to the ROPA 210 via pumping fiber 225.
  • Each pumping fiber 215, 225 here extends from one endpoint or terminal 240, 245 (housing the pumping modules 215, 216) to the adjacent ROPA 210 without extending across the entire span between the two endpoints or terminals 240, 245.
  • the same arrangement can be duplicated and reversed to support bi-directional communication similar to what was done in FIGURE 4. Note that while one or two pumping fibers are used with each ROPA above, any number of pumping fibers could be used with each ROPA.
  • ROPAs can be designed based on characteristics such as fiber length and location along an optical link, so assume the ROPAs are optimized in each particular installation.
  • distributed Raman pumps such as the NU-WAVE OPTIMA platform from XTERA COMMUNICATIONS, INC.
  • OSNR target optical signal-to- noise ratio
  • the system shown in FIGURE 2 could support eight 100G channels at 100GHz spacing (with the ROPA at 363km), the system shown in FIGURE 3 could support 17 100G channels at 50GHz spacing (with the ROPA at 350km) , and the system shown in FIGURE 5 could support 25 100G channels at 50GHz spacing (with the ROPA at 344km).
  • FOM Total Capacity x Distance / Number of Fiber Pairs per Direction
  • the FOM equals 0.4 Pb/s x km/fiber.
  • the FOM equals 0.567 Pb/s x km/fiber, which represents an improvement of approximately 40%.
  • the FOM equals 0.625 Pb/s x km/fiber, which represents an improvement of approximately 56%.
  • one or more optical links are added to each side of the systems, but those links are pumping links only and not used to transport any optical data traffic (or any significant amount of optical data traffic).
  • the use of these pumping links helps to greatly increase the capacity of the optical links that are transporting optical data traffic.
  • this can be accomplished without requiring that an additional optical link be installed across the entire span between two endpoints or terminals. Rather, each additional pumping link need only be installed to the adj acent ROPA, helping to reduce material, installation, and maintenance costs.
  • the term “or” is inclusive, meaning and/or.
  • the phrase “associated with,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like.
  • phrases "at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed.
  • “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

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

Abstract

L'invention concerne un système comprenant une liaison optique (250) comprenant (i) une fibre optique (204) configurée pour transporter des signaux optiques entre des premier et second points d'extrémité ou de terminaux et (ii) un amplificateur (210) configuré pour amplifier les signaux optiques ; et une liaison de pompage comprenant une fibre optique de pompage (215) configurée pour transporter une lumière de pompage du premier point d'extrémité ou terminal, à l'amplificateur (210).
PCT/GB2016/053839 2015-12-07 2016-12-06 Système de transmission optique WO2017098230A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201562264211P 2015-12-07 2015-12-07
US62/264,211 2015-12-07

Publications (1)

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WO2017098230A1 true WO2017098230A1 (fr) 2017-06-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4262109A1 (fr) * 2022-04-12 2023-10-18 Adtran Networks SE Liaison de communication optique avec amplificateur à pompage optique distant
WO2024088645A1 (fr) * 2022-10-28 2024-05-02 British Telecommunications Public Limited Company Réseau d'accès de télécommunications amélioré

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5321707A (en) * 1992-07-27 1994-06-14 General Instrument Corporation Remote pumping for active optical devices
WO2000070797A1 (fr) * 1999-05-13 2000-11-23 Litton Systems, Inc. Telemetrie tout optique longue distance pour capteur a fibres optiques, dans laquelle des amplificateurs a fibre dopee a l'erbium, et a pompage optique a distance sont utilises
EP1519502A1 (fr) * 2003-09-25 2005-03-30 Alcatel Réseau passif à multiplexage par répartition en longueur d'onde avec amplification individuelle des canaux
US20080152352A1 (en) * 2006-12-21 2008-06-26 Mpb Communications Inc. Inline pump sharing architecture for remotely-pumped pre- and post-amplifiers
US20100209117A1 (en) * 2009-02-13 2010-08-19 Xtera Communications, Inc. Optical communication using shared optical pumps

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5321707A (en) * 1992-07-27 1994-06-14 General Instrument Corporation Remote pumping for active optical devices
WO2000070797A1 (fr) * 1999-05-13 2000-11-23 Litton Systems, Inc. Telemetrie tout optique longue distance pour capteur a fibres optiques, dans laquelle des amplificateurs a fibre dopee a l'erbium, et a pompage optique a distance sont utilises
EP1519502A1 (fr) * 2003-09-25 2005-03-30 Alcatel Réseau passif à multiplexage par répartition en longueur d'onde avec amplification individuelle des canaux
US20080152352A1 (en) * 2006-12-21 2008-06-26 Mpb Communications Inc. Inline pump sharing architecture for remotely-pumped pre- and post-amplifiers
US20100209117A1 (en) * 2009-02-13 2010-08-19 Xtera Communications, Inc. Optical communication using shared optical pumps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GAINOV ET AL.: "Record 500 km unrepeatered 1 Tbit/s (10x100G) transmission over an ultra-low loss fiber", OPTICS EXPRESS, vol. 22, no. 19, 2014, OPTICAL SOCIETY OF AMERICA, pages 22308 - 22313

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4262109A1 (fr) * 2022-04-12 2023-10-18 Adtran Networks SE Liaison de communication optique avec amplificateur à pompage optique distant
WO2024088645A1 (fr) * 2022-10-28 2024-05-02 British Telecommunications Public Limited Company Réseau d'accès de télécommunications amélioré

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