WO2013128929A1 - Système de transport optique et procédé de transport optique - Google Patents

Système de transport optique et procédé de transport optique Download PDF

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Publication number
WO2013128929A1
WO2013128929A1 PCT/JP2013/001219 JP2013001219W WO2013128929A1 WO 2013128929 A1 WO2013128929 A1 WO 2013128929A1 JP 2013001219 W JP2013001219 W JP 2013001219W WO 2013128929 A1 WO2013128929 A1 WO 2013128929A1
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WIPO (PCT)
Prior art keywords
signal light
optical transmission
chromatic dispersion
amount
transmission system
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PCT/JP2013/001219
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English (en)
Japanese (ja)
Inventor
俊治 伊東
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日本電気株式会社
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Publication of WO2013128929A1 publication Critical patent/WO2013128929A1/fr

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    • 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
    • H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
    • 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
    • H04B10/2581—Multimode transmission

Definitions

  • the present invention relates to an optical transmission system and an optical transmission method, and more particularly to an optical transmission system and an optical transmission method using a multi-core optical fiber as a transmission path.
  • spatial multiplexing technology is attracting attention.
  • This “spatial multiplexing” technique has a plurality of methods.
  • a “mode multiplexing” method that uses each waveguide mode of a multimode fiber independently, and a “core multiplexing” method that uses each core of a multicore optical fiber having a plurality of cores in one fiber independently For example, see Patent Document 1 and Non-Patent Document 1).
  • a transmission capacity exceeding 100 terabits / second per fiber has been achieved.
  • a multi-core optical fiber having N cores is used, so that the transmission capacity per optical fiber can be increased N times.
  • signal quality deteriorates due to crosstalk generated between cores.
  • a crosstalk of about ⁇ 20 dB occurs after 2 km transmission. Due to this crosstalk, signal quality deteriorates in an optical transmission system using a related multi-core optical fiber.
  • An object of the present invention is to provide an optical transmission system and an optical transmission method that solve the above-described problem that it is difficult to perform large-capacity transmission capable of obtaining good signal quality in an optical transmission system using a multi-core optical fiber. Is to provide.
  • An optical transmission system includes a multiplexed optical transmission path configured to include a plurality of optical transmission paths that are close to each other, a plurality of relay apparatuses that connect the plurality of multiplexed optical transmission paths, and a wavelength that is connected to the relay apparatus.
  • a dispersion adding device the relay device passes the first signal light, inserts the second signal light into the multiplexed optical transmission line, and the chromatic dispersion adding device has the first signal light possessed by the first signal light.
  • the chromatic dispersion compensation amount for one of the first signal light and the second signal light so that the chromatic dispersion amount of 1 and the second chromatic dispersion amount of the second signal light are substantially the same. Is added.
  • the first signal light is allowed to pass through a multiplexed optical transmission line including a plurality of optical transmission lines adjacent to each other, and the second signal light is inserted into the multiplexed optical transmission line. Either the first signal light or the second signal light so that the first chromatic dispersion amount of the first signal light and the second chromatic dispersion amount of the second signal light are substantially the same. In contrast, a chromatic dispersion compensation amount is added.
  • optical transmission system and the optical transmission method of the present invention it is possible to realize large-capacity transmission capable of obtaining good signal quality in an optical transmission system using a multi-core optical fiber.
  • FIG. 1 is a block diagram illustrating a configuration of an optical transmission system according to a first embodiment of the present invention. It is a block diagram which shows the structure of the evaluation experiment system for evaluating the signal quality degradation amount generate
  • FIG. 1 is a block diagram showing a configuration of an optical transmission system 100 according to the first embodiment of the present invention.
  • the optical transmission system 100 includes a multiplexed optical transmission line 110, a plurality of relay apparatuses 120 that connect a plurality of multiplexed optical transmission lines, and a chromatic dispersion adder 131 (132) connected to the relay apparatus 120.
  • the multiplexed optical transmission line 110 includes a plurality of optical transmission lines that are close to each other.
  • a multi-core optical fiber that includes a plurality of cores constituting the optical transmission line in one optical fiber can be used.
  • the relay device 120 passes the first signal light S10 and inserts the second signal light S21 (S22) into the multiplexed optical transmission line 110.
  • a reconfigurable optical add / drop multiplexer ROADM
  • ROADM reconfigurable optical add / drop multiplexer
  • the chromatic dispersion adder 131 (132) is configured so that the first chromatic dispersion amount of the first signal light S10 and the second chromatic dispersion amount of the second signal light S21 (S22) are substantially the same.
  • a chromatic dispersion compensation amount is added to one of the first signal light S10 and the second signal light S21 (S22).
  • the chromatic dispersion adding device 131 can be configured to provide the first signal light S10 with the chromatic dispersion amount that compensates the first chromatic dispersion amount as the chromatic dispersion compensation amount.
  • the chromatic dispersion adding device 132 may be configured to provide the second signal light S21 (S22) with a chromatic dispersion amount substantially the same as the first chromatic dispersion amount as the chromatic dispersion compensation amount.
  • chromatic dispersion refers to a phenomenon in which the group velocity of an optical signal in an optical fiber changes as a function of the wavelength of the optical signal.
  • the chromatic dispersion is defined by a propagation time difference (unit: ps / nm / km or simply ps / nm) when two monochromatic lights having different wavelengths by 1 nm are propagated by 1 km. Therefore, in this specification, when chromatic dispersion is expressed by this propagation time difference, it is referred to as “a chromatic dispersion amount”.
  • the first chromatic dispersion amount is a chromatic dispersion amount (accumulated chromatic dispersion amount) accumulated while the first signal light S10 propagates through the multiplexed optical transmission line 110.
  • wavelength dispersion adding device 131 for example, various types of wavelength dispersion compensating devices such as a fiber Bragg grating (Fiber Bragg Grating FBG) type, a micro-optics type, a planar optical waveguide (Planar Lightwave Circuit: PLC) type, and the like are used. Can be used.
  • a fiber Bragg grating Fiber Bragg Grating FBG
  • a micro-optics type a planar optical waveguide (Planar Lightwave Circuit: PLC) type, and the like are used.
  • PLC Planar Lightwave Circuit
  • FIG. 1 shows the case where the chromatic dispersion adder 131 is arranged in the path of the first signal light S10 and the chromatic dispersion adder 132 is arranged in the path of the second signal light S21 (S22).
  • the chromatic dispersion adder 131 (132) may be disposed on at least one of the path of the first signal light S10 and the path of the second signal light S21 (S22).
  • the first chromatic dispersion amount of the first signal light S10 in the multiplexed optical transmission line 110 and the second signal light S21 (S22). ) can be made substantially the same. That is, the difference in chromatic dispersion amount (accumulated chromatic dispersion difference) accumulated by each signal light transmitted through each optical transmission line (core) of the multiplexed optical transmission line 110 can be made substantially zero. Thereby, degradation of signal quality due to crosstalk between optical transmission paths (cores) can be suppressed.
  • high-capacity transmission capable of obtaining good signal quality can be realized in an optical transmission system using a multi-core optical fiber. That is, in a transmission line using a multi-core optical fiber in which crosstalk can occur between cores, deterioration due to crosstalk can be minimized, and thereby the transmission distance can be extended.
  • each channel is based on a digital coherent transmission system suitable for high-speed / long-distance transmission. .
  • the difference in the accumulated chromatic dispersion amount between the main signal light and the interference signal light can be controlled. Therefore, when the magnitude of signal quality degradation due to the occurrence of crosstalk depends on the accumulated chromatic dispersion difference between the signal light and the interference signal light, the inter-core in the optical transmission system is controlled by controlling the accumulated chromatic dispersion difference. The resistance to crosstalk can be improved.
  • the inventors used the evaluation experiment system 200 shown in FIG. 2 to evaluate the influence of the accumulated chromatic dispersion difference between the main signal light and the interference signal light on the signal quality degradation amount.
  • the main signal light and the interference signal light are both 43 Gb / s DP-QPSK (Dual-Polarization Quadrature-Phase-Shift-Keying) signal light having the same wavelength.
  • the first optical transmitter 211 transmits main signal light
  • the second optical transmitter 212 transmits interference signal light.
  • the noise light from the noise light source 220 is added only to the path of the main signal light to reduce the optical SNR (Signal to Noise Ratio).
  • the optical SNR was set to 16 dB / 0.1 nm.
  • the accumulated chromatic dispersion difference is generated by inserting the chromatic dispersion adding device 230 into the path of the interference signal light and adding the chromatic dispersion to the interference signal light.
  • the optical receiver 240 receives the main signal light and the interference signal light.
  • FIG. 3 shows the measurement result of the bit error rate (BER) when the intensity ratio of the main signal light and the interference signal light is 16 dB.
  • the horizontal axis of the graph is the accumulated chromatic dispersion difference, and the vertical axis is the Q value converted from BER.
  • FIG. 4A and 4B show electric field trajectories in the QPSK signal light.
  • 4A shows the electric field locus when the residual chromatic dispersion amount is zero
  • FIG. 4B shows the electric field locus when the accumulated chromatic dispersion amount is 18,000 [ps / nm]. From these figures, when the accumulated chromatic dispersion is 18,000 [ps / nm] (FIG. 4B), distortion occurs due to the accumulated chromatic dispersion, and compared with the case where the residual chromatic dispersion is zero (FIG. 4A). It can be seen that the electric field amplitude is about 2.5 times larger at the maximum.
  • the electric field locus is composed of the sum of the electric fields of the main signal light and the interference signal light. Therefore, if the interference signal light has a large amplitude component due to the accumulation of chromatic dispersion, the probability of occurrence of a code error inevitably increases.
  • Fig. 5 shows the relationship between the accumulated chromatic dispersion amount and the maximum electric field amplitude. It can be seen from the figure that the maximum electric field amplitude monotonously increases until the accumulated chromatic dispersion amount is about 20,000 [ps / nm].
  • FIG. 3 shows only the measurement results up to the accumulated chromatic dispersion amount of about 5,000 [ps / nm]. From the results of FIG. 5, the accumulated chromatic dispersion amount is about 5,000 [ps / nm] or more. However, the amount of signal quality degradation is expected to increase monotonously.
  • the optical transmission system 100 of the present embodiment in order to minimize signal quality degradation due to crosstalk between cores, it is effective to suppress the difference in the accumulated chromatic dispersion amount between the signal lights where crosstalk occurs, preferably approximately zero. I know that there is.
  • the difference in the chromatic dispersion amount (accumulated chromatic dispersion difference) accumulated in each signal light transmitted through each optical transmission line (core) of the multiplexed optical transmission line 110 is substantially zero. It can be. Thereby, degradation of signal quality due to crosstalk between optical transmission paths (cores) can be suppressed.
  • high-capacity transmission capable of obtaining good signal quality can be realized in an optical transmission system using a multi-core optical fiber.
  • FIG. 6 is a block diagram showing a configuration of an optical transmission system 300 according to the second embodiment of the present invention.
  • the optical transmission system 300 includes multiple optical fiber transmission lines 311 to 314 as multiplexed optical transmission lines, a plurality of relay apparatuses 321 to 325 connecting a plurality of multiplexed optical transmission lines, and a wavelength dispersion adding apparatus 331 connected to the relay apparatus. 332.
  • five relay apparatuses (Node-1 to 5) are connected by four multi-optical fiber transmission lines (Span-1 to 4), and the first relay apparatus (Node-1) 321 is connected.
  • the first optical transmitter 341 is connected will be described.
  • the second optical transmitter 342 is connected to the third repeater (Node-3) via the chromatic dispersion adder 331, and the third optical transmitter 343 is connected to the fourth repeater via the chromatic dispersion adder 332. Connected to each relay device (Node-4).
  • a reconfigurable optical add / drop multiplexer can be used as the relay apparatuses 321 to 325.
  • ROADM reconfigurable optical add / drop multiplexer
  • the difference in the chromatic dispersion amount (accumulated chromatic dispersion) accumulated in each signal light transmitted through each of the multi-optical fiber transmission lines 311 to 314. (Difference) can be substantially zero.
  • the optical transmission system 300 has a configuration in which repeaters 321 to 325 connect a plurality of multi optical fiber transmission lines 311 to 314 in a straight line, and linear optical transmission using ROADMs.
  • the system is configured.
  • FIG. 6 shows a case where the optical transmission system 300 has a 5-node (Node-1 to 5) 4-span configuration.
  • each of the multi-optical fiber transmission lines 311 to 314 (span) configured by the multi-core optical fiber has chromatic dispersion amounts (Disp) D1 to D4.
  • the process of adding chromatic dispersion in advance to the signal light S31 that is the output light of the first optical transmitter 341 input to Node-1 is Not performed.
  • the signal light S31 arrives at the third repeater (Node-3) 323, it receives a total of D1 + D2 chromatic dispersion amounts from the multi-optical fiber transmission line and holds them as the accumulated chromatic dispersion amount.
  • the chromatic dispersion adder 331 connected to the third repeater (Node-3) 323 has the same amount of output light from the second optical transmitter 342 inserted (Add) in Node-3. Is added before being inserted into the multi-optical fiber transmission line.
  • FIG. 7 shows the relationship between the position in the optical transmission system 300 and the accumulated chromatic dispersion amount of each signal light at this time. As shown in the figure, the accumulated chromatic dispersion amounts of the signal light S31 and the signal light S32 are the same in Node-3.
  • the signal light S31 from Node-1 is dropped.
  • the signal light S32 from Node-3 passes through Node-4 while maintaining the accumulated chromatic dispersion amount of D1 + D2 + D3. Therefore, the chromatic dispersion adder 332 connected to the fourth repeater (Node-4) 324 has the same amount of wavelength as the output light from the third optical transmitter 343 inserted (Add) in Node-4. The amount of dispersion is added before being inserted into the multi-optical fiber transmission line. Thereafter, the signal light S33 is output to the multi-optical fiber transmission line. Also at this time, as shown in FIG. 7, the accumulated chromatic dispersion amounts of the signal light S32 and the signal light S33 are the same in Node-4.
  • the accumulated chromatic dispersion amounts possessed by the signal lights S31, S32, and S33 in the multi-optical fiber transmission lines 311 to 314 can be made substantially the same. . That is, the difference in the chromatic dispersion amount (accumulated chromatic dispersion difference) accumulated in each signal light transmitted through the multi-optical fiber transmission lines 311 to 314 can be made substantially zero. Thereby, degradation of signal quality due to crosstalk between optical transmission paths (cores) can be suppressed. As a result, according to the optical transmission system 300 of the present embodiment, high-capacity transmission capable of obtaining good signal quality can be realized in an optical transmission system using a multi-core optical fiber.
  • FIG. 8 is a block diagram showing a configuration of an optical transmission system 400 according to the third embodiment of the present invention.
  • the optical transmission system 400 has a configuration in which a plurality of multi-optical fiber transmission lines 411 to 415 are connected in a ring shape with repeaters 421 to 425, and is a second type in that a ring optical transmission system using ROADM is configured.
  • each relay apparatus Node-1 to 5
  • the multi-optical fiber transmission lines (Span-1 to 5) have chromatic dispersion amounts (Disp) D1 to D5, respectively.
  • the chromatic dispersion adders 431 to 434 connected to the Nodes 2 to 5 are substantially equal to the accumulated chromatic dispersion amount of the signal light passing through each Node in the output light from the optical transmitter inserted in each Node. The same amount of chromatic dispersion is added. Thereafter, the signal lights S42 to S45 are output.
  • the total chromatic dispersion amount of D1 + D2 + D3 + D4 is added to the multi-optical fiber transmission line for the output light inserted (Add) in Node-5. Need to be added before inserting into. Thereafter, the signal light S45 is output from Node-5 to the multi-optical fiber transmission line.
  • the signal light S45 receives the chromatic dispersion amount of D5 in the multi-optical fiber transmission line (Span-5) 415, and arrives at Node-1 as the signal light 46 having the total chromatic dispersion amount of D1 + D2 + D3 + D4 + D5 as the accumulated chromatic dispersion amount.
  • the chromatic dispersion adding device 435 connected to Node-1 adds a chromatic dispersion amount that compensates the chromatic dispersion amount possessed by the signal light S46. That is, the wavelength dispersion adding device 435 gives the signal light S46 a wavelength dispersion amount ( ⁇ (D1 + D2 + D3 + D4 + D5)) that is equal in magnitude to the accumulated wavelength dispersion amount held by the signal light S46 and has the opposite sign. Therefore, the accumulated chromatic dispersion amounts respectively possessed by the signal light inserted from Node-5 to Node-1 and the signal light newly inserted at Node-1 are substantially the same (zero).
  • FIG. 9 shows the relationship between the position in the optical transmission system 400 and the accumulated chromatic dispersion amount of each signal light. As shown in the figure, the accumulated chromatic dispersion amount of each signal light in Node-1 is the same.
  • the optical transmission system 400 of the present embodiment even if a ring optical transmission system is configured, the accumulated chromatic dispersion that each signal light has in each repeater (Node-1 to 5).
  • the amount can be substantially the same. That is, the difference in the chromatic dispersion amount (accumulated chromatic dispersion difference) accumulated in each signal light transmitted through each repeater can be made substantially zero. Thereby, degradation of signal quality due to crosstalk between optical transmission paths (cores) can be suppressed.
  • high-capacity transmission capable of obtaining good signal quality can be realized in an optical transmission system using a multi-core optical fiber.
  • the wavelength dispersion adding device is arranged immediately before being inserted into the multiplexed optical transmission line (multi-optical fiber transmission line).
  • the present invention is not limited to this, and any other arrangement configuration may be used as long as the accumulated chromatic dispersion amount is acquired before the signal light is inserted into the multiplexed optical transmission line.
  • Optical transmission system 110 Multiplexed optical transmission line 120, 321-325, 421-425 Repeater 131, 132, 230, 331, 332, 431-435 Wavelength dispersion adder 200 Evaluation experiment system 211, 341 First Optical transmitters 212 and 342 second optical transmitter 220 noise light source 240 optical receivers 311 to 314 and 411 to 415 multi-optical fiber transmission line S10 first signal light S21 and S22 second signal light S31 and S32, S33, S41 to S45 Signal light

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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

Selon la présente invention, dans un système de transport optique qui utilise une fibre optique multi-cœur, un transport de grande capacité dans lequel une qualité de signal supérieure est atteinte est difficile, et ainsi, le système de transport optique de la présente invention a des trajets de transport optique multiplexés configurés de manière à comprendre une pluralité de trajets de transport optique mutuellement adjacents, une pluralité de dispositifs relais reliant une pluralité de trajets de transport optique multiplexés, et des dispositifs supplémentaires à dispersion de longueur d'onde reliés aux dispositifs relais ; les dispositifs relais faisant passer une première lumière de signal afin d'insérer une seconde lumière de signal dans les trajets de transport optique multiplexés, et les dispositifs supplémentaires à dispersion de longueur d'onde ajoutant une quantité de compensation de dispersion de longueur d'onde à soit la première lumière de signal, soit la seconde lumière de signal de telle sorte qu'une première quantité de dispersion de longueur d'onde possédée par la première lumière de signal et la seconde quantité de dispersion de longueur d'onde possédée par la seconde lumière de signal sont sensiblement identiques.
PCT/JP2013/001219 2012-03-02 2013-02-28 Système de transport optique et procédé de transport optique WO2013128929A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017090622A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Système de communication et connecteur
WO2017090600A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Système de communication et connecteur
WO2017090608A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Nœud et système d'alimentation électrique optique

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JP2004266603A (ja) * 2003-03-03 2004-09-24 Fujitsu Ltd 波長多重光中継伝送方法および中継装置
JP2006100909A (ja) * 2004-09-28 2006-04-13 Nec Corp 波長分割多重光伝送システム、光送信装置、中継ノード及び波長分割多重光伝送方法
WO2009107414A1 (fr) * 2008-02-27 2009-09-03 古河電気工業株式会社 Système de transmission optique et fibre optique à plusieurs cœurs

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2004266603A (ja) * 2003-03-03 2004-09-24 Fujitsu Ltd 波長多重光中継伝送方法および中継装置
JP2006100909A (ja) * 2004-09-28 2006-04-13 Nec Corp 波長分割多重光伝送システム、光送信装置、中継ノード及び波長分割多重光伝送方法
WO2009107414A1 (fr) * 2008-02-27 2009-09-03 古河電気工業株式会社 Système de transmission optique et fibre optique à plusieurs cœurs

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017090622A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Système de communication et connecteur
WO2017090600A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Système de communication et connecteur
WO2017090608A1 (fr) * 2015-11-26 2017-06-01 日本電信電話株式会社 Nœud et système d'alimentation électrique optique
JPWO2017090600A1 (ja) * 2015-11-26 2018-05-17 日本電信電話株式会社 通信システム及びコネクタ
JPWO2017090608A1 (ja) * 2015-11-26 2018-05-31 日本電信電話株式会社 ノード及び光給電システム
JPWO2017090622A1 (ja) * 2015-11-26 2018-06-07 日本電信電話株式会社 通信システム及びコネクタ
CN108292955A (zh) * 2015-11-26 2018-07-17 日本电信电话株式会社 通信系统以及连接器
CN108292959A (zh) * 2015-11-26 2018-07-17 日本电信电话株式会社 节点以及光供电系统
CN108292956A (zh) * 2015-11-26 2018-07-17 日本电信电话株式会社 通信系统及连接器
EP3364568A4 (fr) * 2015-11-26 2019-05-29 Nippon Telegraph and Telephone Corporation Système de communication et connecteur
EP3364567A4 (fr) * 2015-11-26 2019-05-29 Nippon Telegraph and Telephone Corporation Système de communication et connecteur
US10527781B2 (en) 2015-11-26 2020-01-07 Nippon Telegraph And Telephone Corporation Communication system and connector
CN108292959B (zh) * 2015-11-26 2021-02-19 日本电信电话株式会社 节点以及光供电系统
CN108292956B (zh) * 2015-11-26 2021-04-27 日本电信电话株式会社 通信系统及连接器

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