WO2020024544A1 - Dispersion compensation device and method - Google Patents

Dispersion compensation device and method Download PDF

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Publication number
WO2020024544A1
WO2020024544A1 PCT/CN2018/123442 CN2018123442W WO2020024544A1 WO 2020024544 A1 WO2020024544 A1 WO 2020024544A1 CN 2018123442 W CN2018123442 W CN 2018123442W WO 2020024544 A1 WO2020024544 A1 WO 2020024544A1
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dcf
multiplexer
current
wavelength
dispersion
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PCT/CN2018/123442
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French (fr)
Chinese (zh)
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肖礼
乔立杰
付成鹏
张蔚青
陈志�
卜勤练
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武汉光迅科技股份有限公司
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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
    • H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
    • 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
    • H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
    • H04B10/25253—Arrangements 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
    • 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
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6161—Compensation of chromatic dispersion

Definitions

  • Embodiments of the present invention relate to the field of optical fiber communication technologies, and in particular, to a dispersion compensation device and method.
  • access points need to aggregate different long-distance business data to the local device and transmit it to the upper-level data center for communication. For example, some optical channels may be generated on the local device, and the remote distance is zero. Some optical channels may be generated ten kilometers away. They need to be connected to local equipment through optical fibers, multiplexed with local service data, and then transmitted to the upper-level data center.
  • Signals with different optical wavelengths transmit information through different optical channels. Differences in the distance of different optical channels cause differences in dispersion during the transmission of different optical channels. If the dispersion is large, the existing dispersion compensation methods are difficult to achieve accurate accuracy for all channels. Dispersion compensation.
  • the optical signal modulation method of PAM4 (Pulse Amplitude Modulation) format widely used in optical fiber access networks can only tolerate residual dispersion of about +/- 50ps / nm. If different optical wavelength channels (wavelength groups The difference in long-distance distances is 10 km. If calculated with a common single-mode fiber at 17 ps / nm / km, no matter how the dispersion compensation is performed in the link, all optical wavelength channels cannot meet the requirements of residual dispersion at the same time.
  • embodiments of the present invention provide a dispersion compensation device and method.
  • an embodiment of the present invention provides a dispersion compensation device, where the device includes:
  • Each multiplexer receives a signal from an upstream wavelength group, where:
  • the first multiplexer is used to multiplex the signals of the input upstream wavelength group and output a composite wave
  • the DCF located between each two multiplexers is used to perform dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and output to the next multiplexer connected to the current DCF;
  • Each subsequent multiplexer is used to multiplex the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation. To output a new synthetic wave.
  • an embodiment of the present invention provides a dispersion compensation method.
  • the method includes:
  • the first multiplexer multiplexes the signals of the input upstream wavelength group and outputs a composite wave
  • the DCF between each two multiplexers performs dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and outputs it to the next multiplexer connected to the current DCF;
  • Each subsequent multiplexer multiplexes the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation, Output a new synthetic wave.
  • dispersion compensation is performed on input signals of different wavelength groups through DCF between the multiplexers, which can equalize dispersion differences caused by different distances of different wavelength groups.
  • FIG. 1 is a schematic structural diagram of a dispersion compensation device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a dispersion compensation device according to another embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an apparatus including uplink dispersion compensation and downlink dispersion compensation according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a dispersion compensation method according to another embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a dispersion compensation device according to an embodiment of the present invention.
  • a dispersion compensation device provided by an embodiment of the present invention includes:
  • Each multiplexer receives a signal from an upstream wavelength group, where:
  • the first multiplexer is used to multiplex the signals of the input upstream wavelength group and output a composite wave
  • the DCF located between each two multiplexers is used to perform dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and output to the next multiplexer connected to the current DCF;
  • Each subsequent multiplexer is used to multiplex the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation. To output a new synthetic wave.
  • a cascaded DCF Dispersion Compensating Fiber
  • different degrees of dispersion compensation are performed for different wavelength groups of signals at different distances, which can balance different The dispersion of the wavelength group caused by different distances.
  • the embodiment of the present invention compensates for dispersion caused by signal transmission in an uplink optical fiber communication service.
  • the upstream optical fiber communication service is taken as an example.
  • the uplink channels in the overall wavelength division multiplexing bandwidth are divided into N groups (from wavelength group 1 to wavelength group N), and each wavelength group corresponds to a long to Short different fiber lengths.
  • An embodiment of the present invention provides N multiplexers, and sequentially receives signals input from N wavelength groups.
  • a section of DCF is inserted between each two multiplexers, which is used to perform dispersion compensation on signals input from different wavelength groups.
  • the composite wave signal is input to the first DCF, and the DCF performs dispersion compensation on the input signal and then inputs the second multiplex.
  • the second multiplexer multiplexes the signal input from wavelength group 2 and the signal input from multiplexer 1, and then inputs the new composite wave signal to the second DCF, and so on. 3.
  • the signals input from channels such as wavelength group 4 are multiplexed, and each segment of DCF compensates the difference in signal dispersion caused by the difference between the two adjacent wavelength groups due to different distances.
  • the uplink wavelength group is sorted according to the distance from the farthest to the nearest, and the central wavelength of the uplink wavelength group transmission signal is sorted from the shortest to the longest.
  • the implementation of the present invention allocates the relationship between the distance of the wavelength group and the wavelength of the wavelength group. Specifically, the shortest set of wavelengths (the central wavelength is ⁇ 1 ) is assigned to the longest distant distance wavelength group 1 (the distant distance is L 1 ), and the next shortest set of wavelengths (the central wavelength is ⁇ 2 ) Wavelength group 2 assigned to the second longest long distance (the long distance is L 2 ), and so on, and the long range of the uplink wavelength group is sorted from far to near, and the center wavelength of the transmission signal of the uplink wavelength group is short Sort long to long.
  • the length of the DCF between each two multiplexers is Among them, L a is the distance of the upstream wavelength group corresponding to the previous multiplexer connected to the current DCF, L b is the distance of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, ⁇ a Is the center wavelength of the transmission signal of the uplink wavelength group corresponding to the previous multiplexer connected to the current DCF, ⁇ b is the center wavelength of the transmission signal of the uplink wavelength group corresponding to the next multiplexer connected to the current DCF, and k is The ratio between DCF dispersion and transmission fiber dispersion, D is the average dispersion of the transmission band transmission fiber, and ⁇ D is the dispersion slope of the transmission fiber.
  • the implementation of the present invention can reasonably arrange the length of each segment of DCF according to the relationship between the distance of the wavelength group and the wavelength of the wavelength group.
  • the length of the DCF between the multiplexer 1 and the multiplexer 2 is (L 1 -L 2 ) / k- ⁇ D ⁇ L 2 ( ⁇ 2 - ⁇ 1 ) / D,
  • L 1 is the extended distance of uplink wavelength group 1
  • L 2 is the extended distance of uplink wavelength group 2
  • ⁇ 1 is the central wavelength of the transmission signal of uplink wavelength group 1
  • ⁇ 2 is the transmission signal of uplink wavelength group 2.
  • the central wavelength of k, k is the ratio between DCF dispersion and transmission fiber dispersion, D is the average dispersion of transmission fiber transmission fiber, ⁇ D is the dispersion slope of transmission fiber, where (L 1 -L 2 ) / k represents dispersion compensation, ⁇ D ⁇ L 2 ( ⁇ 2 - ⁇ 1 ) / D represents dispersion slope compensation.
  • the apparatus further includes:
  • An uplink preamplifier which is connected to the last multiplexer and is used to receive the composite wave output by the last multiplexer and perform power compensation on the received composite wave.
  • wavelength group 1 Due to the long-distance long-distance, multi-stage cascaded DCF, and multi-stage optical wavelength division multiplexing, wavelength group 1 experiences more additional insertion loss than wavelength group N.
  • one optical fiber is connected to the last multiplexer
  • the power amplifier can compensate the additional insertion loss by rationally setting the gain spectrum slope of the optical power amplifier after multiplexing, and realize power balance between different wavelength groups.
  • An embodiment of the present invention also provides a dispersion compensation device for downlink optical fiber communication services.
  • FIG. 2 is a schematic structural diagram of a dispersion compensation device according to another embodiment of the present invention.
  • the device further includes: a set of multiple demultiplexers arranged in sequence and a DCF located between every two demultiplexers, each demultiplexer outputs a signal of a downlink wavelength group, wherein:
  • Each demultiplexer is used to demultiplex the input signal, output signals corresponding to the downstream wavelength group, and send signals of other downstream wavelength groups to the DCF located between the current demultiplexer and the next demultiplexer;
  • the DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
  • the dispersion compensation configuration of the downlink service and the uplink service are basically symmetrical. Therefore, the functional structure of the dispersion compensation device for the downlink service and the dispersion compensation device for the uplink service is similar, and details are not described in the embodiment of the present invention.
  • a cascade dispersion compensation fiber is inserted between the optical channel demultiplexers of the remote access equipment, which can implement dispersion pre-compensation for optical wavelength signals at different distances.
  • the downlink wavelength group is sorted according to the distance from near to far, and the central wavelengths of the transmission signals of the downlink wavelength group are sorted from long to short.
  • the dispersion compensation configuration of the downlink service and the uplink service are basically symmetrical. Therefore, the allocation of the relationship between the distance of the downlink wavelength group and the wavelength of the downlink wavelength group is similar to that of the dispersion compensation device in the uplink service. To repeat.
  • the multiplexer and demultiplexer provided by the embodiment of the present invention is a wavelength division multiplexer (WDM).
  • WDM wavelength division multiplexer
  • the wavelength division multiplexer can be used as a multiplexer or a demultiplexer. use.
  • the embodiment of the present invention provides a simple structure of a dispersion compensation device, wherein the multiplexer, the demultiplexer, and the dispersion compensation fiber DCF are all passive components, which has low cost and high reliability.
  • the dispersion compensation device provided by the embodiment of the present invention is described in detail below with reference to FIG. 3.
  • FIG. 3 is a schematic structural diagram of a remote access device according to an embodiment of the present invention.
  • the remote access device includes a dispersion compensation device, a link power compensation module, and a link dispersion compensation module, where:
  • the dispersion compensation device includes: multiple uplink wavelength division multiplexers WDM, one DCF is connected between each two WDMs, the last WDM for uplink is connected to uplink preamplifier BA, and BA is connected to optical attenuation 1 , The optical attenuation 1 is connected to the link power compensation module;
  • the dispersion compensation device includes a plurality of downlink wavelength division multiplexers WDM, one DCF is connected between each two WDMs, the first downlink WDM is connected to a downlink post amplifier PA, and the PA is connected to optical attenuation 2.
  • Optical attenuation 2 is connected to the link power compensation module.
  • the link power compensation module is connected to the link dispersion compensation module.
  • the link power compensation module is used to perform the same power compensation on each uplink and downlink channel, and the link dispersion compensation module is used to perform the same dispersion compensation on each uplink and downlink channel.
  • the distance between wavelength group 1 and wavelength group 4 decreases in sequence
  • the wavelength of the transmitted optical signal increases in sequence
  • the dispersion difference of the channels in different wavelength groups can be reduced from the original 170ps / nm to 42.5 ps / nm, can meet the residual dispersion requirements of PAM4.
  • the composite wave output from the last uplink WDM is input to the BA.
  • the slope of the gain spectrum of the optical power amplifier BA By properly setting the slope of the gain spectrum of the optical power amplifier BA, power balance between different wavelength groups can be achieved. For example, due to the existence of long-distance long-distance, multi-volume DCF, and multi-level optical wavelength division multiplexing, wavelength group 1 experiences an additional 4-5 dB insertion loss compared to wavelength group 4.
  • the gain slope design of BA can compensate for additional insertion loss Makes the overall power balance within the DWDM bandwidth.
  • the signal passes the optical attenuation 1 module for optical attenuation compensation and power compensation of the link power compensation module.
  • the dispersion that is basically consistent for each channel introduced by the transmission fiber is compensated by the link power dispersion compensation module.
  • the transmission condition of the downlink is similar to that of the uplink, which is not described in the embodiment of the present invention.
  • the functional modules in the embodiments of the present invention may implement related functional modules through a hardware processor.
  • the device embodiments described above are only schematic, and the units described as separate components may or may not be It is not physically separated.
  • the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objective of the solution of this embodiment. Those of ordinary skill in the art can understand and implement without creative labor.
  • An embodiment of the present invention also provides a dispersion compensation method.
  • FIG. 4 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention.
  • the method provided by the embodiment of the present invention specifically includes the following steps:
  • the first multiplexer multiplexes the signals of the input upstream wavelength group and outputs a composite wave.
  • the DCF located between each two multiplexers performs dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and outputs it to the next multiplexer connected to the current DCF;
  • Each subsequent combiner combines the signals of the input upstream wavelength group and the composite wave after the DCF between the current combiner and the previous combiner is subjected to dispersion compensation. Wave to output a new synthetic wave.
  • the DCF between the multiplexers performs dispersion compensation on input signals of different wavelength groups, which can equalize the dispersion differences of different wavelength groups caused by different remote distances.
  • FIG. 5 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention.
  • the method provided by the embodiment of the present invention specifically includes the following steps:
  • Each demultiplexer demultiplexes an input signal, outputs signals corresponding to a downstream wavelength group, and sends signals of other downstream wavelength groups to a DCF located between a current demultiplexer and a next demultiplexer;
  • the DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
  • dispersion pre-compensation is performed on input signals of different wavelength groups through DCF between the demultiplexers, which can equalize dispersion differences of different wavelength groups caused by different remote distances.
  • the wavelength groups are sorted according to the distance from the farthest to the shortest, and the center wavelengths are sorted from short to long.
  • the method further includes:
  • the uplink preamplifier receives the composite wave output from the last multiplexer and performs power compensation on the received composite wave.
  • the method further includes:
  • the downstream post-amplifier pre-compensates the received signal and sends it to the first splitter.
  • the length of the DCF between each two multiplexers is (L a -L b ) / k- ⁇ D ⁇ L b ( ⁇ b - ⁇ a ) / D, where L a is the distance of the upstream wavelength group corresponding to the previous multiplexer connected to the current DCF, L b is the distance of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, ⁇ a is the distance to the current The central wavelength of the transmission signal of the upstream wavelength group corresponding to the previous multiplexer connected to the DCF, ⁇ b is the central wavelength of the transmission signal of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, and k is the DCF dispersion and The ratio between transmission fiber dispersions, D is the average dispersion of the transmission fiber in the communication band, and ⁇ D is the dispersion slope of the transmission fiber.
  • (L a -L b ) / k represents dispersion compensation
  • ⁇ D ⁇ L b ( ⁇ b - ⁇ a ) / D represents dispersion slope compensation
  • each embodiment can be implemented by means of software plus a necessary universal hardware platform, and of course, also by hardware.
  • the above-mentioned technical solution essentially or part that contributes to the existing technology can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic A disc, an optical disc, and the like include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments.

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Abstract

The embodiments of the present invention provide a dispersion compensation device and method. Said device comprises: a plurality of multiplexers arranged in sequence and a DCF located between every two multiplexers; each multiplexer receives a signal of an uplink wavelength group, a first multiplexer is used for multiplexing an input signal of the uplink wavelength group and outputting a synthesized wave; the DCF located between every two multiplexers is used to perform dispersion compensation on the synthesized wave outputted from the last multiplexer connected to the current DCF, and to output same to the next multiplexer connected to the current DCF; and each subsequent multiplexer is used to multiplex the input signal of the uplink wavelength group and the synthesized wave, which is outputted from the last multiplexer and on which dispersion compensation has been performed by means of the DCF between the current multiplexer and the last multiplexer, so as to output a new synthesized wave. The embodiments of the present invention perform, by means of the DCFs between the multiplexers, dispersion compensation on input signals of different wavelength groups, thereby being able to equalize the dispersion difference of different wavelength groups due to different remote distances.

Description

色散补偿装置和方法Dispersion compensation device and method 技术领域Technical field
本发明实施例涉及光纤通信技术领域，尤其涉及一种色散补偿装置和方法。Embodiments of the present invention relate to the field of optical fiber communication technologies, and in particular, to a dispersion compensation device and method.
背景技术Background technique
在光纤接入网中，接入点需要将不同拉远距离的业务数据汇聚到本地设备并传输到上级数据中心进行通信，例如有的光信道可能在本地设备上产生，拉远距离为零，有的光信道可能在十公里以外产生，需要通过光纤连接到本地设备，与本地业务数据合波后再传输到上级数据中心。In a fiber-optic access network, access points need to aggregate different long-distance business data to the local device and transmit it to the upper-level data center for communication. For example, some optical channels may be generated on the local device, and the remote distance is zero. Some optical channels may be generated ten kilometers away. They need to be connected to local equipment through optical fibers, multiplexed with local service data, and then transmitted to the upper-level data center.
不同光波长信号通过不同光信道各自传输信息，不同光信道拉远距离的差异造成不同光信道传输过程中色散的差异，如果色散差异较大，现有的色散补偿方法难以实现对所有信道进行精确的色散补偿。例如在光纤接入网中广泛应用的PAM4((Pulse Amplitude Modulation，脉冲幅度调制))格式的光信号调制方式仅能容忍约+/-50ps/nm的残余色散，如果不同光波长信道(波长组)的拉远距离的差异有10km，若以17ps/nm/km的普通单模光纤计算，无论在链路中如何进行色散补偿，都无法使得所有光波长信道同时满足残余色散的要求。Signals with different optical wavelengths transmit information through different optical channels. Differences in the distance of different optical channels cause differences in dispersion during the transmission of different optical channels. If the dispersion is large, the existing dispersion compensation methods are difficult to achieve accurate accuracy for all channels. Dispersion compensation. For example, the optical signal modulation method of PAM4 (Pulse Amplitude Modulation) format widely used in optical fiber access networks can only tolerate residual dispersion of about +/- 50ps / nm. If different optical wavelength channels (wavelength groups The difference in long-distance distances is 10 km. If calculated with a common single-mode fiber at 17 ps / nm / km, no matter how the dispersion compensation is performed in the link, all optical wavelength channels cannot meet the requirements of residual dispersion at the same time.
因此，如何均衡不同拉远距的光波长信道产生的色散差异，以满足所有光波长信道的色散要求，成为亟待解决的问题。Therefore, how to equalize the dispersion differences caused by different long-wavelength optical wavelength channels to meet the dispersion requirements of all optical wavelength channels has become an urgent problem.
发明内容Summary of the invention
针对现有技术问题，本发明实施例提供一种色散补偿装置和方法。Aiming at the problems in the prior art, embodiments of the present invention provide a dispersion compensation device and method.
一方面，本发明实施例提供一种色散补偿装置，所述装置包括：In one aspect, an embodiment of the present invention provides a dispersion compensation device, where the device includes:
一组次序排列的多个合波器以及位于每两个合波器之间的DCF，每个合波器接收一个上行波长组的信号，其中：A set of multiple multiplexers arranged in sequence and a DCF located between each two multiplexers. Each multiplexer receives a signal from an upstream wavelength group, where:
第一个合波器用于对输入的上行波长组的信号进行合波，输出合成波；The first multiplexer is used to multiplex the signals of the input upstream wavelength group and output a composite wave;
位于每两个合波器之间DCF用于对与当前DCF相连的前一个合波器输 出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；The DCF located between each two multiplexers is used to perform dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and output to the next multiplexer connected to the current DCF;
后续的每个合波器用于对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。Each subsequent multiplexer is used to multiplex the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation. To output a new synthetic wave.
另一方面，本发明实施例提供一种色散补偿方法，所述方法包括：In another aspect, an embodiment of the present invention provides a dispersion compensation method. The method includes:
第一个合波器对输入的上行波长组的信号进行合波，输出合成波；The first multiplexer multiplexes the signals of the input upstream wavelength group and outputs a composite wave;
位于每两个合波器之间DCF对与当前DCF相连的前一个合波器输出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；The DCF between each two multiplexers performs dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and outputs it to the next multiplexer connected to the current DCF;
后续的每个合波器对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。Each subsequent multiplexer multiplexes the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation, Output a new synthetic wave.
本发明实施例通过各合波器之间的DCF对不同波长组输入信号进行色散补偿，能够均衡不同波长组由不同拉远距离产生的色散差异。In the embodiment of the present invention, dispersion compensation is performed on input signals of different wavelength groups through DCF between the multiplexers, which can equalize dispersion differences caused by different distances of different wavelength groups.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.
图1为本发明一实施例提供的色散补偿装置的结构示意图；1 is a schematic structural diagram of a dispersion compensation device according to an embodiment of the present invention;
图2为本发明又一实施例提供的色散补偿装置的结构示意图；2 is a schematic structural diagram of a dispersion compensation device according to another embodiment of the present invention;
图3为本发明一实施例提供的包含上行色散补偿和下行色散补偿的装置的结构示意图；3 is a schematic structural diagram of an apparatus including uplink dispersion compensation and downlink dispersion compensation according to an embodiment of the present invention;
图4为本发明一实施例提供的色散补偿方法的流程示意图；4 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention;
图5为本发明又一实施例提供的色散补偿方法的流程示意图。FIG. 5 is a schematic flowchart of a dispersion compensation method according to another embodiment of the present invention.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于 本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
图1示出了本发明实施例提供的一种色散补偿装置的结构示意图。FIG. 1 is a schematic structural diagram of a dispersion compensation device according to an embodiment of the present invention.
如图1所示，本发明实施例提供的色散补偿装置包括：As shown in FIG. 1, a dispersion compensation device provided by an embodiment of the present invention includes:
一组次序排列的多个合波器以及位于每两个合波器之间的DCF，每个合波器接收一个上行波长组的信号，其中：A set of multiple multiplexers arranged in sequence and a DCF located between each two multiplexers. Each multiplexer receives a signal from an upstream wavelength group, where:
第一个合波器用于对输入的上行波长组的信号进行合波，输出合成波；The first multiplexer is used to multiplex the signals of the input upstream wavelength group and output a composite wave;
位于每两个合波器之间DCF用于对与当前DCF相连的前一个合波器输出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；The DCF located between each two multiplexers is used to perform dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and output to the next multiplexer connected to the current DCF;
后续的每个合波器用于对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。Each subsequent multiplexer is used to multiplex the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation. To output a new synthetic wave.
本发明实施例在远程接入设备的光信道合波器之间插入级联DCF(Dispersion Compensating Fiber，色散补偿光纤)，针对不同拉远距离的波长组信号进行不同程度的色散补偿，能够均衡不同波长组由不同拉远距离产生的色散差异。In the embodiment of the present invention, a cascaded DCF (Dispersion Compensating Fiber) is inserted between the optical channel combiners of the remote access device, and different degrees of dispersion compensation are performed for different wavelength groups of signals at different distances, which can balance different The dispersion of the wavelength group caused by different distances.
具体地，本发明实施例对上行光纤通信业务中的信号传输造成的色散进行补偿。Specifically, the embodiment of the present invention compensates for dispersion caused by signal transmission in an uplink optical fiber communication service.
具体的，以上行光纤通信业务为例，本发明实施例将整体波分复用带宽内的上行信道分为N组(从波长组1到波长组N)，每个波长组分别对应由长到短不同的光纤拉远距离。本发明实施例提供N个合波器，依次接收N个波长组输入的信号。每两个合波器之间插入一段DCF，用于对不同波长组输入的信号进行色散补偿。Specifically, the upstream optical fiber communication service is taken as an example. In the embodiment of the present invention, the uplink channels in the overall wavelength division multiplexing bandwidth are divided into N groups (from wavelength group 1 to wavelength group N), and each wavelength group corresponds to a long to Short different fiber lengths. An embodiment of the present invention provides N multiplexers, and sequentially receives signals input from N wavelength groups. A section of DCF is inserted between each two multiplexers, which is used to perform dispersion compensation on signals input from different wavelength groups.
在具体实施过程中，波长组1中的信号经过第一个合波器合波之后，将合成波信号输入到第一段DCF，DCF对输入的信号进行色散补偿后输入到第二个合波器，第二个合波器对波长组2输入的信号以及合波器1输入的信号再进行合波，然后将新的合成波信号输入到第二段DCF，以此类推，依次与波长组3、波长组4等信道输入的信号进行合波，每一段DCF补偿相邻两组波长组由于拉远距离的不同而产生的信号色散的差异。In the specific implementation process, after the signals in the wavelength group 1 are combined by the first multiplexer, the composite wave signal is input to the first DCF, and the DCF performs dispersion compensation on the input signal and then inputs the second multiplex. The second multiplexer multiplexes the signal input from wavelength group 2 and the signal input from multiplexer 1, and then inputs the new composite wave signal to the second DCF, and so on. 3. The signals input from channels such as wavelength group 4 are multiplexed, and each segment of DCF compensates the difference in signal dispersion caused by the difference between the two adjacent wavelength groups due to different distances.
具体地，所述上行波长组按照拉远距离由远到近依次排序，所述上行波 长组传输信号的中心波长由短到长依次排序。Specifically, the uplink wavelength group is sorted according to the distance from the farthest to the nearest, and the central wavelength of the uplink wavelength group transmission signal is sorted from the shortest to the longest.
本发明实施对波长组的拉远距离与波长组波长的关系进行分配。具体地，将最短的一组波长(中心波长为λ 1)分配给最长拉远距离的波长组1(拉远距离为L 1)，将次短的一组波长(中心波长为λ 2)分配给次长拉远距离的波长组2(拉远距离为L 2)，以此类推，上行波长组的拉远距离由远到近依次排序，所述上行波长组传输信号的中心波长由短到长依次排序。 The implementation of the present invention allocates the relationship between the distance of the wavelength group and the wavelength of the wavelength group. Specifically, the shortest set of wavelengths (the central wavelength is λ 1 ) is assigned to the longest distant distance wavelength group 1 (the distant distance is L 1 ), and the next shortest set of wavelengths (the central wavelength is λ 2 ) Wavelength group 2 assigned to the second longest long distance (the long distance is L 2 ), and so on, and the long range of the uplink wavelength group is sorted from far to near, and the center wavelength of the transmission signal of the uplink wavelength group is short Sort long to long.
具体地，所述位于每两个合波器之间DCF的长度为
Figure PCTCN2018123442-appb-000001
其中，L a为与当前DCF相连的前一个合波器对应的上行波长组的拉远距离，L b为与当前DCF相连的后一个合波器对应的上行波长组的拉远距离，λ a为与当前DCF相连的前一个合波器对应的上行波长组的传输信号的中心波长，λ b为与当前DCF相连的后一个合波器对应的上行波长组的传输信号的中心波长，k为DCF色散和传输光纤色散之间的比例，D为通信波段传输光纤平均色散，δD为传输光纤色散斜率。 Specifically, the length of the DCF between each two multiplexers is
Figure PCTCN2018123442-appb-000001
Among them, L a is the distance of the upstream wavelength group corresponding to the previous multiplexer connected to the current DCF, L b is the distance of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, λ a Is the center wavelength of the transmission signal of the uplink wavelength group corresponding to the previous multiplexer connected to the current DCF, λ b is the center wavelength of the transmission signal of the uplink wavelength group corresponding to the next multiplexer connected to the current DCF, and k is The ratio between DCF dispersion and transmission fiber dispersion, D is the average dispersion of the transmission band transmission fiber, and δD is the dispersion slope of the transmission fiber.
本发明实施根据波长组的拉远距离与波长组波长的关系，能够合理安排每段DCF的长度。例如，在上述实施例的基础上，合波器1与合波器2之间的DCF的长度为(L 1-L 2)/k-δD×L 2(λ 2-λ 1)/D，其中，L 1为上行波长组1的拉远距离，L 2为上行波长组2的拉远距离，λ 1为上行波长组1的传输信号的中心波长，λ 2为上行波长组2的传输信号的中心波长，k为DCF色散和传输光纤色散之间的比例，D为通信波段传输光纤平均色散，δD为传输光纤色散斜率，其中，(L 1-L 2)/k表示色散补偿，δD×L 2(λ 2-λ 1)/D表示色散斜率补偿。 The implementation of the present invention can reasonably arrange the length of each segment of DCF according to the relationship between the distance of the wavelength group and the wavelength of the wavelength group. For example, based on the above embodiment, the length of the DCF between the multiplexer 1 and the multiplexer 2 is (L 1 -L 2 ) / k-δD × L 2 (λ 2 -λ 1 ) / D, Among them, L 1 is the extended distance of uplink wavelength group 1, L 2 is the extended distance of uplink wavelength group 2, λ 1 is the central wavelength of the transmission signal of uplink wavelength group 1, and λ 2 is the transmission signal of uplink wavelength group 2. The central wavelength of k, k is the ratio between DCF dispersion and transmission fiber dispersion, D is the average dispersion of transmission fiber transmission fiber, δD is the dispersion slope of transmission fiber, where (L 1 -L 2 ) / k represents dispersion compensation, δD × L 2 (λ 2 -λ 1 ) / D represents dispersion slope compensation.
具体地，所述装置还包括：Specifically, the apparatus further includes:
上行预放大器，所述上行预放大器与最后一个合波器相连，用于接收最后一个合波器输出的合成波，并对接收的合成波进行功率补偿。An uplink preamplifier, which is connected to the last multiplexer and is used to receive the composite wave output by the last multiplexer and perform power compensation on the received composite wave.
由于长拉远距离、多段级联DCF以及多级光波分复用的存在，波长组1相较波长组N经历了较多的额外插损，本发明实施例在最后一个合波器连接一个光功率放大器，通过合理设置合波后光功率放大器的增益谱斜率，可补偿额外插损，实现不同波长组之间的功率均衡。Due to the long-distance long-distance, multi-stage cascaded DCF, and multi-stage optical wavelength division multiplexing, wavelength group 1 experiences more additional insertion loss than wavelength group N. In the embodiment of the present invention, one optical fiber is connected to the last multiplexer The power amplifier can compensate the additional insertion loss by rationally setting the gain spectrum slope of the optical power amplifier after multiplexing, and realize power balance between different wavelength groups.
本发明实施例还提供一种用于下行光纤通信业务的色散补偿装置。An embodiment of the present invention also provides a dispersion compensation device for downlink optical fiber communication services.
图2示出了本发明又一实施例色散补偿装置的结构示意图。FIG. 2 is a schematic structural diagram of a dispersion compensation device according to another embodiment of the present invention.
如图2所示，所述装置还包括：一组次序排列的多个分波器以及位于每两个分波器之间的DCF，每个分波器输出一个下行波长组的信号，其中：As shown in FIG. 2, the device further includes: a set of multiple demultiplexers arranged in sequence and a DCF located between every two demultiplexers, each demultiplexer outputs a signal of a downlink wavelength group, wherein:
每个分波器用于对输入的信号进行分波，输出对应下行波长组的信号，将其他下行波长组的信号发送至位于当前分波器和下一个分波器之间的DCF；Each demultiplexer is used to demultiplex the input signal, output signals corresponding to the downstream wavelength group, and send signals of other downstream wavelength groups to the DCF located between the current demultiplexer and the next demultiplexer;
位于每两个分波器之间DCF用于对与当前DCF相连的前一个分波器输出的信号进行色散预补偿，并输出至与当前DCF相连的下一个分波器。The DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
下行业务的色散补偿配置和上行业务基本对称，因此，下行业务的色散补偿装置与上行业务的色散补偿装置的功能结构类似，本发明实施例不再赘述。The dispersion compensation configuration of the downlink service and the uplink service are basically symmetrical. Therefore, the functional structure of the dispersion compensation device for the downlink service and the dispersion compensation device for the uplink service is similar, and details are not described in the embodiment of the present invention.
本发明实施例在远程接入设备的光信道分波器之间插入级联色散补偿光纤，能够实现对不同拉远距离的光波长信号进行色散的预补偿。In the embodiment of the present invention, a cascade dispersion compensation fiber is inserted between the optical channel demultiplexers of the remote access equipment, which can implement dispersion pre-compensation for optical wavelength signals at different distances.
具体地，所述下行波长组按照拉远距离由近到远依次排序，所述下行波长组传输信号的中心波长由长到短依次排序。Specifically, the downlink wavelength group is sorted according to the distance from near to far, and the central wavelengths of the transmission signals of the downlink wavelength group are sorted from long to short.
本发明实施例下行业务的色散补偿配置和上行业务基本对称，因此，对下行波长组的拉远距离与下行波长组波长的关系的分配与上行业务中色散补偿装置类似，本发明实施例不再赘述。In the embodiment of the present invention, the dispersion compensation configuration of the downlink service and the uplink service are basically symmetrical. Therefore, the allocation of the relationship between the distance of the downlink wavelength group and the wavelength of the downlink wavelength group is similar to that of the dispersion compensation device in the uplink service. To repeat.
需要说明的是，本发明实施例提供的合波器和分波器为波分复用器(Wavelength Division Multiplexing，WDM)，波分复用器可作为合波器使用，也可作为分波器使用。It should be noted that the multiplexer and demultiplexer provided by the embodiment of the present invention is a wavelength division multiplexer (WDM). The wavelength division multiplexer can be used as a multiplexer or a demultiplexer. use.
本发明实施例提供色散补偿装置结构简单，其中采用的合波器、分波器以及色散补偿光纤DCF均为无源器件，成本低、可靠性高。The embodiment of the present invention provides a simple structure of a dispersion compensation device, wherein the multiplexer, the demultiplexer, and the dispersion compensation fiber DCF are all passive components, which has low cost and high reliability.
下面结合图3对本发明实施例提供的色散补偿装置进行详细阐述。The dispersion compensation device provided by the embodiment of the present invention is described in detail below with reference to FIG. 3.
图3示出了本发明实施例提供的远程接入设备的结构示意图。FIG. 3 is a schematic structural diagram of a remote access device according to an embodiment of the present invention.
如图3所示，远程接入设备包括色散补偿装置、链路功率补偿模块和链路色散补偿模块，其中：As shown in FIG. 3, the remote access device includes a dispersion compensation device, a link power compensation module, and a link dispersion compensation module, where:
色散补偿装置包括：多个上行链路的波分复用器WDM，每两个WDM之间连接一个DCF，最后一个用于上行链路的WDM与上行预放大器BA相连，BA与光衰1相连，光衰1与链路功率补偿模块相连；The dispersion compensation device includes: multiple uplink wavelength division multiplexers WDM, one DCF is connected between each two WDMs, the last WDM for uplink is connected to uplink preamplifier BA, and BA is connected to optical attenuation 1 , The optical attenuation 1 is connected to the link power compensation module;
色散补偿装置包括：多个下行链路的波分复用器WDM，每两个WDM 之间连接一个DCF，第一个下行链路的WDM与下行后放大器PA相连，PA与光衰2相连，光衰2与链路功率补偿模块相连。The dispersion compensation device includes a plurality of downlink wavelength division multiplexers WDM, one DCF is connected between each two WDMs, the first downlink WDM is connected to a downlink post amplifier PA, and the PA is connected to optical attenuation 2. Optical attenuation 2 is connected to the link power compensation module.
链路功率补偿模块与链路色散补偿模块相连，链路功率补偿模块用于对各个上下行信道进行同一的功率补偿，链路色散补偿模块用于对各个上下行信道进行同一的色散补偿。The link power compensation module is connected to the link dispersion compensation module. The link power compensation module is used to perform the same power compensation on each uplink and downlink channel, and the link dispersion compensation module is used to perform the same dispersion compensation on each uplink and downlink channel.
以图3中四级补偿为例，波长组1到波长组4的拉远距离依次减小，传输的光信号的波长依次增加，不同波长组信道的色散差异可由原来的170ps/nm缩减到42.5ps/nm，能够满足PAM4的残余色散要求。Taking the four-level compensation in Figure 3 as an example, the distance between wavelength group 1 and wavelength group 4 decreases in sequence, the wavelength of the transmitted optical signal increases in sequence, and the dispersion difference of the channels in different wavelength groups can be reduced from the original 170ps / nm to 42.5 ps / nm, can meet the residual dispersion requirements of PAM4.
最后一个上行链路的WDM输出的合成波输入至BA，通过合理设置光功率放大器BA的增益谱斜率，可实现不同波长组之间的功率均衡。例如由于长拉远距离、多卷DCF、多级光波分复用的存在，波长组1相较波长组4经历额外的4～5dB插损，通过BA的增益斜率设计，可补偿额外插损，使得DWDM带宽内达到整体功率均衡。The composite wave output from the last uplink WDM is input to the BA. By properly setting the slope of the gain spectrum of the optical power amplifier BA, power balance between different wavelength groups can be achieved. For example, due to the existence of long-distance long-distance, multi-volume DCF, and multi-level optical wavelength division multiplexing, wavelength group 1 experiences an additional 4-5 dB insertion loss compared to wavelength group 4. The gain slope design of BA can compensate for additional insertion loss Makes the overall power balance within the DWDM bandwidth.
经过功率补偿之后信号再经过光衰1模块进行光衰补偿以及链路功率补偿模块的功率补偿，传输光纤引入的对各个信道基本一致的色散则由链路功率色散补偿模块提供补偿。After the power compensation, the signal passes the optical attenuation 1 module for optical attenuation compensation and power compensation of the link power compensation module. The dispersion that is basically consistent for each channel introduced by the transmission fiber is compensated by the link power dispersion compensation module.
下行链路的传输情况与上行链路类似，本发明实施例不再赘述。The transmission condition of the downlink is similar to that of the uplink, which is not described in the embodiment of the present invention.
本发明实施例中的功能模块可以通过硬件处理器(hardware processor)来实现相关功能模块，以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。The functional modules in the embodiments of the present invention may implement related functional modules through a hardware processor. The device embodiments described above are only schematic, and the units described as separate components may or may not be It is not physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objective of the solution of this embodiment. Those of ordinary skill in the art can understand and implement without creative labor.
本发明实施例还提供一种色散补偿方法。An embodiment of the present invention also provides a dispersion compensation method.
图4示出了本发明实施例提供的色散补偿方法的流程示意图。FIG. 4 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention.
参照图4，本发明实施例提供的方法具体包括以下步骤：Referring to FIG. 4, the method provided by the embodiment of the present invention specifically includes the following steps:
S11、第一个合波器对输入的上行波长组的信号进行合波，输出合成波；S11. The first multiplexer multiplexes the signals of the input upstream wavelength group and outputs a composite wave.
S12、位于每两个合波器之间DCF对与当前DCF相连的前一个合波器输出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；S12. The DCF located between each two multiplexers performs dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and outputs it to the next multiplexer connected to the current DCF;
S13、后续的每个合波器对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。S13. Each subsequent combiner combines the signals of the input upstream wavelength group and the composite wave after the DCF between the current combiner and the previous combiner is subjected to dispersion compensation. Wave to output a new synthetic wave.
本发明实施例提供的色散补偿方法，通过各合波器之间的DCF对不同波长组输入信号进行色散补偿，能够均衡不同波长组由不同拉远距离产生的色散差异。In the dispersion compensation method provided by the embodiment of the present invention, the DCF between the multiplexers performs dispersion compensation on input signals of different wavelength groups, which can equalize the dispersion differences of different wavelength groups caused by different remote distances.
图5示出了本发明实施例提供的色散补偿方法的流程示意图。FIG. 5 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention.
参照图5，本发明实施例提供的方法具体包括以下步骤：Referring to FIG. 5, the method provided by the embodiment of the present invention specifically includes the following steps:
S21、每个分波器对输入的信号进行分波，输出对应下行波长组的信号，将其他下行波长组的信号发送至位于当前分波器和下一个分波器之间的DCF；S21. Each demultiplexer demultiplexes an input signal, outputs signals corresponding to a downstream wavelength group, and sends signals of other downstream wavelength groups to a DCF located between a current demultiplexer and a next demultiplexer;
S22、位于每两个分波器之间DCF用于对与当前DCF相连的前一个分波器输出的信号进行色散预补偿，并输出至与当前DCF相连的下一个分波器。S22. The DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
本发明实施例提供的色散补偿方法，通过各分波器之间的DCF对不同波长组输入信号进行色散预补偿，能够均衡不同波长组由不同拉远距离产生的色散差异。In the dispersion compensation method provided by the embodiment of the present invention, dispersion pre-compensation is performed on input signals of different wavelength groups through DCF between the demultiplexers, which can equalize dispersion differences of different wavelength groups caused by different remote distances.
在上述实施例的基础上，所述波长组按照拉远距离由远到近依次对应中心波长由短到长排序。On the basis of the above embodiment, the wavelength groups are sorted according to the distance from the farthest to the shortest, and the center wavelengths are sorted from short to long.
在上述实施例的基础上，所述方法还包括：Based on the above embodiments, the method further includes:
在S13之后，上行预放大器接收最后一个合波器输出的合成波，并对接收的合成波进行功率补偿。After S13, the uplink preamplifier receives the composite wave output from the last multiplexer and performs power compensation on the received composite wave.
所述方法还包括：The method further includes:
在S21之前，下行后放大器对接收的信号进行功率预补偿，并发送至第一个分波器。Before S21, the downstream post-amplifier pre-compensates the received signal and sends it to the first splitter.
在上述实施例的基础上，所述位于每两个合波器之间DCF的长度为(L a-L b)/k-δD×L b(λ b-λ a)/D，其中，L a为与当前DCF相连的前一个合波器对应的上行波长组的拉远距离，L b为与当前DCF相连的后一个合波器对应的上行波长组的拉远距离，λ a为与当前DCF相连的前一个合波器对应的上行波长组的传输信号的中心波长，λ b为与当前DCF相连的后一个合波器对应的上行波长组的传输信号的中心波长，k为DCF色散和传输光纤色散之 间的比例，D为通信波段传输光纤平均色散，δD为传输光纤色散斜率。 Based on the above embodiment, the length of the DCF between each two multiplexers is (L a -L b ) / k-δD × L b (λ b -λ a ) / D, where L a is the distance of the upstream wavelength group corresponding to the previous multiplexer connected to the current DCF, L b is the distance of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, λ a is the distance to the current The central wavelength of the transmission signal of the upstream wavelength group corresponding to the previous multiplexer connected to the DCF, λ b is the central wavelength of the transmission signal of the upstream wavelength group corresponding to the next multiplexer connected to the current DCF, and k is the DCF dispersion and The ratio between transmission fiber dispersions, D is the average dispersion of the transmission fiber in the communication band, and δD is the dispersion slope of the transmission fiber.
具体地，(L a-L b)/k表示色散补偿，δD×L b(λ b-λ a)/D表示色散斜率补偿。 Specifically, (L a -L b ) / k represents dispersion compensation, and δD × L b (λ b -λ a ) / D represents dispersion slope compensation.
本领域的技术人员能够理解，尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征，但是不同实施例的特征的组合意味着处于本发明的范围之内并且形成不同的实施例。Those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments is meant to be within the scope of the present invention And different embodiments are formed.
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行各个实施例或者实施例的某些部分所述的方法。Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary universal hardware platform, and of course, also by hardware. Based on such an understanding, the above-mentioned technical solution essentially or part that contributes to the existing technology can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic A disc, an optical disc, and the like include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than limiting them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still Modifications to the technical solutions described in the foregoing embodiments, or equivalent replacements of some of the technical features thereof; and these modifications or replacements do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

  1. 一种色散补偿装置，其特征在于，所述装置包括：A dispersion compensation device is characterized in that the device includes:
    一组次序排列的多个合波器以及位于每两个合波器之间的DCF，每个合波器接收一个上行波长组的信号，其中：A set of multiple multiplexers arranged in sequence and a DCF located between each two multiplexers. Each multiplexer receives a signal from an upstream wavelength group, where:
    第一个合波器用于对输入的上行波长组的信号进行合波，输出合成波；The first multiplexer is used to multiplex the signals of the input upstream wavelength group and output a composite wave;
    位于每两个合波器之间DCF用于对与当前DCF相连的前一个合波器输出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；The DCF located between each two multiplexers is used to perform dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and output to the next multiplexer connected to the current DCF;
    后续的每个合波器用于对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。Each subsequent multiplexer is used to multiplex the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation. To output a new synthetic wave.
  2. 根据权利要求1所述的装置，其特征在于，所述装置还包括：The device according to claim 1, further comprising:
    一组次序排列的多个分波器以及位于每两个分波器之间的DCF，每个分波器输出一个下行波长组的信号，其中：A set of multiple demultiplexers arranged in sequence and a DCF located between every two demultiplexers, each demultiplexer outputs a signal of a downlink wavelength group, where:
    每个分波器用于对输入的信号进行分波，输出对应下行波长组的信号，将其他下行波长组的信号发送至位于当前分波器和下一个分波器之间的DCF；Each demultiplexer is used to demultiplex the input signal, output signals corresponding to the downstream wavelength group, and send signals of other downstream wavelength groups to the DCF located between the current demultiplexer and the next demultiplexer;
    位于每两个分波器之间DCF用于对与当前DCF相连的前一个分波器输出的信号进行色散预补偿，并输出至与当前DCF相连的下一个分波器。The DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
  3. 根据权利要求2所述的装置，其特征在于，The device according to claim 2, wherein:
    所述上行波长组按照拉远距离由远到近依次排序，所述上行波长组传输信号的中心波长由短到长依次排序；The uplink wavelength group is sorted according to the distance from the farthest to the nearest, and the central wavelength of the transmission signal of the uplink wavelength group is sorted from the shortest to the longest;
    所述下行波长组按照拉远距离由近到远依次排序，所述下行波长组传输信号的中心波长由长到短依次排序。The downlink wavelength group is sorted according to the distance from near to far, and the central wavelengths of the transmission signals of the downlink wavelength group are sorted from long to short.
  4. 根据权利要求1或2所述的装置，其特征在于，所述装置还包括：The device according to claim 1 or 2, wherein the device further comprises:
    上行预放大器，所述上行预放大器与最后一个合波器相连，用于接收最后一个合波器输出的合成波，并对接收的合成波进行功率补偿；An uplink preamplifier, which is connected to the last multiplexer and is configured to receive the composite wave output by the last multiplexer and perform power compensation on the received composite wave;
    下行后放大器，所述下行后放大器与第一个分波器相连，用于对接收的信号进行功率预补偿，并发送至第一个分波器。A downstream post-amplifier, which is connected to the first demultiplexer and is used to pre-compensate the received signal and send the received signal to the first demultiplexer.
  5. 根据权利要求1或2所述的装置，其特征在于，所述位于每两个合波器之间DCF的长度为(L a-L b)/k-δD×L b(λ b-λ a)/D，其中，L a为与当前DCF 相连的前一个合波器对应的上行波长组的拉远距离，L b为与当前DCF相连的后一个合波器对应的上行波长组的拉远距离，λ a为与当前DCF相连的前一个合波器对应的上行波长组的传输信号的中心波长，λ b为与当前DCF相连的后一个合波器对应的上行波长组的传输信号的中心波长，k为DCF色散和传输光纤色散之间的比例，D为通信波段传输光纤平均色散，δD为传输光纤色散斜率。 The device according to claim 1 or 2, wherein a length of the DCF between each two multiplexers is (L a -L b ) / k-δD × L b (λ b -λ a ) / D, wherein the pull-up distance L a wavelength group with the DCF before the current multiplexer connected to a corresponding, L b is connected with the current DCF a multiplexer uplink wavelength corresponding to the remote group Distance, λ a is the center wavelength of the transmission signal of the uplink wavelength group corresponding to the previous multiplexer connected to the current DCF, λ b is the center of the transmission signal of the uplink wavelength group corresponding to the next multiplexer connected to the current DCF Wavelength, k is the ratio between DCF dispersion and transmission fiber dispersion, D is the average dispersion of transmission fiber transmission fiber, and δD is the dispersion slope of transmission fiber.
  6. 一种色散补偿方法，其特征在于，所述方法包括：A dispersion compensation method, characterized in that the method includes:
    第一个合波器对输入的上行波长组的信号进行合波，输出合成波；The first multiplexer multiplexes the signals of the input upstream wavelength group and outputs a composite wave;
    位于每两个合波器之间DCF对与当前DCF相连的前一个合波器输出的合成波进行色散补偿，并输出至与当前DCF相连的后一个合波器；The DCF between each two multiplexers performs dispersion compensation on the composite wave output from the previous multiplexer connected to the current DCF, and outputs it to the next multiplexer connected to the current DCF;
    后续的每个合波器对输入的上行波长组的信号以及前一个合波器输出的并经过当前合波器与前一个合波器之间的DCF进行色散补偿后的合成波进行合波，输出新的合成波。Each subsequent multiplexer multiplexes the input uplink wave group signal and the composite wave after the DCF between the current multiplexer and the previous multiplexer is subjected to dispersion compensation, Output a new synthetic wave.
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：The method according to claim 6, further comprising:
    每个分波器对输入的信号进行分波，输出对应下行波长组的信号，将其他下行波长组的信号发送至相连的DCF；Each demultiplexer demultiplexes the input signal, outputs signals corresponding to the downstream wavelength group, and sends signals of other downstream wavelength groups to the connected DCF;
    位于每两个分波器之间DCF用于对与当前DCF相连的前一个分波器输出的信号进行色散预补偿，并输出至与当前DCF相连的下一个分波器。The DCF located between each two demultiplexers is used to perform dispersion pre-compensation on the signal output by the previous demultiplexer connected to the current DCF, and output to the next demultiplexer connected to the current DCF.
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