CN101697499B - The device and method of dispersion compensation - Google Patents

The device and method of dispersion compensation Download PDF

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CN101697499B
CN101697499B CN200910211377.0A CN200910211377A CN101697499B CN 101697499 B CN101697499 B CN 101697499B CN 200910211377 A CN200910211377 A CN 200910211377A CN 101697499 B CN101697499 B CN 101697499B
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dispersion compensation
dispersion
signal
different
channel
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CN101697499A (en
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张琦
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ZTE Corp
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ZTE Corp
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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
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/25—Distortion or dispersion compensation
    • H04B2210/258—Distortion or dispersion compensation treating each wavelength or wavelength band separately

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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

The invention discloses a kind of device and method of dispersion compensation, the method comprises: channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively; Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal.Can meet by the present invention the different requirements that when different rates or different modulating format signal mix biography, each channel configures dispersion, and then improve mixed transmission performance of delivering a letter.

Description

The device and method of dispersion compensation
Technical field
The present invention relates to the communications field, in particular to a kind of device and method of dispersion compensation.
Background technology
Along with the upgrading of fiber optic transmission system transmission rate, the signal of different rates and different debugging form mixes the application passed in systems in which and gets more and more, wherein an inevitable problem is exactly that different rates and different modulating format signal consider that the problem such as non-linear may need to carry out different dispersion managements, namely different dispersion compensation configurations is carried out at one across section place, and traditional dispersion compensation device adopts same dispersion compensation configuration to all channels, mixed different dispersion compensation configuration needs of delivering a letter cannot be met like this, the severe exacerbation of some channel performance may be caused in severe cases.
Mixed different dispersion compensation configuration needs of delivering a letter cannot be met for correlation technique, under different rates or different modulating format signal mix the condition that conveys feelings, often cause the problem of the severe exacerbation of some channel performance, not yet propose effective solution at present.
Summary of the invention
For meeting mixed different dispersion compensation configuration needs of delivering a letter, under different rates or different modulating format signal mix the condition that conveys feelings, often cause the problem of the severe exacerbation of some channel performance and propose the present invention, for this reason, main purpose of the present invention is the device and method providing a kind of dispersion compensation, to solve the problem.
To achieve these goals, according to an aspect of the present invention, a kind of device of dispersion compensation is provided.
Device according to dispersion compensation of the present invention comprises: channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively; Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal.
Preferably, channel separation unit comprises: optical demultiplexer, for the mixed number of delivering a letter is demultiplexed into each channel; Optical multiplexer, for closing Bo Wei mono-tunnel by the channel meeting predetermined condition in each channel.
Preferably, channel separation unit also comprises: array of photoswitch, between optical demultiplexer and optical multiplexer, for controlling each channel.
Preferably, dispersion compensation unit comprises multiple dispersion compensation module, and wherein, multiple dispersion compensation module is made up of dispersion compensating fiber, and each dispersion compensation module carries out dispersion compensation to each signal of input respectively.
Preferably, device also comprises: power equalization unit, for carrying out power equalization process to the signal after dispersion compensation.
Preferably, power equalization unit comprises: adjustable attenuator.
Preferably, conjunction involves power equalization unit and comprises: wave multiplexer, for the signal after dispersion compensation is carried out the process of conjunction ripple.
Preferably, the multiple signals having different dispersion configuration requirement comprise: the signal with different rates or different modulating mode.
To achieve these goals, according to a further aspect in the invention, a kind of method of dispersion compensation is provided.
Method according to dispersion compensation of the present invention comprises: the mixed number of delivering a letter is separated into the signal with different dispersion configuration requirements; Adopt corresponding dispersion compensation to configure respectively to the signal with different dispersion configuration requirement and carry out dispersion compensation.
Preferably, configure adopting corresponding dispersion compensation respectively to the signal with different dispersion configuration requirement after carrying out dispersion compensation, the method also comprises: the signal with different dispersion configuration requirement after dispersion compensation is carried out conjunction ripple and/or power equalization process.
Device according to dispersion compensation of the present invention comprises: channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively; Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal.Pass through the present invention, solve correlation technique and cannot meet mixed different dispersion compensation configuration needs of delivering a letter, the problem of the severe exacerbation of some channel performance is often caused under different rates or different modulating format signal mix the condition that conveys feelings, and then the different requirements that when different rates or different modulating format signal mix biography, each channel configures dispersion can be met, and then improve mixed transmission performance of delivering a letter.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the device of preferred dispersion compensation according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the device of dispersion compensation according to the embodiment of the present invention one;
Fig. 3 is the schematic diagram of the device of dispersion compensation according to the embodiment of the present invention two;
Fig. 4 is the flow chart of the method for dispersion compensation according to the embodiment of the present invention.
Embodiment
Functional overview
Consider that correlation technique cannot meet mixed different dispersion compensation configuration needs of delivering a letter, under different rates or different modulating format signal mix the condition that conveys feelings, often cause the severe exacerbation of some channel performance, embodiments provide a kind of device and method of dispersion compensation.This device comprises: channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively; Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal.
In order to solve different rates or different modulating format signal mix the condition that conveys feelings under the mixed problem passing channel dispersion configuration contradiction, ensure mixed transmission performance of delivering a letter, the present invention proposes a kind of dispersion compensation device for this applied environment especially, this dispersion compensation device can meet the different requirements to dispersion configuration when different rates or different modulating format signal mix biography, and then improves mixed transmission performance of delivering a letter.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
According to embodiments of the invention, provide a kind of device of dispersion compensation.
Fig. 1 is the schematic diagram of the device of preferred dispersion compensation according to the embodiment of the present invention.
As shown in Figure 1, this device comprises: channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively; Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
The problem to be solved in the present invention be in order to avoid different rates or different modulating format signal mix the condition that conveys feelings under because of the uncomfortable impact caused systematicness of dispersion configuration, ensure the transmission performance of the mixed number of delivering a letter, for this problem, the present invention proposes a kind of device that can carry out dispersion compensation to the mixed number of delivering a letter of different dispersion configuration requirement especially, and this device can meet the different requirements that when different rates or different modulating format signal mix biography, each channel configures dispersion.
In order to achieve the above object, the invention provides a kind of device that can carry out dispersion compensation to the mixed number of delivering a letter of different dispersion configuration requirement, preferably, this device comprises:
Channel separation unit: for the mixed number of delivering a letter of different dispersion configuration requirement is separated, and the part of separating is not delivered to dispersion compensation unit and adopted different dispersion compensation allocation plans to carry out dispersion compensation.The input a of channel separation unit is the mixed number of delivering a letter of different dispersion configuration requirement, output b1 is the subchannel that the signal group needing equally to adopt the first dispersion compensation to configure is formed, output b2 is the subchannel needing equally to adopt the signal group of the second dispersion compensation configuration to form, ..., output bn is the subchannel needing the signal group of employing n-th kind of dispersion compensation configuration to form equally.
Dispersion compensation unit: carry out dispersion compensation for adopting different dispersion compensation configurations respectively to the signal of different rates and modulation system.Its input signal b1 ~ bn is the subchannel needing to adopt n kind dispersion compensation allocation plan respectively, becomes c1 ~ cn, be input to conjunction and involve power equalization unit after n sub-channels is adopted suitable dispersion compensation respectively.
Preferably, this device can also comprise conjunction and involve power equalization unit: for the subchannel c1 ~ cn through different dispersion compensation schemes being carried out the power equalization closing ripple and interchannel; Because c1 ~ cn have passed through different dispersion compensation schemes, the insertion loss difference of its dispersion compensation schemes can cause serious channel power unbalanced, this will cause amplifier to enter saturated, therefore power equalization must be carried out while conjunction ripple, consistent to ensure the signal power of each wavelength entering amplifier.Feeding amplifying unit is carried out signal amplification by the signal f after closing ripple and power equalization.
Preferably, this device can also comprise amplifying unit: amplifying signal, compensates the decay in transmission.
Below in an example, will be described under the mixed condition that conveys feelings of different rates signal, particularly, will be described for 100Gb/s signal and mixed biography of 10Gb/s signal.
In the present invention, need to carry out except the situation of different dispersion compensation configuration except the above-mentioned different rates mentioned and different modulating form mix to pass, also may there is the situation that different route causes needing to carry out different dispersion compensations, even may even because route handoff causes needs to be transformed to another kind from a kind of compensation way, but different rates and different modulating form are modal two kinds of situations, and there is no particularly preferred solution, and the situation of different route can adopt additive method to avoid, the present invention includes but be not limited to above different situation.
In 100Gb/s WDM transmission system, available modulation format mainly contains: (RZ)-DQPSK, the O-OFDM (Shuangzi carrier wave) of difference detecting, DP-(D) QPSK of coherent detection.Wherein DP-(D) the QPSK pattern of coherent detection is all better than another two kinds of patterns in OSNR tolerance limit, dispersion tolerance, PMD tolerance limit, filter cascade characteristic etc. back-to-back, becoming the first-selection of 100Gb/sWDM main line long range propagation pattern, is also the research pattern that current OIF selectes.
Although DP-(D) QPSK modulation format has obvious advantage in OSNR tolerance limit, dispersion tolerance, PMD tolerance limit, filter cascade characteristic etc. back-to-back, its systematic function is larger by the impact of nonlinear effect.Because the non linear coefficient of dispersion compensating fiber is larger, larger nonlinear effect can be brought, and DP-(D) QPSK can reach several ten thousand ps/nm in the Digital Signal Processing of receiving terminal to the compensation ability of dispersion, therefore for 100Gb/sDP-(D) QPSK signal, best dispersion management is configured to not carry out dispersion compensation on transmission link, and greatly reduces the impact of nonlinear effect at transmitting terminal and receiving terminal to the scheme that centralized compensation is carried out in dispersion.
But the 10Gb/s NRZ signal mixing biography with 100Gb/s DP-(D) QPSK signal does not adopt Digital Signal Processing at receiving terminal, limited to the tolerance limit of dispersion, therefore need in transmission link, adopt dispersion compensation module periodically to compensate dispersion across section each, for this demand, provide two embodiments below.
Embodiment one
100Gb/s DP-(D) QPSK signal and the mixed biography of 10Gb/s NRZ signal, transmission channel is fixed.For convenience of description, be L by 100Gb/s DP-(D) QPSK channel number consecutively 1~ L k, 10Gb/s NRZ channel number consecutively is L k+1~ L n, wherein L 1to L nsequence be only channel number, with channel wavelength have nothing to do.
Fig. 2 is the schematic diagram of the device of dispersion compensation according to the embodiment of the present invention one.
As shown in Figure 2, this device can comprise with lower part:
Channel separation unit: comprise optical demultiplexer (ODU), optical multiplexer 1 (OMU1) and optical multiplexer 2 (OMU2), be demultiplexed into each channel after mixed signal input ODU, incite somebody to action wherein 100Gb/s DP-(D) QPSK signalling channel L 1~ L kbe conveyed into OMU1 and close Bo Wei mono-tunnel, by 10Gb/s NRZ signalling channel L k+1~ L nsend into OMU2 and close Bo Wei mono-tunnel.Because transmission channel is more fixing, optical demultiplexer and optical multiplexer in the present embodiment, is adopted to realize channel separation, for the situation that channel signal speed and modulation format often change, can reference example two.
Dispersion compensation unit: comprise dispersion compensation module.Dispersion compensation module is made up of dispersion compensating fiber, for the dispersion compensation that OMU2 closes the 10Gb/s NRZ signalling channel group that ripple exports, configures according to the length of link across section.100Gb/sDP-(D) the QPSK signalling channel group that OMU1 exports then does not carry out dispersion compensation.Dispersion compensation unit also can adopt other modes to realize dispersion compensation, as Chirp Bragg grating (FBG) etc.
In the present invention, the method can carrying out dispersion compensation can such as dispersion compensating fiber, and fiber grating, photonic crystal fiber etc., the present invention includes but be not limited to above embodiment.
Preferably, this device can also comprise conjunction and involve power equalization unit: comprise adjustable attenuator and wave multiplexer.Because the insertion loss of dispersion compensating fiber is large, channel and the channel light power difference not through dispersion compensation of having carried out dispersion compensation are also larger, therefore use on 100Gb/s DP-(D) QPSK signalling channel one tunnel adjustable attenuator to be used for configuring each interchannel power equalization, and carry out conjunction ripple.
Preferably, this device can also comprise amplifying unit: close the signal feeding EDFA after ripple and carry out light amplification with the power attenuation in compensating signal transmission.
Embodiment two
100Gb/s DP-(D) QPSK signal and 10Gb/s NRZ signal are mixed to be passed, each channel signal transmission speed and modulation format indefinite, often can change.
Fig. 3 is the schematic diagram of the device of dispersion compensation according to the embodiment of the present invention two.
As shown in Figure 3, the device of this dispersion compensation comprises with lower part: channel separation unit, dispersion compensation unit, conjunction involve power equalization unit and amplifying unit.
Below will specifically describe various piece:
Channel separation unit: comprise optical demultiplexer (ODU), array of photoswitch, optical multiplexer 1 (OMU1) and optical multiplexer 2 (OMU2).Each channel lambda is demultiplexed into after mixed signal input ODU 1~ λ n.Due to each channel signal transmission speed and modulation format indefinite, often can change, thus the dispersion compensation allocation plan of each channel can be caused to change, therefore in channel separation unit, adopt array of photoswitch to manage passage flexibly.N channel lambda after ODU demultiplexing 1~ λ nsend into array of photoswitch, according to the dispersion configuration mode that its transmission rate and modulation format require, flexible control array of photoswitch, all 100Gb/sDP-(D) QPSK signal is distributed and is input to OMU1, all 10Gb/s NRZ signals are distributed and is input to OMU2, the signal closing ripple through OMU1 is A1, the signal closing ripple through OMU2 is A2, then A1 is all 100Gb/s DP-(D) QPSK signal, the dispersion required is configured to not carry out dispersion compensation in link, dispersion compensation is carried out again at receiving terminal, A2 is all 10Gb/s NRZ signal, the dispersion required is configured to carry out dispersion compensation according to the length across section.Its A1, A2 are sent into dispersion compensation unit respectively.
Dispersion compensation unit: comprise dispersion compensation module.Dispersion compensation module is made up of dispersion compensating fiber, for the dispersion compensation that OMU2 closes the 10Gb/s NRZ signalling channel group that ripple exports, configures according to the length of link across section.100Gb/sDP-(D) the QPSK signalling channel group that OMU1 exports then does not carry out dispersion compensation.Dispersion compensation unit also can adopt other modes to realize dispersion compensation.
Conjunction involves power equalization unit: comprise adjustable attenuator and wave multiplexer.Because the insertion loss of dispersion compensating fiber is large, channel and the channel light power difference not through dispersion compensation of having carried out dispersion compensation are also larger, therefore use on 100Gb/s DP-(D) QPSK signalling channel one tunnel adjustable attenuator to be used for configuring each interchannel power equalization, and carry out conjunction ripple.
Amplifying unit: close the signal feeding EDFA after ripple and carry out light amplification with the power attenuation in compensating signal transmission.
According to embodiments of the invention, provide a kind of method of dispersion compensation.
Fig. 4 is the flow chart of the method for dispersion compensation according to the embodiment of the present invention.
As shown in Figure 4, the method comprises following step S402 to step S404:
Step S402, is separated into the signal with different dispersion configuration requirements by the mixed number of delivering a letter;
Step S404, adopts corresponding dispersion compensation to configure respectively to the signal with different dispersion configuration requirement and carries out dispersion compensation.
Preferably, configure adopting corresponding dispersion compensation respectively to the signal with different dispersion configuration requirement after carrying out dispersion compensation, the method also comprises: the signal with different dispersion configuration requirement after dispersion compensation is carried out conjunction ripple and/or power equalization process.
As can be seen from the above description, the present invention can meet the different requirements that when different rates or different modulating format signal mix biography, each channel configures dispersion, and then improves mixed transmission performance of delivering a letter.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a device for dispersion compensation, is characterized in that, comprising:
Channel separation unit, for the mixed number of delivering a letter is separated into there is different dispersion configuration requirement multiple signals to be sent to dispersion compensation unit respectively;
Dispersion compensation unit, the dispersion configuration requirement for each signal according to input adopts the configuration of corresponding dispersion compensation to carry out dispersion compensation to signal;
Wherein, described channel separation unit comprises:
Optical demultiplexer, for being demultiplexed into each channel by the described mixed number of delivering a letter;
Optical multiplexer, for closing Bo Wei mono-tunnel by the channel in each channel described with identical dispersion configuration requirement.
2. device according to claim 1, is characterized in that, described channel separation unit also comprises:
Array of photoswitch, between described optical demultiplexer and described optical multiplexer, for controlling each channel described.
3. device according to claim 1, it is characterized in that, described dispersion compensation unit comprises multiple dispersion compensation module, wherein, described multiple dispersion compensation module is made up of dispersion compensating fiber, and each dispersion compensation module carries out dispersion compensation to each signal described in input respectively.
4. device according to any one of claim 1 to 3, is characterized in that, described device also comprises:
Power equalization unit, for carrying out power equalization process to the described signal after dispersion compensation.
5. device according to claim 4, is characterized in that, described power equalization unit comprises:
Adjustable attenuator.
6. the device according to any one of claims 1 to 3, it is characterized in that, described device also comprises: close and involve power equalization unit, wherein, described conjunction involves power equalization unit and comprises: wave multiplexer, for the described signal after dispersion compensation is carried out the process of conjunction ripple.
7. the device according to any one of claims 1 to 3, is characterized in that, described in there is different dispersion configuration requirement multiple signals comprise:
There is the signal of different rates or different modulating mode.
8. a method for dispersion compensation, is characterized in that, comprising:
The mixed number of delivering a letter is separated into the signal with different dispersion configuration requirements;
Adopt corresponding dispersion compensation to configure respectively to the described signal with different dispersion configuration requirement and carry out dispersion compensation;
Wherein, the mixed number of delivering a letter is separated into the signal with different dispersion configuration requirement to comprise:
The described mixed number of delivering a letter is demultiplexed into each channel;
The channel in each channel described with identical dispersion configuration requirement is closed Bo Wei mono-tunnel.
9. method according to claim 8, is characterized in that, configure adopting corresponding dispersion compensation respectively to the described signal with different dispersion configuration requirement after carrying out dispersion compensation, described method also comprises:
The signal described in after dispersion compensation with different dispersion configuration requirement is carried out conjunction ripple and/or power equalization process.
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CN108512601B (en) * 2017-02-28 2020-06-02 华为技术有限公司 Method and device for multi-homing access network
CN109067463B (en) * 2018-08-01 2021-04-09 武汉光迅科技股份有限公司 Remote optical fiber dispersion compensation device and method, remote access device, electronic device, and non-transitory computer-readable storage medium
CN109274427A (en) * 2018-08-01 2019-01-25 武汉光迅科技股份有限公司 Dispersion compensation device and method
CN112684541B (en) * 2021-01-19 2021-11-19 浙江大学 Cascade type adjustable silicon-based Bragg grating dispersion compensator
CN113949455B (en) * 2021-09-16 2023-02-14 武汉光迅科技股份有限公司 Optical communication device and optical communication system

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CN1361950A (en) * 1999-07-19 2002-07-31 住友电气工业株式会社 Dispersion compensation system
CN1486011A (en) * 2002-09-28 2004-03-31 华为技术有限公司 Apparatus and method for in-line dispersion compensating of mixing rate system

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Publication number Priority date Publication date Assignee Title
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CN1486011A (en) * 2002-09-28 2004-03-31 华为技术有限公司 Apparatus and method for in-line dispersion compensating of mixing rate system

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