WO2021254279A1 - 一种wdm系统的色散调整方法及装置 - Google Patents

一种wdm系统的色散调整方法及装置 Download PDF

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WO2021254279A1
WO2021254279A1 PCT/CN2021/099814 CN2021099814W WO2021254279A1 WO 2021254279 A1 WO2021254279 A1 WO 2021254279A1 CN 2021099814 W CN2021099814 W CN 2021099814W WO 2021254279 A1 WO2021254279 A1 WO 2021254279A1
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dispersion compensation
interruption time
service interruption
value
wdm system
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PCT/CN2021/099814
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English (en)
French (fr)
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高立东
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中兴通讯股份有限公司
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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
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor

Definitions

  • This application relates to the DWDM (Dense Wavelength Division Multiplexing) optical communication field, high-level modulation technology, and in particular to the dispersion adjustment method and device of the WDM (Wavelength Division Multiplexing) system.
  • DWDM Dense Wavelength Division Multiplexing
  • WDM Widelength Division Multiplexing
  • the first scheme is shown in Figure 1 for the user to automatically configure a fixed compensation value for dispersion.
  • the second scheme is that after the user configures the dispersion search range shown in Figure 2, the DSP realizes an automatic search.
  • the search method is a dichotomy.
  • the first solution is fast and consumes less time, but it is difficult to know the true dispersion value.
  • the second scheme can obtain the dispersion compensation value, but it takes extra time to search.
  • this application proposes a dispersion adjustment method and device for a WDM system, which is dedicated to optimizing the problem of excessive service recovery time caused by the protection switching of the bearer network.
  • This application at least to a certain extent solves the technical problem that the dispersion search algorithm in related technologies only considers service recovery and does not consider the characteristics of actual application scenarios, that is, the transmission distance of the OTN optical network is basically fixed and the technical problem that the search must be re-searched after each service recovery, and further Ensure the communication quality and application implementation of the optical communication network.
  • a dispersion adjustment method based on a WDM system including:
  • the dispersion compensation value obtained by the initialization parameter is used to perform dispersion compensation for the WDM system
  • the required dispersion compensation value is searched within the default dispersion compensation search range obtained by the initialization parameters, and the searched required dispersion compensation value is used to perform dispersion compensation for the WDM system.
  • this application provides a dispersion adjustment device based on a WDM system, including:
  • the service interruption time determination module is used to monitor the service interruption time to determine whether the service interruption time is the first service interruption time or lasts to the second service interruption time;
  • the first dispersion compensation module is configured to perform dispersion compensation on the WDM system by using the dispersion compensation value obtained by the initialization parameter when the service interruption time is determined to be the first service interruption time;
  • the second dispersion compensation module is used to search for the required dispersion compensation value within the default dispersion compensation search range determined by the initialization parameters when it is determined that the service interruption time is the second service interruption time, and use the searched required dispersion compensation Value for dispersion compensation for WDM system.
  • Fig. 1 is a schematic diagram of the principle of the existing fixed dispersion compensation method
  • FIG. 2 is a schematic diagram of the principle of searching for dispersion compensation value by the existing dichotomy
  • Fig. 3 is a schematic diagram of the principle of the dispersion search compensation method of the present application.
  • Figure 4 is a schematic diagram of realizing engineering application protection
  • FIG. 5 is a schematic diagram of the dispersion adjustment method based on the WDM system of the present application.
  • Figure 6 is a flow chart of the core algorithm of this application.
  • Fig. 7 is a schematic diagram of the dispersion adjusting device based on the WDM system of the present application.
  • Figure 3 shows the principle of the dispersion search compensation method of this application, which takes into account the characteristics of the actual application scenario, that is, the OTN optical network transmission distance is basically fixed and the search is not necessarily re-searched after each service recovery, and the application is stable in the actual project site.
  • the memory function is added, that is, to save the stable dispersion compensation value color, so as to automatically adjust the dispersion search strategy and automatically adjust the search range, thereby reducing the system recovery time and improving the stability of the entire system and customer satisfaction.
  • Figure 5 shows a dispersion adjustment method based on the WDM system of the present application.
  • the method can be applied to 1+1 optical layer protection or 1:n optical layer protection.
  • this application uses 1+1 optical layer protection.
  • the layer protection is described as an example.
  • a dispersion adjustment method based on the WDM system of the present application includes:
  • the dispersion compensation value obtained by the initialization parameter is used to perform dispersion compensation for the WDM system
  • the required dispersion compensation value is searched within the default dispersion compensation search range obtained by the initialization parameters, and the searched required dispersion compensation value is used to perform dispersion compensation for the WDM system.
  • the dispersion compensation value obtained by the initialization parameters of this application is the dispersion compensation value required by the actual optical network, and can be obtained by using related technologies. This application saves the dispersion compensation value required by the actual optical network, and loads the dispersion compensation value through the initialization parameters.
  • whether the service interruption time enters the second service interruption time depends on whether the service resumes after the dispersion compensation is performed on the WDM system during the first service interruption time. If the service resumes, the service interruption time is cancelled. This shows that whether this application performs dispersion compensation for the WDM system during the second service interruption time depends on the result of the dispersion compensation for the WDM system during the first service interruption time; if the result of the dispersion compensation for the WDM system is that the service is not restored, Then, during the second service interruption time, search for the required dispersion compensation value, and perform dispersion compensation for the WDM system; otherwise, stop the dispersion compensation value operation.
  • this application can use the dispersion compensation value obtained by the initialization parameter to perform dispersion compensation on the WDM system and restore the service.
  • the path related to the 1+1 optical layer protection changes (the probability of occurrence is small)
  • the service interruption time will enter the second service interruption time.
  • this application needs to search for the dispersion compensation value and verify the dispersion compensation value searched, until the required dispersion compensation value searched is used to compensate the WDM system. After the dispersion compensation , Use the searched required dispersion compensation value to update the dispersion compensation value obtained by the initialization parameter, so that the updated dispersion compensation value is used to perform dispersion compensation on the WDM system during the next first service interruption time. That is, this application uses the saved updated dispersion compensation value as the default value of the next initialization parameter, so that the updated dispersion compensation value is used to perform dispersion compensation for the WDM system during the next first service interruption time.
  • the current dispersion compensation value obtained by the initialization parameters of this application includes at least: the optimal value of the dispersion compensation and the sub-optimal value of the dispersion compensation.
  • This application uses the current dispersion compensation value obtained by the initialization parameters to perform dispersion compensation for the WDM system, including:
  • the optimal dispersion compensation value and the dispersion compensation suboptimal value obtained by the initialization parameters will continue to be used as the current dispersion compensation optimal value and dispersion compensation suboptimal value.
  • the dispersion compensation suboptimal value and the dispersion compensation optimal value obtained by the initialization parameters are used as the current dispersion compensation optimal value and the current dispersion compensation suboptimal value. Merit.
  • the first service interruption time or time period and the second service interruption time or time period of this application can be determined according to actual needs.
  • the first service interruption time is the time or time period from 0ms to 30ms after the service interruption
  • the second service interruption time is a time or time period when the service interruption time is greater than 30 ms.
  • the required dispersion compensation value is obtained by a dichotomy including coarse dispersion adjustment and fine dispersion adjustment.
  • FIG. 6 shows the core processing algorithm processing flow of the dispersion adjustment method of this application, as follows:
  • step S10 initialize the system parameters, including the default dispersion compensation search range [min_val, max_val], the dispersion compensation optimal value A_val, and the dispersion compensation suboptimal value B_val. Since this application only considers 1+1 optical layer protection scenarios, Only two default dispersion compensation values are involved. In the actual application process, in a 1:n scene, the number of preferred values for dispersion compensation can be expanded, but no more than four.
  • step S20 it is judged whether the service interruption time is less than 30ms, if it is less than 30ms, the process goes to step S30, otherwise, the process goes to step S60.
  • step S30 use the dispersion compensation value [A_val, B_val] obtained when initializing the system parameters to give priority to try, and then the flow proceeds to step S40.
  • step S40 it is judged whether the service can be restored. If it can be restored and the final required dispersion compensation value is the same as the last time dispersion value, then in step S50, the dispersion compensation value A_val and the dispersion compensation value B_val remain unchanged; S50.
  • Use the final required dispersion compensation value as the current dispersion compensation value. For example, if the final required dispersion compensation value is B_val, use B_val as the dispersion compensation optimal value and A_val as the dispersion compensation suboptimal value, and the process ends.
  • step S60 use the default search range when initializing the parameters, that is, the search range [min_val, max_val] configured by the user to search for the dispersion compensation value.
  • This procedure mainly prevents permanent changes to the two communication links.
  • the values of A_val and B_val need to be updated. That is, the current optimal value of the dispersion value is recorded as the new A_val, and the last optimal value is recorded as the B_val obtained when the system parameters are initialized; then the flow proceeds to step S70 to end.
  • Fig. 7 shows the principle of the dispersion adjusting device based on the WDM system of the present application.
  • a dispersion adjusting device based on the WDM system of the present application includes:
  • the service interruption time determination module is used to monitor the service interruption time to determine whether the service interruption time is the first service interruption time or from the first service interruption time to the second service interruption time.
  • the service interruption time determination module may be in A timer started after a service interruption determines whether the service interruption enters the first service interruption time or enters the second service interruption time through timing;
  • the first dispersion compensation module is used to perform dispersion compensation on the WDM system by using the dispersion compensation value obtained by the initialization parameter when it is determined that the service interruption time is the first service interruption time; the first dispersion compensation module of this application is in the first service Interrupt time to read the dispersion compensation value obtained from the initialization parameters, and then use the read dispersion compensation value to perform dispersion compensation on the WDM system;
  • the second dispersion compensation module is used to search for the required dispersion compensation value within the default dispersion compensation search range determined by the initialization parameters when it is determined that the service interruption time is the second service interruption time, and use the searched required dispersion compensation Dispersion compensation for the WDM system; the second dispersion compensation module of the present application reads the dispersion compensation search range obtained by the initialization parameter during the second service interruption time, and then searches for the required dispersion compensation value in the dispersion compensation search range, and then The WDM system performs dispersion compensation.
  • the WDM system-based dispersion adjustment device of the present application may further include a dispersion compensation value update module, which is used to update the initialization with the searched required dispersion compensation value after performing dispersion compensation on the WDM system by using the searched required dispersion compensation value The dispersion compensation value obtained by the parameter, so that the updated dispersion compensation value is used to perform dispersion compensation for the WDM system during the next first service interruption time.
  • a dispersion compensation value update module which is used to update the initialization with the searched required dispersion compensation value after performing dispersion compensation on the WDM system by using the searched required dispersion compensation value The dispersion compensation value obtained by the parameter, so that the updated dispersion compensation value is used to perform dispersion compensation for the WDM system during the next first service interruption time.
  • the dispersion adjustment device based on the WDM system of the present application may further include an initialization module for obtaining the dispersion compensation value including at least the dispersion compensation optimal value and the dispersion compensation suboptimal value through the initialization parameters.
  • the initialization module extracts the updated dispersion compensation value from the dispersion compensation value update module each time the parameters are initialized, so as to obtain the dispersion compensation value when the parameters are initialized.
  • the following table shows the comparison of the beneficial effects of the dispersion search method of the present application and the fixed-value dispersion search method and dichotomy of related technologies.
  • This application can be applied to over 100G DWDM communication networks that support QPSK/8QAM/16QAM/32QAM/64QAM/128QAM and can support electrical-layer dispersion compensation.
  • the application scenarios include: IDC networks of point-to-point single-span networking in the field of government and enterprise networks, normal Traditional telecommunications networks in application scenarios, etc.
  • this application can be matched with actual applications, that is, record the dispersion compensation value required by the actual actual optical network, reduce the number of searches for the dispersion compensation value, thereby greatly saving protection switching time, improving product competitiveness, and business stability . That is, this application solves the problem of flexibility of fixed dispersion compensation, and also solves the problem of time-consuming binary search. Optimize system business recovery time by recording the characteristics of the previous system.
  • this application reduces the number of searches for the dispersion compensation value by recording the dispersion compensation value required by the current actual optical network, thereby greatly saving protection switching time, improving product competitiveness, and business stability.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种基于WDM系统的色散调整方法和装置。所述方法包括：通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时间进入到第二业务中断时间；当确定业务中断时间是第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；当确定业务中断时间是第二业务中断时间时，在初始化参数所得到默认色散补偿搜索范围内，搜索所需色散值补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿。

Description

一种WDM系统的色散调整方法及装置
相关申请的交叉引用
本申请基于申请号为202010542189.2、申请日为2020年6月15日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本申请涉及DWDM(Dense Wavelength Division Multiplexing)光通信领域、高阶调制技术，尤其涉及WDM(Wavelength Division Multiplexing)系统的色散调整方法及装置。
背景技术
随着社会的发展，技术的进步，人们对通信系统带宽的需求不断增加。伴随着5G的应用、互联网的繁荣发展，互联网公司对数据通信网络的带宽以及网络的稳定性，要求越来越高。在这种背景下，线路侧单波200G、400G、600G的应用场景不断增加。DSP(Digital Signal Processing)芯片的色散补偿功能也被支持。但由于传输距离的差异，不同的传输距离对应的色散补偿值也不同。色散即不同频率光波由于传播速度的差异，在长距传输后产生的群速差。
相关技术通常有两种解决方案。第一种方案为图1所示的用户自动配置色散固定补偿值。第二种方案为图2所示的用户配置色散搜索范围后，DSP实现自动搜索，该搜所方法为二分法。
第一种方案速度快，时间消耗少，但很难知道真正的色散值。第二种方案可以获得色散补偿值，但需要花费多余时间进行搜索。
二分法由于每次确认色散补偿值后，需要确认色散补偿值是否正确，需要经过短暂时间的业务确认时间。所以，每次尝试都是会引次业务锁定时间的变化。经验证尝试1次所约为1-5ms之间。
发明内容
本申请结合实际应用场景，提出一种WDM系统的色散调整方法及装置，致力于优化承载网保护倒换时引起的业务恢复时间过长的问题。本申请至少在一定程度上解决了相关技术中色散搜索算法仅考虑业务恢复、未考虑实际应用场景的特点即OTN光网络传输距离基本固定以及每次业务恢复后必须重新搜索的技术问题，进而进一步保证了光通信网络的通信质量以及应用实施。
根据本申请第一方面，提供了一种基于WDM系统的色散调整方法，包括：
通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时 间进入到第二业务中断时间；
当确定业务中断时间为第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；
当确定业务中断时间为第二业务中断时间时，在初始化参数所得到默认色散补偿搜索范围内，搜索所需色散补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿。
根据本申请第二方面，本申请提供了一种基于WDM系统的色散调整装置，包括：
业务中断时间确定模块，用于通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是持续到第二业务中断时间；
第一色散补偿模块，用于在确定业务中断时间为第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；
第二色散补偿模块，用于在确定业务中断时间是第二业务中断时间时，在初始化参数确定的默认色散补偿搜索范围内，搜索所需色散值补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿。
附图说明
图1是现有的固定色散补偿法的原理示意图；
图2是现有的二分法搜索色散补偿值的原理示意图；
图3是本申请的色散搜索补偿法的原理示意图；
图4是实现工程应用保护的示意图；
图5是本申请的基于WDM系统的色散调整方法的示意图；
图6是本申请的核心算法的流程图；
图7是本申请的基于WDM系统的色散调整装置的原理图。
具体实施方式
图3显示了本申请的色散搜索补偿法的原理，即考虑了实际应用场景的特点即OTN光网络传输距离基本固定以及每次业务恢复后不一定重新搜索的情况，在实际工程现场应用获取稳定色散补偿值后，增加记忆功能，即保存稳定色散补偿值色，以便自动调整色散搜索策略，自动调整搜索范围，从而减少系统恢复时间，提高整个系统稳定性与客户满意度。
在图3所示的色散搜索补偿法原理中，保存在实际工程现场应用获取两个稳定色散补偿值如最优值-1600和次最优值-2000，在保护倒换场景发生后，直接查找已经保存的两个实际光网络所需的色散补偿值，因而最多进行两次色散补偿值查找。本申请相对于图1所示的固定色散补偿法(只适合固定长度的线路)，能够应用于不同长度的线路，可以快速恢复业务；相对于图2所示的二分 法搜索色散补偿值方法，则可以大大缩短寻找色散补偿值的次数，从而缩短了搜索时间。
工程应用时，一般为1+1光层保护或1：n光层保护。两种工程现场实际应用场景简化示意图如图4所示。在1+1光层保护场景中，通常涉及2个默认色散补偿值，这两个默认色散补偿值是实际光网络所需的色散补偿值。
图5显示了本申请的一种基于WDM系统的色散调整方法，该方法可以应用于1+1光层保护也可以应用于1：n光层保护，为了便于描述，本申请以1+1光层保护为例进行说明。
本申请的一种基于WDM系统的色散调整方法，包括：
通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时间进入到第二业务中断时间；
当确定业务中断时间是第一业务中断时间，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；
当确定业务中断时间是第二业务中断时间，在初始化参数所得到默认色散补偿搜索范围内，搜索所需色散值补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿。
需要说明的是，本申请的初始化参数所得到的色散补偿值是实际光网络所需的色散补偿值，可以使用相关技术获得。本申请保存实际光网络所需的色散补偿值，并通过初始化参数加载该色散补偿值。
另一方面，业务中断时间是否进入到第二业务中断时间取决于在第一业务中断时间对WDM系统进行色散补偿后业务是否恢复，若业务恢复，则取消业务中断时间。这表明，本申请是否在第二业务中断时间对WDM系统进行色散补偿，取决于在第一业务中断时间对WDM系统进行色散补偿的结果；若对WDM系统进行色散补偿的结果为业务未恢复，则在第二业务中断时间，搜索所需色散补偿值，对WDM系统进行色散补偿；反之，则停止色散补偿值操作。
一般来说，在1+1光层保护相关路径没有发生变化的情况下，本申请能够利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿，恢复业务。但是在1+1光层保护相关路径发生变化时(发生概率较小)，业务中断时间就会进入到第二业务中断时间。
如果业务中断时间进入第二业务中断时间，本申请则需要搜索色散补偿值，验证尝试搜索到的色散补偿值，直至利用搜索到的所需色散补偿值对WDM系统进行色散补偿，在色散补偿之后，用搜索到的所需色散补偿值更新初始化参数所得到的色散补偿值，以便在下一次第一业务中断时间，利用更新后的色散补偿值对WDM系统进行色散补偿。也就是说，本申请将保存的更新后的色散补偿值作为下一次初始化参数的默认值，以便在下一次第一业务中断时间，利用该更新后的色散补偿值对WDM系统进行色散补偿。
本申请的初始化参数所得到的当前色散补偿值至少包括：色散补偿最优值和色散补偿次优值。 本申请利用初始化参数所得到的当前色散补偿值对WDM系统进行色散补偿包括：
利用初始化参数得到的色散补偿最优值或色散补偿次优值交替对WDM系统进行色散补偿；
若利用初始化参数得到的色散补偿最优值对WDM系统进行色散补偿后业务恢复，则把初始化参数得到的色散补偿最优值和色散补偿次优值继续作为当前色散补偿最优值和色散补偿次优值；
若利用初始化参数得到的色散补偿次优值对WDM系统进行色散补偿后业务恢复，则把初始化参数得到的色散补偿次优值和色散补偿最优值作为当前色散补偿最优值和当前色散补偿次优值。
本申请的第一业务中断时间或时间段和第二业务中断时间或时间段可以根据实际需要确定，在本申请一个实例中，第一业务中断时间是业务中断后0ms至30ms的时间或时间段，第二业务中断时间是业务中断时间大于30ms的时间或时间段。
在一个实例中，在第二业务中断时间通过包括色散粗调和色散微调的二分法得到所需色散补偿值。
图6显示了本申请的实现色散调整方法的核心处理算法处理流程，如下：
a)在步骤S10，初始化系统参数，包括默认色散补偿搜索范围[min_val,max_val],色散补偿最优值A_val，色散补偿次优值B_val.由于本申请只考虑1+1光层保护场景，故只涉及2个默认色散补偿值，实际应用过程中，1：n场景时，可扩展色散补偿优选值的个数，但最多不超过4个。
b)在步骤S20，判断业务中断时间是否小于30ms，若小于30ms，则流程进入步骤S30,反之流程则进入步骤S60。在步骤S30，用初始化系统参数时得到的色散补偿值【A_val,B_val】优先尝试，然后流程进入步骤S40。在步骤S40，判断业务是否可以恢复，若可以恢复，且最终所需要色散补偿值与上次色散值相同，则在步骤S50保持色散补偿A_val,色散补偿值B_val不变；若不同，则在步骤S50，将最终所需要色散补偿值作为当前色散补偿值，例如若最终所需要色散补偿值为B_val，则将B_val作为色散补偿最优值，将A_val作为色散补偿次优值，流程结束。
c)在步骤S60，利用初始化参数时的默认搜索范围，即用户配置的搜索范围[min_val,max_val]搜索色散补偿值。此流程主要防止两通信链路发生永久性改变。通过二分法搜索到所需色散值后，需要更新A_val与B_val取值。即把当前色散值最优值记录为新的A_val,上次最优值记录为初始化系统参数时得到的B_val；然后流程进入到步骤S70结束。
本申请在光层保护1+1应用环境开局时，手动写入选择色散搜索范围[min_val,max_val],不写入A_val,B_val.第一次开通业务时，由于没有A_val与B_val,业务处理时间较长，通过业务相关工作路径、保护路径的业务切换，系统可自动学习到A_val，B_val.后期当不论是工作路径、还是保护路径发生业务闪断时，色散补偿值可以快速锁定，保证业务恢复。即本申请可记忆当前线路状态，进而节省业务恢复时间。
本申请在无光层保护应用环境开局时，手动写入选择色散搜索范围[min_val,max_val],不写 入A_val,B_val.第一次开通业务时，由于没有A_val与B_val,业务处理时间较长。但后期业务闪断时，只要光路传输距离不变，整个系统的业务恢复时间会相较之前有很大提高。
图7显示了本申请的基于WDM系统的色散调整装置的原理，如图7所示，本申请的一种基于WDM系统的色散调整装置包括：
业务中断时间确定模块，用于通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时间进入到第二业务中断时间，该业务中断时间确定模块可以是在业务中断后启动的计时器，通过计时确定业务中断进入第一业务中断时间或进入到第二业务中断时间；
第一色散补偿模块，用于在确定业务中断时间是第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；本申请的第一色散补偿模块在第一业务中断时间读取初始化参数所得到的色散补偿值，然后用所读取的色散补偿值对WDM系统进行色散补偿；
第二色散补偿模块，用于在确定业务中断时间是第二业务中断时间时，在初始化参数确定的默认色散补偿搜索范围内，搜索所需色散值补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿；本申请的第二色散补偿模块在第二业务中断时间读取初始化参数所得到的色散补偿搜索范围，然后在色散补偿搜索范围搜索所需色散值补偿值，并对WDM系统进行色散补偿。
本申请的基于WDM系统的色散调整装置还可以包括色散补偿值更新模块，用于在利用搜索到的所需色散补偿值对WDM系统进行色散补偿之后，用搜索到的所需色散补偿值更新初始化参数所得到的色散补偿值，以便在下一次第一业务中断时间，利用更新后的色散补偿值对WDM系统进行色散补偿。
此外，本申请的基于WDM系统的色散调整装置还可以包括初始化模块，用于通过初始化参数得到至少包括色散补偿最优值和色散补偿次优值的色散补偿值。初始化模块在每次初始化参数时，从色散补偿值更新模块提取更新后的色散补偿值，从而得到初始化参数时的色散补偿值。
下表显示了本申请的色散搜索方法与相关技术的固定值色散搜索方法和二分法的有益效果的比较。
Figure PCTCN2021099814-appb-000001
本申请可应用于超100G支持QPSK/8QAM/16QAM/32QAM/64QAM/128QAM等可支持电层色散补偿的DWDM通信网络，应用场景包括：政企网领域点对点单跨段组网的IDC网、正常应用场景下的传统电信网络等。
与相关技术相比，本申请可与实际应用相匹配，即记录当前实际光网络所需要色散补偿值，减少色散补偿值搜索次数，进而极大节省保护倒换时间，提升产品竞争力，业务稳定性。即本申请解决了固定色散补偿的灵活性问题，也解决了二分查找的用时问题。通过记录之前系统的特性来优化系统业务恢复时间。
相对于相关技术，本申请通过记录当前实际光网络所需要色散补偿值，减少色散补偿值搜索次数，进而极大节省保护倒换时间，提升产品竞争力，业务稳定性。
尽管上文对本申请进行了详细说明，但是本申请不限于此，本技术领域技术人员可以根据本申请的原理进行各种修改。因此，凡按照本申请原理所作的修改，都应当理解为落入本申请的保护范围。

Claims (10)

  1. 一种WDM系统的色散调整方法，包括：
    通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时间进入到第二业务中断时间；
    当确定业务中断时间是第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；
    当确定业务中断时间是第二业务中断时间时，在初始化参数所得到色散补偿搜索范围内，搜索所需色散补偿值，并利用搜索到的所述所需色散补偿值对WDM系统进行色散补偿。
  2. 根据权利要求1所述方法，其中，所述在利用搜索到的所需色散补偿值对WDM系统进行色散补偿之后，用搜索到的所需色散补偿值更新所述初始化参数所得到的色散补偿值，以便在下一次第一业务中断时间，利用更新后的色散补偿值对WDM系统进行色散补偿。
  3. 根据权利要求1所述方法，其中，所述初始化参数所得到的色散补偿值至少包括色散补偿最优值和色散补偿次优值。
  4. 根据权利要求3所述方法，其中，利用初始化参数所得到的色散补偿值对WDM系统进行色散补偿包括：
    利用初始化参数得到的色散补偿最优值或色散补偿次优值对WDM系统进行色散补偿；
    若利用初始化参数得到的色散补偿最优值对WDM系统进行色散补偿后业务恢复，则把初始化参数得到的色散补偿最优值和色散补偿次优值继续作为当前色散补偿最优值和色散补偿次优值；
    若利用初始化参数得到的色散补偿次优值对WDM系统进行色散补偿后业务恢复，则把初始化参数得到的色散补偿次优值和色散补偿最优值作为当前色散补偿最优值和当前色散补偿次优值。
  5. 根据权利要求1所述方法，其中，所述第一业务中断时间是业务中断后0ms至Nms的时间，N为大于0的任何数。
  6. 根据权利要求1所述方法，其中，所述第二业务中断时间是业务中断时间大于Nms的时间。
  7. 根据权利要求5所述方法，其中，在所述第二业务中断时间，通过包括色散粗调和色散微调的二分法得到所需色散补偿值。
  8. 一种WDM系统的色散调整装置，包括：
    业务中断时间确定模块，用于通过对业务中断时间进行监测，确定业务中断时间是第一业务中断时间还是从第一业务中断时间进入到第二业务中断时间；
    第一色散补偿模块，用于在确定业务中断时间是第一业务中断时间时，利用初始化参数所得到的色散补偿值，对WDM系统进行色散补偿；
    第二色散补偿模块，用于在确定业务中断时间是第二业务中断时间时，在初始化参数确定的 默认色散补偿搜索范围内，搜索所需色散值补偿值，并利用搜索到的所需色散补偿值对WDM系统进行色散补偿。
  9. 根据权利要求8所述装置，其中，还包括色散补偿值更新模块，用于在利用搜索到的所需色散补偿值对WDM系统进行色散补偿之后，用搜索到的所需色散补偿值更新初始化参数所得到的色散补偿值，以便在下一次第一业务中断时间，利用更新后的色散补偿值对WDM系统进行色散补偿。
  10. 根据权利要求8所述装置，其中，还包括初始化模块，用于通过初始化参数得到至少包括色散补偿最优值和色散补偿次优值的色散补偿值。
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