WO2018227983A1 - 基于wson网络控制平面实时计算光通道osnr的方法 - Google Patents

基于wson网络控制平面实时计算光通道osnr的方法 Download PDF

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WO2018227983A1
WO2018227983A1 PCT/CN2018/075059 CN2018075059W WO2018227983A1 WO 2018227983 A1 WO2018227983 A1 WO 2018227983A1 CN 2018075059 W CN2018075059 W CN 2018075059W WO 2018227983 A1 WO2018227983 A1 WO 2018227983A1
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osnr
optical
link
osc
factor
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张炳焱
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烽火通信科技股份有限公司
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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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07953—Monitoring or measuring OSNR, BER or Q
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0261—Optical medium access at the optical multiplex section layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing

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  • the present invention relates to the field of optical channel design, and in particular to a method for real-time calculation of optical channel OSNR based on a WSON network control plane.
  • WSON is an Automatically Switched Optical Network (ASON) based on WDM (Wavelength Division Multiplexing) transport network.
  • ASON Automatically Switched Optical Network
  • WDM Widelength Division Multiplexing
  • GMPLS Generalized Multiprotocol Label Switching
  • the control plane technology such as the exchange protocol, and the PCE (Path Compute Element), implements dynamic scheduling of wavelength routing, realizes intelligentization of wavelength scheduling, and improves the flexibility of WDM network scheduling and the efficiency of network management.
  • OSNR Optical Signal Noise Ratio
  • the object of the present invention is to provide a method for real-time calculation of optical channel OSNR based on WSON network control plane for real-time calculation of optical channel OSNR.
  • a method for real-time calculation of optical channel OSNR based on WSON network control plane comprising the following steps:
  • the OSNR of the optical multiplex section is taken as the OSNR of the TE link corresponding to the optical multiplex section and recorded in the TE link attribute;
  • Steps S1 to S3 are repeated to obtain the OSNR of the remaining TE links in the WSON network, and the information of the remaining TE link attributes is flooded to the TE link database of each control node in real time;
  • step S6 Calculate the OSNR of the corresponding TE link from step S4 according to the obtained TE link set, and calculate the optical channel OSNR.
  • step S1 optical multiplexing is performed by calculating an OSNR factor of each of the plurality of optical transmission segments included in the optical multiplexing segment, and performing an OSNR factor transmission between the optical transmission segments by using an overhead of the optical monitoring channel.
  • the OSNR of the segment is a technical solution that specifies a technical solution that specifies a technical solution to be performed.
  • step S1 specifically includes the following steps:
  • the near-end control plane calculates the number of channels that are connected to the TE link corresponding to the optical multiplex section, and initializes the cumulative OSNR factor to have a value of 0;
  • the near-end control plane transmits the number of channels and the value of the accumulated OSNR factor to the near-end OSC disk corresponding to the TE link;
  • the near-end OSC disk transmits the number of channels and the accumulated OSNR factor to the relay station OSC disk downstream and adjacent thereto;
  • the relay station OSC disk calculates an OSNR factor of the optical transport segment corresponding thereto, and accumulates the cumulative OSNR factor transmitted by the near-end OSC disk;
  • the accumulated cumulative OSNR factor is sequentially transmitted to the downstream OSC disk according to the upstream and downstream relationship, and the OSNR factor of the optical transmission segment corresponding to the OSC disk is accumulated every time it is transmitted to an OSC disk until it is transmitted to the remote OSC disk;
  • the remote OSC disk calculates an OSNR factor of the optical transmission segment corresponding thereto, and accumulates the cumulative OSNR factor of the OSC disk located upstream of the remote OSC disk to obtain a final cumulative OSNR factor;
  • the remote OSC disc reports the final cumulative OSNR factor to the remote control plane, and the remote control plane calculates the OSNR of the optical multiplex section.
  • the OSNR factors of the respective optical transmission segments are calculated by the number of channels opened by the TE link and the input optical power of the optical amplifier corresponding to each optical transmission segment, and the OSNR factor is completed by the overhead of the optical monitoring channel. Transmission between optical transmission segments.
  • the expression of the OSNR factor of the optical transmission segment is calculated as Where P inj represents the input optical power of the jth optical amplifier, NF j represents the noise figure of the jth optical amplifier, and M is the number of channels in which the TE link is turned on.
  • the formula for calculating the optical channel OSNR is:
  • OSNR out is the optical channel OSNR and OSNR j represents the OSNR of each TE link.
  • the information of the TE link attribute is flooded to the TE link database of each control node in real time through the OSPF-TE protocol.
  • the method for calculating the optical channel OSNR in real time based on the WSON network control plane of the present invention since each OSC disk automatically calculates the OSNR of the corresponding optical multiplex section, which is equivalent to automatically calculating the OSNR value corresponding to each TE link.
  • the optical channel OSNR can be calculated, and the existing control plane routing calculation algorithm can be conveniently extended to obtain an optical channel path that meets the design standard.
  • FIG. 2 is a flow chart of calculating the OSNR of an optical multiplex section in the present invention.
  • the present invention provides a method for real-time calculation of optical channel OSNR based on a WSON network control plane, the method comprising the following steps:
  • An optical multiplex section is usually composed of a plurality of optical transmission segments.
  • an OSNR of an optical multiplex section is obtained by calculating an OSNR factor of each of the plurality of optical transmission segments included in the optical multiplex section, and the OSNR factor passes through the optical monitoring channel.
  • the overhead completes the transfer between the optical transport segments. Referring to FIG. 2, the following steps are specifically included:
  • the near-end control plane calculates the number of channels that are connected to the TE link corresponding to the optical multiplex section, and initializes the cumulative OSNR factor to have a value of 0;
  • the control planes at both ends of the optical multiplex section are defined as a near-end control plane and a remote control plane, wherein a control plane for starting the calculation of OSNR is a near-end control plane.
  • the near-end control plane initiates the calculation of the OSNR timer and then calculates the number of channels that are turned on.
  • the near-end control plane transmits the number of channels and the value of the accumulated OSNR factor to the near-end OSC disk corresponding to the TE link;
  • the near-end OSC disk transmits the number of channels and the accumulated OSNR factor to the relay station OSC disk downstream and adjacent thereto;
  • the relay station OSC disk calculates an OSNR factor of the optical transport segment corresponding thereto, and accumulates the cumulative OSNR factor transmitted by the near-end OSC disk;
  • the OSNR factor of each optical transmission segment is calculated by the number of channels opened by the TE link and the input optical power of the optical amplifier corresponding to each optical transmission segment, and the OSNR factor is completed between the optical transmission segments by the overhead of the optical monitoring channel. Transfer.
  • the OSNR factor of the optical transport segment is automatically calculated by the relay site OSC disk.
  • the expression for calculating the OSNR factor of the optical transport segment is Where P inj represents the input optical power of the jth optical amplifier, NF j represents the noise figure of the jth optical amplifier, and M is the number of channels in which the TE link is turned on. Among them, when the optical amplifier model is determined, NF j is a constant value.
  • the accumulated cumulative OSNR factor is sequentially transmitted to the downstream OSC disk according to the upstream and downstream relationship, and the OSNR factor of the optical transmission segment corresponding to the OSC disk is accumulated every time it is transmitted to an OSC disk until it is transmitted to the remote OSC disk;
  • the remote OSC disk calculates an OSNR factor of the optical transmission segment corresponding thereto, and accumulates the cumulative OSNR factor of the OSC disk located upstream of the remote OSC disk to obtain a final cumulative OSNR factor;
  • the OSC disk automatically calculates the OSNR factor of the corresponding optical transmission segment, and the calculation method is calculated. The same as in step S14. Specifically, if there are three OSC disks A, B, and C between the relay site OSC disk and the remote OSC disk, the upstream and downstream sequences are A to B and then C. At this time, A calculates the OSNR factor of the optical transmission segment corresponding thereto, and then accumulates the cumulative OSNR factor transmitted by the relay station OSC disk, and the accumulated result is denoted as a, and the accumulated OSNR factor at this time is a.
  • B calculates the OSNR factor of the corresponding optical transmission segment, and then accumulates the cumulative OSNR factor a transmitted by A.
  • the accumulated result is denoted as b, and the accumulated OSNR factor at this time is b.
  • the same is transmitted to C, so that the accumulated OSNR factor is c, and the final accumulated OSNR factor is c, and the OSNR factor of the optical transmission segment corresponding to the remote OSC disk is obtained, and the final accumulated OSNR factor is obtained.
  • the remote OSC disc reports the final cumulative OSNR factor to the remote control plane, and the remote control plane calculates the OSNR of the optical multiplex section.
  • the formula for calculating the OSNR of the optical multiplex section in the present invention is:
  • P inj represents the input optical power of the jth optical amplifier
  • NF j represents the noise figure of the jth optical amplifier
  • M is the number of channels in which the TE link is turned on.
  • the OSNR of the optical multiplex section is taken as the OSNR of the TE link corresponding to the optical multiplex section and recorded in the TE link attribute;
  • a TE link corresponds to an optical multiplex section.
  • the OSNR of an optical multiplex section is calculated, the OSNR of the TE link is also obtained.
  • Steps S1 to S3 are repeated to obtain the OSNR of the remaining TE links in the WSON network, and the information of the remaining TE link attributes is flooded to the TE link database of each control node in real time;
  • the WSON network calculates the optical path according to the entire network topology. The calculation is performed at the source node of the service.
  • the network topology is generated according to each TE link in the network.
  • Each control node in the network generates the TE link of this node, and the entire network floods to each node, so that each node has the TE link of the entire network, forming the topology of the entire network.
  • the information of the TE link attribute is flooded to the TE link database of each control node in real time through the OSPF-TE protocol.
  • the OSNR of all TE links has been calculated in the above steps, and the calculation of the optical channel OSNR requires only those TE links included in its path.
  • step S6 Calculate the OSNR of the corresponding TE link from step S4 according to the obtained TE link set, and calculate the optical channel OSNR.
  • the formula for calculating the optical channel OSNR is:
  • OSNR out is the optical channel OSNR and OSNR j represents the OSNR of each TE link.
  • each OSC disk automatically calculates the OSNR of the corresponding optical multiplex section, so that the OSNR value corresponding to each TE link can be automatically calculated, and finally the optical channel can be calculated.
  • OSNR which conveniently extends the existing control plane routing calculation algorithm, and obtains an optical channel path that meets the design criteria.

Abstract

本发明公开了一种基于WSON网络控制平面实时计算光通道OSNR的方法，涉及光通道设计领域，该方法包括以下步骤：S1.根据一条光复用段两端的控制平面和所述光复用段各站点OSC盘计算所述光复用段的OSNR；S2.将光复用段的OSNR作为与该光复用段对应的TE链路的OSNR并记录在TE链路属性中；S3.将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；S4.重复步骤S1至S3，得到WSON网络中其余TE链路的OSNR，并将其余TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；S5.计算通道路由，得到与通道路由对应的TE链路集合；以及S6.根据所得到的TE链路集合，从步骤S4中找到对应的TE链路的OSNR，计算光通道OSNR。本发明能实时计算光通道OSNR。

Description

基于WSON网络控制平面实时计算光通道OSNR的方法 技术领域
本发明涉及光通道设计领域，具体涉及一种基于WSON网络控制平面实时计算光通道OSNR的方法。
背景技术
WSON是基于WDM(Wavelength Division Multiplexing，波分复用)传送网的ASON(Automatically Switched Optical Network，自动交换光网络)，通过将控制平面引入波长网络，采用GMPLS(Generalized Multiprotocol Label Switching，通用多协议标志交换协议)和PCE(Path Compute Element，路径计算单元)等控制平面技术，实现波长路由的动态调度，实现波长调度的智能化，提高WDM网络调度的灵活性和网络管理的效率。
在有损WSON网络中为了建立一条连接(采用某个波长的光通道)，需要确定一条路由(即要经过的链路和节点)，同时要为这条连接分配一个合适的波长，更重要的是要保证这条路由(即光通道)的信号质量满足标准的传输特性。
在目前100G或超100G相干光网络中，衡量光通道信号质量一个重要的指标是OSNR(Optical Signal Noise Ratio，光信噪比)，选择一条OSNR满足设计标准的光通道路径是实现波长智能调度的基本要求。在有损的WSON网络中，控制平面实时计算光通道路径的OSNR是选择有效的光通道路径的前提，对控制平面的有效性和高效性有很大的影响。因此，如何实时计算光通道OSNR显得尤为重要。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种能实时计算光通道OSNR的基于WSON网络控制平面实时计算光通道OSNR的方法。
为达到以上目的，本发明采取的技术方案是：
一种基于WSON网络控制平面实时计算光通道OSNR的方法，该方法包括以下步骤：
S1.根据一条光复用段两端的控制平面和所述光复用段各站点OSC盘计算所述光复用段的OSNR；
S2.将光复用段的OSNR作为与该光复用段对应的TE链路的OSNR并记录在TE链路属性中；
S3.将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
S4.重复步骤S1至S3，得到WSON网络中其余TE链路的OSNR，并将其余TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
S5.计算通道路由，得到与通道路由对应的TE链路集合；以及
S6.根据所得到的TE链路集合，从步骤S4中找到对应的TE链路的OSNR，计算光通道OSNR。
在上述技术方案的基础上，步骤S1中，通过计算光复用段所包括的多个光传送段各自的OSNR因子，并通过光监控信道的开销完成OSNR因子在光传送段间传送来得到光复用段的OSNR。
在上述技术方案的基础上，所述步骤S1具体包括以下步骤：
S11.近端控制平面计算与该光复用段对应的TE链路开通的波道数目，并初始化累计OSNR因子，使其值为0；
S12.近端控制平面将波道数目和累计OSNR因子的值传送至TE链路对应的近端OSC盘；
S13.近端OSC盘将波道数目和累计OSNR因子传送到下游并与其相邻的中继站点OSC盘；
S14.中继站点OSC盘计算与之对应的光传送段的OSNR因子，并累加近端OSC盘传来的累计OSNR因子；
S15.累加后的累计OSNR因子按上下游关系依次传送到下游的OSC盘中，每传送到一个OSC盘便累加与该OSC盘对应的光传送段的OSNR因子，直至传送到远端OSC盘；
S16.远端OSC盘计算与之对应的光传送段的OSNR因子，并累加与位于远端OSC盘上游且相邻的OSC盘的累计OSNR因子，得到最终的累计OSNR因子；
S17.远端OSC盘将最终的累计OSNR因子上报给远端端控制平面，由远端控制平面计算光复用段的OSNR。
在上述技术方案的基础上，通过TE链路开通的波道数目和每个光传送段对应的光放大器的输入光功率计算各个光传送段各自的OSNR因子，OSNR因子通过光监控信道的开销完成在光传送段间的传送。
在上述技术方案的基础上，计算光传送段的OSNR因子的表达式为
Figure PCTCN2018075059-appb-000001
式中P inj表示第j个光放大器的输入光功率，NF j表示第j个光放大器的噪声指数，M为TE链路开通的波道数目。
在上述技术方案的基础上，远端端控制平面计算光复用段的OSNR的公式为：
Figure PCTCN2018075059-appb-000002
在上述技术方案的基础上，计算光通道OSNR的公式为：
Figure PCTCN2018075059-appb-000003
其中，OSNR out为光通道OSNR，OSNR j表示每条TE链路的OSNR。
在上述技术方案的基础上，通过OSPF-TE协议将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中。
与现有技术相比，本发明的优点在于：
本发明的基于WSON网络控制平面实时计算光通道OSNR的方法，由于每个OSC盘都是自动计算与之对应的光复用段的OSNR，从而相当于可以自动计算每条TE链路对应的OSNR值，最后便可计算出光通道OSNR，方便地扩展目前的已有的控制平面路由计算算法，得到满足设计标准的光通道路径。
附图说明
图1为本发明中计算光通道OSNR的流程图；
图2为本发明中计算光复用段的OSNR的流程图。
具体实施方式
以下结合附图对本发明作进一步详细说明。
参见图1所示，本发明提供一种基于WSON网络控制平面实时计算光通道OSNR的方法，该方法包括以下步骤：
S1.根据一条光复用段两端的控制平面和所述光复用段各站点OSC盘计算所述光复用段的OSNR；
一条光复用段通常由多条光传送段组成，本发明中采用计算光复用段所包括的多个光传送段各自的OSNR因子的方式来得到光复用段的OSNR，OSNR因子通过光监控信道的开销完成在光传送段间的 传送。参见图2所示，具体包括以下步骤：
S11.近端控制平面计算与该光复用段对应的TE链路开通的波道数目，并初始化累计OSNR因子，使其值为0；
将光复用段两端的控制平面定义为近端控制平面和远端控制平面，其中用于启动计算OSNR的控制平面为近端控制平面。近端控制平面启动计算OSNR定时器，然后再计算开通的波道数目。
S12.近端控制平面将波道数目和累计OSNR因子的值传送至TE链路对应的近端OSC盘；
针对近端OSC盘不需要计算与之对应的光传送段的OSNR因子。
S13.近端OSC盘将波道数目和累计OSNR因子传送到下游并与其相邻的中继站点OSC盘；
S14.中继站点OSC盘计算与之对应的光传送段的OSNR因子，并累加近端OSC盘传来的累计OSNR因子；
本发明中通过TE链路开通的波道数目和每个光传送段对应的光放大器的输入光功率计算各个光传送段各自的OSNR因子，OSNR因子通过光监控信道的开销完成在光传送段间的传送。光传送段的OSNR因子是由中继站点OSC盘自动计算完成的。计算光传送段的OSNR因子的表达式为
Figure PCTCN2018075059-appb-000004
式中P inj表示第j个光放大器的输入光功率，NF j表示第j个光放大器的噪声指数，M为TE链路开通的波道数目。其中，当光放大器型号确定时，NF j即为常值。
S15.累加后的累计OSNR因子按上下游关系依次传送到下游的OSC盘中，每传送到一个OSC盘便累加与该OSC盘对应的光传送段的OSNR因子，直至传送到远端OSC盘；
S16.远端OSC盘计算与之对应的光传送段的OSNR因子，并累加与位于远端OSC盘上游且相邻的OSC盘的累计OSNR因子，得 到最终的累计OSNR因子；
针对步骤S15和S16，在中继站点OSC盘和远端OSC盘之间存在着多个OSC盘，每经过一个OSC盘，该OSC盘就会自动计算与其对应的光传送段的OSNR因子，计算方法和步骤S14中相同。具体的，若中继站点OSC盘和远端OSC盘之间存在A、B和C三个OSC盘，其上下游顺序为A到B再到C。此时，A计算与其对应的光传送段的OSNR因子，然后累加上由中继站点OSC盘传送过来的累计OSNR因子，累加结果记为a，此时的累计OSNR因子为a。接着B计算与其对应的光传送段的OSNR因子，然后累加上由A传送过来的累计OSNR因子a，累加结果记为b，此时的累计OSNR因子为b。然后同理传送到C，使得累计OSNR因子为c，最终累计OSNR因子为c再加上与远端OSC盘对应的光传送段的OSNR因子，就得到最终的累计OSNR因子。
S17.远端OSC盘将最终的累计OSNR因子上报给远端端控制平面，由远端控制平面计算光复用段的OSNR。
本发明中计算光复用段的OSNR的公式为：
Figure PCTCN2018075059-appb-000005
式中P inj表示第j个光放大器的输入光功率，NF j表示第j个光放大器的噪声指数，M为TE链路开通的波道数目。
S2.将光复用段的OSNR作为与该光复用段对应的TE链路的OSNR并记录在TE链路属性中；
一条TE链路是与一条光复用段相对应的，当计算出一条光复用段的OSNR后，相当于也得到了TE链路的OSNR。
S3.将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
S4.重复步骤S1至S3，得到WSON网络中其余TE链路的OSNR，并将其余TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
WSON网络是根据整个网络拓扑来计算光通道路经，计算是在业务的源节点来完成的，网络拓扑根据网络中每条TE链路来生成。网络中每个控制节点都会生成此节点的TE链路，全网泛洪到每个节点，这样每个节点就有整个网络的TE链路，形成整个网络的拓扑。本发明中通过OSPF-TE协议将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中。
S5.计算通道路由，得到与通道路由对应的TE链路集合；
在上述步骤中已经计算出所有TE链路的OSNR，而计算光通道OSNR只需要其路径所包括的那些TE链路即可。
S6.根据所得到的TE链路集合，从步骤S4中找到对应的TE链路的OSNR，计算光通道OSNR。
本发明中，计算光通道OSNR的公式为：
Figure PCTCN2018075059-appb-000006
其中，OSNR out为光通道OSNR，OSNR j表示每条TE链路的OSNR。
采用本发明中的计算方法后，由于每个OSC盘都是自动计算与之对应的光复用段的OSNR，从而相当于可以自动计算每条TE链路对应的OSNR值，最后便可计算出光通道OSNR，方便地扩展目前的已有的控制平面路由计算算法，得到满足设计标准的光通道路径。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细 描述的内容属于本领域专业技术人员公知的现有技术。

Claims (8)

  1. 一种基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于，该方法包括以下步骤：
    S1.根据一条光复用段两端的控制平面和所述光复用段各站点OSC盘计算所述光复用段的OSNR；
    S2.将光复用段的OSNR作为与该光复用段对应的TE链路的OSNR并记录在TE链路属性中；
    S3.将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
    S4.重复步骤S1至S3，得到WSON网络中其余TE链路的OSNR，并将其余TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中；
    S5.计算通道路由，得到与通道路由对应的TE链路集合；以及
    S6.根据所得到的TE链路集合，从步骤S4中找到对应的TE链路的OSNR，计算光通道OSNR。
  2. 如权利要求1所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于：步骤S1中，通过计算光复用段所包括的多个光传送段各自的OSNR因子，并通过光监控信道的开销完成OSNR因子在光传送段间传送来得到光复用段的OSNR。
  3. 如权利要求2所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于：所述步骤S1具体包括以下步骤：
    S11.近端控制平面计算与该光复用段对应的TE链路开通的波道数目，并初始化累计OSNR因子，使其值为0；
    S12.近端控制平面将波道数目和累计OSNR因子的值传送至TE链路对应的近端OSC盘；
    S13.近端OSC盘将波道数目和累计OSNR因子传送到下游并与其相邻的中继站点OSC盘；
    S14.中继站点OSC盘计算与之对应的光传送段的OSNR因子，并累加近端OSC盘传来的累计OSNR因子；
    S15.累加后的累计OSNR因子按上下游关系依次传送到下游的OSC盘中，每传送到一个OSC盘便累加与该OSC盘对应的光传送段的OSNR因子，直至传送到远端OSC盘；
    S16.远端OSC盘计算与之对应的光传送段的OSNR因子，并累加与位于远端OSC盘上游且相邻的OSC盘的累计OSNR因子，得到最终的累计OSNR因子；
    S17.远端OSC盘将最终的累计OSNR因子上报给远端端控制平面，由远端控制平面计算光复用段的OSNR。
  4. 如权利要求3所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于：通过TE链路开通的波道数目和每个光传送段对应的光放大器的输入光功率计算各个光传送段各自的OSNR因子，OSNR因子通过光监控信道的开销完成在光传送段间的传送。
  5. 如权利要求4所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于：计算光传送段的OSNR因子的表达式为
    Figure PCTCN2018075059-appb-100001
    式中P inj表示第j个光放大器的输入光功率，NF j表示第j个光放大器的噪声指数，M为TE链路开通的波道数目。
  6. 如权利要求5所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于，远端端控制平面计算光复用段的OSNR的公式为：
    Figure PCTCN2018075059-appb-100002
  7. 如权利要求6所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于，计算光通道OSNR的公式为：
    Figure PCTCN2018075059-appb-100003
    其中，OSNR out为光通道OSNR，OSNR j表示每条TE链路的OSNR。
  8. 如权利要求1所述的基于WSON网络控制平面实时计算光通道OSNR的方法，其特征在于：通过OSPF-TE协议将TE链路属性的信息实时泛洪到每个控制节点的TE链路数据库中。
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