IEC 61280-2-13:2024系列定义了一种从一组测量符号计算光学n-APSK信号均方根误差矢量幅度的程序。它具体定义了参考状态的归一化和测量符号状态的最佳缩放过程。本文档中描述的过程适用于单偏振光信号以及具有独立调制偏振支路的传统偏振复用信号。一般来说，不建议在不修改的情况下将这些过程应用于信号，其中光振幅、相位和偏振态被同时调制以对信息数据进行编码。 本文档没有指定从接收到的光信号中提取符号的任何信号处理步骤，因为这些步骤取决于光接收器，并且可能因传输的n-APSK信号的类型而异。这些和可选的附加信号处理步骤在特定应用文档中进行了定义。

IEC 61280-2-13:2024 series defines a procedure for calculating the root-mean-square error vector magnitude of optical n-APSK signals from a set of measured symbols. It specifically defines the normalization of the reference states and a procedure for optimal scaling of the measured symbol states. The procedure described in this document applies to single-polarized optical signals as well as to conventional polarization-multiplexed signals with independently modulated polarization tributaries. In general, it is not advisable to apply these procedures without modification to signals, in which optical amplitude, phase, and polarization state are simultaneously modulated to encode the information data. This document does not specify any signal processing steps for extracting the symbols from the received optical signals, because these steps depend on the optical receiver and can vary with the type of the transmitted n-APSK signal. These and optional additional signal processing steps are defined in application-specific documents.