光纤通信子系统测试程序 第2-13部分：数字系统 误差矢量幅度的测量

[中文适用范围]： 本部分IEC 61280-2系列定义了从一组测量符号计算光学n-APSK信号的均方根误差矢量幅度的程序。它特别定义了参考状态的归一化和测量符号状态的最佳缩放程序。 本文档描述的程序适用于单极化光信号以及具有独立调制极化支路的传统极化复用信号。一般来说，不建议将这些程序不经修改地应用于同时调制光幅度、相位和极化状态以编码信息数据的信号。 本文件没有规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机，并且可以根据传输的n-APSK信号的类型而变化。这些和可选的附加信号处理步骤在特定应用文件中定义。 [外文原描述]： 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.