一、前言 近年来，波分复用（ＷＤＭ）全光网正成为人们研究的热点。与传统的传送网不同的是，ＷＤＭ全光网在电的通道层和物理层之间引入光层，信号的复用、传输、放大、路由以及恢复都在光域上进行。ＷＤＭ全光网对信号的格式、调制方式和比特是透明的，兼容现有的网络和业务 I. Introduction In recent years, wavelength division multiplexing (WDM) all-optical network is becoming a hot spot for people’s research. Different from the traditional transport network, the WDM all-optical network introduces optical layers between the electrical channel layer and the physical layer. Signal multiplexing, transmission, amplification, routing, and restoration are performed in the optical domain. WDM all optical networks on the signal format, modulation and bit is transparent, compatible with existing networks and services