一、全光网的概念自从光纤被引入通信网以来，它已为通信的发展作出了重要的贡献。随着通信网传输容量的增加，光纤通信技术也发展到了一个新的高度。光的复用技术如波分复用（WDM）、时分复用（TDM）、空分复用（SDM）越来越来受到人们的重视，但在以这些技术为基础的现有通信 First, the concept of all-optical network Since the optical fiber was introduced into the communications network, it has made an important contribution to the development of communications. With the increase of communication network transmission capacity, optical fiber communication technology has also developed to a new height. Optical multiplexing technologies such as Wavelength Division Multiplexing (WDM), Time Division Multiplexing (TDM), and Spatial Division Multiplexing (SDM) are gaining more and more attention, but existing technologies based on these technologies