波长转换是ＷＤＭ 光网络中一项重要的基础技术。在大型光网络中，它通过波长重用，可以降低网络中因波长竞争而导致的阻塞，提高网络管理、控制和维护的灵活性。文中系统地论述了波长转换技术，首先介绍了ＷＤＭ 光网络中波长转换的必要性，随后分析各种不同的波长转换技术原理，讨论其主要性能及优缺点 Wavelength conversion is an important basic technology in WDM optical network. In large optical networks, it can reduce the blocking caused by wavelength competition in the network through wavelength reuse, and improve the flexibility of network management, control and maintenance. This paper systematically discusses the wavelength conversion technology, first introduced the necessity of wavelength conversion in WDM optical network, and then analyzes the principle of different wavelength conversion technology to discuss its main performance and advantages and disadvantages