针对DWDM光网络的核心器件以及影响光网络性能的主要因素之一的光开关 ,概述了其目前的各种技术 ,尤其分析了目前比较成熟、性能比较良好的热光开关和微机械光开关的原理和性能 ,并对其在光网络中的应用进行了分析。 Aiming at the core devices of DWDM optical network and the optical switch which is one of the main factors that affect the performance of optical network, the current technologies are summarized. In particular, the current mature and relatively good performance of the thermo-optical switch and micro-mechanical optical switch Principle and performance, and its application in optical networks were analyzed.