1.引言光开关(OSW)和可变光衰减器(VOA)在光网络中扮演着重要角色。VOA通过对传输光功率的衰减来实现对光信号的适时控制,主要用于DWDM系统中信道的光功率平衡,实 1. Introduction Optical switch (OSW) and Variable Optical Attenuator (VOA) play an important role in optical networks. VOA through the attenuation of transmitted optical power to achieve timely control of optical signals, mainly for the DWDM system, the channel optical power balance, real