Description XH-DSW-1X2 optical switch module is an optical path control device, has the role of controlling the optical path and converting the optical path; it can realize 2-channel optical signal input, select the signal output of one of the channels (support bi-directional use), the module supports key manual switching and RS-232 serial port command control. It has an important role in optical communication applications. Optical switch is mainly used in optical transmission systems for multiple optical monitoring, LAN multi-source / detector automatic switching, and optical sensing multi-point dynamic monitoring system optical test system for optical fiber, optical devices, network and field engineering optical cable testing; optical device installation and adjustment.