OPTICAL SWITCH

摘要

Preliminary system transmitted light beam selecting means (12) comprising a 1x2 optical spatial switch and operating system transmitted light beam branching means (11) are provided in a transmitting unit (24). Received light beam switching means (9) comprising a 2x2 optical spatial switch and comprising a 2x2 optical spatial switch and preliminary system received light beam gate means (10) comprising a 1x2 optical spatial switch are provided in a receiving unit (23). Without using any 4x4 optical spatial switch, an operating system can be switched to a preliminary system. A practical optical switch involving problems such as communication cutoff for maintenance work and low use efficiency of transmission line can be provided.