JPS6417029A - Waveguide type optical switch - Google Patents

Abstract

PURPOSE:To obtain the titled switch which decreases losses and the fluctuation in the losses by directly connecting one of two ports of front and rear optical switches to each other, connecting the other to each other via a waveguide crossing part and determining one of the ports on one side of the optical switch elements on the front and rear side as input/output ports. CONSTITUTION:Respective one ports, for example, ports 18, 21 of the ports 18-21 on the respectively two input sides of the optical switch elements 11, 12 on the front side are input ports and the other, for example, ports 19, 20 are leak light ports to escape the leak light. The respective one, for example, ports 22, 25 of the respectively two output side ports 22-25 of the optical switch elements 13, 14 on the rear side are output ports and the respective other, for example, ports 23, 24 are leak light ports for escaping the leak light. The number of the optical switch elements passed with the light between the input port 18 and the output port 25 and between the input port 21 and the output port 22 and the crossed parts is small. The lower losses and the less fluctuation in the losses are thereby obtd.