Optical switch circuit with monitoring function

Abstract

To monitor the operating state of an optical switch without deteriorating the quality of an optical signal in an integrated optical circuit.SOLUTION: The optical switch circuit 101 includes an optical switch 21 in which element switches 11 capable of switching between a cross state and a bar state between two input terminals and two output terminals are arranged in a matrix structure of N rows and N columns, and a monitoring unit 61 that monitors an optical connection state between the input ports and the output ports, with one of the two input terminals of each element switch in the first column as an input port A and the other as an input-side dummy port A {circumflex over ()}, and one of the two output terminals of each element switch in the N-th column as an output port B and the other as an output-side dummy port B {circumflex over ()}. The monitoring part monitors the optical connection state on the basis of the position on the matrix structure of the element switch where the detection light input from the detection light source 55 to the input side dummy port or the output side dummy port is detected.SELECTED DRAWING: Figure 13

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