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OPTICAL SWITCH

Abstract(summary):

Provided is an optical switch which suppresses deterioration due to crosstalk caused by imperfect spatial light modulation elements. This optical switch includes at least one input port, at least one output port, and a spatial light modulation unit in which the optical signal from the input port is incident and which deflects the optical signal to a selected output port of the output ports. In the spatial light modulation unit, multiple phase distribution units are configured continuously in the switching axis direction, and each of the phase distribution units has one region in which the phase modulation amount increases linearly in accordance with the position of incidence of the signal light onto the spatial light modulation unit, and one region in which the phase modulation amount decreases linearly. The region in which the phase modulation amount increases linearly is larger than the region in which the phase modulation amount decreases linearly, the slope of increase of the phase in one of the phase distribution units is the same as the slope of increase of the phase in an adjacent phase distribution unit, and the period of one of the phase distribution units is configured to be different from the period of an adjacent phase distribution unit.


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