OPTICAL SIGNAL SELECTION SWITCH

摘要

PROBLEM TO BE SOLVED: To provide an optical signal selection switch where crosstalk occurring between output ports is suppressed.

SOLUTION: The optical signal selection switch includes: at least one input port; a plurality of output ports; a condenser lens which condenses an optical signal emitted from the at least one input port; and deflecting means which gives phase shifts to the optical signal condensed by the condenser lens and reflects the optical signal so that the optical signal to which the phase shifts are given is coupled with the output ports via the condenser lens. A period of a phase-shifted waveform in one output port due to the deflecting means is different from 1/i (i is an integer other than 0) of periods of the phase-shift waveform in the other output ports due to the deflecting means, so that crosstalk between ports can be suppressed because, in one output port, diffracted light of second and higher orders of the other output ports are not coupled.

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