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PHASE-SENSITIVE AMPLIFIER AND METHOD OF DESIGNING SAME, BPSK SIGNAL PHASE NOISE SUPPRESSOR USING PHASE-SENSITIVE AMPLIFIER, BPSK SIGNAL REGENERATOR, QPSK SIGNAL DEMULTIPLEXER, AND QPSK SIGNAL REGENERATOR
PHASE-SENSITIVE AMPLIFIER AND METHOD OF DESIGNING SAME, BPSK SIGNAL PHASE NOISE SUPPRESSOR USING PHASE-SENSITIVE AMPLIFIER, BPSK SIGNAL REGENERATOR, QPSK SIGNAL DEMULTIPLEXER, AND QPSK SIGNAL REGENERATOR
[Problem] To obtain a large gain-extinction ratio with a small nonlinear effect. [Solution] This phase-sensitive amplifier comprises: a pump beam emission means; a multiplexed beam emission means for multiplexing an inputted signal beam with the pump beam and emitting a multiplexed beam; a phase difference adjustment means for adjusting a relative phase difference between the signal beam and the pump beam; and a nonlinear medium which receives the relatively phase difference adjusted multiplexed beam and causes a parametric process. When a circle is drawn in a complex plane with the origin in the center, said circle having a radius which is a complex amplitude of an output signal beam of the phase-sensitive amplifier in which a target gain-extinction ratio is established to be 20dB or more, the intensity of the pump beam, and a nonlinear constant, a propagation length, and a distribution value of the nonlinear medium, are set such that the complex amplitude of the output signal beam when the phase of the input signal matches a quadrature component is contained in the circle, and the product of the nonlinear constant, the propagation length, and the intensity of the pump beam is less than 1.7rad.
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