Patent ID: 8351110
Filing Date: 2013-01-08
Classification: G02F,H04B

Abstract:
1. An optical-signal processing apparatus for amplifying an optical signal by inputting the optical signal and excitation light into a nonlinear optical medium, the optical-signal processing apparatus comprising: a polarizer that is provided at an output terminal of the nonlinear optical medium; and an excitation light adjuster that adjusts polarization states of first excitation light and second excitation light that are input into the nonlinear optical medium, wherein the excitation light adjuster adjusts the polarization states of the first excitation light and the second excitation light so that, when the first excitation light and the second excitation light are input to the polarizer, polarization directions of the first excitation light and the second excitation light are orthogonal to each other, and a difference in angle between the polarization direction of the first excitation light and the polarization direction of the second excitation light, with respect to the polarization main axis of the polarizer, is equal to or smaller than a threshold value.