WAVELENGTH CONVERTER

摘要

A wavelength converter which employs an optical fiber and has high converter efficiency. The polarization planes of a signal light and an exciting light outputted from a laser diode (LD) (103) are respectively controlled by polarization controllers (PC's) (101 and 104) and the phases of the lights are respectively modulated by phase modulators (PM's) (102 and 105) in accordance with modulation signals outputted from an oscillator (110). Then, the output lights from the PM's (102 and 105) are multiplexed by a coupler (106). After the multiplexed signal light and exciting light are amplified by an optical amplifier (EDFA) (107), they are inputted to a dispersion shift fiber (DSP) (108). After wavelength transformation (four light waves mixing (FWM)) is practiced in the DSP, an FWM light is outputted through a band-pass filter (BPF) (109). <IMAGE>