Patent ID: 7092145

Claim:
An optical wavelength converter for converting input phase-modulated light at a first wavelength to output phase-modulated light at a second wavelength, the wavelength converter comprising: an input-light splitter splitting the input phase-modulated light at the first wavelength into first split light at the first wavelength and second split light at the first wavelength; a multiplex-interference portion multiplex-interfering the first split light and the second split light to generate intensity-modulated light having the first wavelength, the multiplex-interference portion including an injection synchronization laser diode generating continuous wave light at the first wavelength, and a multiplex optical coupler multiplexing the continuous wave light at the first wavelength and generated by the injection synchronization laser diode and the second split light at the first wavelength to produce the intensity-modulated light; a laser diode generating continuous wave light at the second wavelength; and a phase modulation portion receiving the intensity-modulated light and the continuous wave light at the second wavelength from the laser diode, cross-phase modulating the continuous wave light at the second wavelength in response to phase modulation of the input phase-modulated light.