To provide a wavelength converter permitting to simplify its structure and also transmit excellent output signal light, and thereby contribute to cost reduction of an optical communication system.
This device is arranged to be a wavelength converter A1 comprising a 1st light source 1 for transmitting continuous light CW, a 2nd light source 2 for transmitting signal light Pin of which the wavelength is not controlled, and a wavelength conversion means 3 for modulating at least either the luminous intensity or the phase of the continuous light CW from the 1st light source 1 by the signal light P in from the 2nd light source 2 and outputting it as an output signal light Pout. Moreover, the 1st light source is comprised of a light source outputting plural wavelengths and a wavelength selection means having a wavelength selecting function, and can input continuous light of an arbitrary wavelength to a wavelength conversion means. Further, the 1st light source is comprised of a wavelength variable light source and its control means, and is able to input continuous light of an arbitrary wavelength the wavelength conversion means.
ITO TOSHIO
OKADA AKIRA
MAGARI KATSUAKI
ISHIHARA NOBORU
