Wavelength converter

A wavelength converter for generating output signal light in correspondence with input signal light, the input signal light having a first wavelength, and the output signal light having a second wavelength and carrying the same information as the input signal light, the wavelength converter comprising:

• an optical pump source for outputting optical pump light having a third wavelength;
• and
• a resonator comprising an optical fiber and a first and second reflecting means, the first and second reflecting means being disposed on both sides of the optical fiber;
• wherein the input signal light is introduced into the resonator from the first reflecting means, and the optical pump light generates light having a fourth wavelength that is different from the third wavelength of the optical pump light and resonating in the optical fiber between the first and second reflecting means, and
• the output signal light is generated by a nonlinear optical phenomenon between the generated light having the fourth wavelength and the input signal light and is output from the second reflecting means.