Wavelength converter apparatus and method of performing wavelength conversion

A wavelength converter apparatus comprising:

• a first phase modulator configured to perform phase modulation on pump light in accordance with a first phase modulation signal;
• a second phase modulator configured to perform phase modulation on signal light in accordance with a second phase modulation signal;
• a wavelength converter configured to multiplex the signal light having undergone the phase modulation with the pump light having undergone the phase modulation, the wavelength converter configured to perform wavelength conversion on the signal light in accordance with the pump light;
• a detector configured to detect a modulation component from the signal light having undergone the phase modulation and the pump light having undergone the phase modulation;
• and
• a generator configured to generate the first phase modulation signal and the second phase modulation signal so as to minimize the detected modulation component, and adjust a first delay amount of the first phase modulation signal and a second delay amount of the second phase modulation signal according to the detected modulation component.