Patent ID: 7095551

Claim:
A wavelength converter comprising: a first semiconductor optical amplifier configured to generate an optical noise, and to generate and output a first optical source by amplifying the generated optical noise if a current is applied to the first semiconductor optical amplifier; first and second distributed Bragg reflectors configured to reflect only a component of a specified wavelength range among components of the optical noise and to apply the reflected component to the first semiconductor optical amplifier; and a second semiconductor optical amplifier configured to receive an optical source divided from the optical source reflected by and outputted from the first distributed Bragg reflector and an input data optical source, to generate and output a second optical source by changing a phase of the divided optical source according to a digital signal from the input data optical source; wherein the first and second optical sources outputted from the first and second semiconductor optical amplifiers are added together, and a signal of which the wavelength is converted through either a constructive interference or a destructive interference of the added first and second optical sources is outputted.