Patent ID: 8023775

Claim:
An optical frequency comb generator, comprising: a wave-guide portion; a driving signal system; and a bias signal system, wherein the wave-guide portion having: an optical input port; a branching port configured to branch light from the optical input port; a first wave-guide, on which one of lights branched by the branching port propagates; a second wave-guide, other light branched by the branching port propagates; and a couple portion couples a light signal outputted from the first wave-guide and a light outputted from the second wave-guide, wherein the driving signal system is configured to obtain a first driving signal which drives the first wave-guide and a second driving signal which drives the second wave-guide, wherein the bias signal system is configured to obtain bias signals added to the first wave-guide and the second wave-guide, wherein the driving signal system and the bias signal system drive the first driving signal, the second driving signal and the bias signals in accordance with the following equation (II): Δ A=Δθ=π/ 4 (II), wherein the ΔA and the Δθ are (A 1 −A 2 ) and (θ 1 −θ 2 )/2, respectively, A 1 and A 2 are amplitudes of optical phase shift signals of the first driving signal and the second driving signal, respectively, θ 1 and θ 2 are optical phase shifts induced by difference in wavelength and bias signal within the first wave-guide and the second wave-guide, respectively.