Patent ID: 8078062

Claim:
A carrier-suppressed optical pulse train generating device comprising: a first electric modulation signal generator generating and outputting a first electric modulation signal that is synchronous with a clock signal; a second electric modulation signal generator generating and outputting a second electric modulation signal of a same frequency as the first electric modulation signal and to which a phase difference of δ radians is provided, where δ is a real number satisfying 0≦δ≦π; a two-mode beat light source driven by the first electric modulation signal, and generating and outputting two-mode beat light; and an optical intensity modulator to which the two-mode beat light is inputted, and that optical-intensity-modulates the two-mode beat light, and generates and outputs a carrier-suppressed optical pulse train having numerous longitudinal modes whose longitudinal mode spectra are greater than 2, wherein light transmittance of the optical intensity modulator is modulated by the second electric modulation signal.