Patent ID: 7035551

Claim:
An optical transmitter for transmitting an information signal as a burst signal, comprising: a data unit for outputting the information signal and wavelength information representing a wavelength corresponding to the information signal; a modulating signal processing unit for receiving the information signal and outputting a modulating signal, the modulating signal comprising the information signal and a predetermined electric signal inserted in no-data periods, wherein the no-data periods are periods during which the information signal is absent; a wavelength information processing unit for receiving the wavelength information and outputting a wavelength controlling current, wherein the wavelength controlling current corresponds to the wavelength while the information signal is present, and corresponds to a predetermined wavelength during the no-data periods; a wavelength-tunable light source for outputting light whose wavelength corresponds to the wavelength controlling current; and an optical modulation unit for modulating the light outputted from the wavelength-tunable light source with the modulating signal.