Patent ID: 7333729

Claim:
An optical transmitter comprising an encoder for encoding multi-wavelength pulses corresponding to electric sending data by use of time spread/wavelength hopping in accordance with an encoding pattern of the encoder itself, wherein the encoder concurrently executes time delay for every wavelength component at encoding, and time delay due to pre-compensation processing to pre-compensate for difference in propagation time for every wavelength component, occurring due to chromatic dispersion characteristics of a transmission line between the optical transmitter and an optical receiver opposed thereto by α% (0≦α≦100), wherein the encoder is capable of varying time delay amounts for every wavelength component, wherein the encoder comprises a circulator, a wavelength multiplexer/demultiplexer, and movable mirrors in number corresponding to the number of wavelengths, and input light entering from an input terminal is delivered to the wavelength multiplexer/demultiplexer by the circulator to be demultiplexed into respective wavelength components, the respective wavelength components being reflected by the movable mirrors provided for the respective wavelength components, light rays reflected from the movable mirrors provided for the respective wavelength components, respectively, being multiplexed by the wavelength multiplexer/demultiplexer, and multiplexed light being sent out to an output terminal via the circulator to thereby execute time delay for the respective wavelength components.