Patent ID: 7756423

Claim:
A wavelength division multiplexing optical transmission apparatus for transmitting wavelength division multiplexing optical signals, the apparatus comprising: a plurality of optical transmitting units outputting optical signals having a different wavelength from each other; a plurality of optical intensity modulating units intensity-modulating the optical signals; and a wavelength multiplexing unit multiplexing the optical signals intensity modulated by the plurality of optical intensity modulating units, wherein: the plurality of optical intensity modulating units set the amount of wavelength chirp adapting to each wavelength of the optical signals for the optical signals output from each of the plurality of optical transmitting units; the wavelength multiplexing unit multiplexes the optical signals having the amount of wavelength chirp set respectively and outputs the multiplexed optical signals; there are at least two different values of the wavelength chirp set for the optical signals, and the at least two different values of the wavelength chirp are zero and a negative value; and the plurality of optical intensity modulating units comprise a first Mach-Zehnder modulator having a symmetrical structure for setting the amount of wavelength chirp to a value of zero and a second Mach-Zehnder modulator having an asymmetrical structure for setting the amount of wavelength chirp to a negative value.