Patent ID: 7305160

Claim:
A tunable wavelength optical transmission module, comprising: a laser diode for generating light and outputting the light in a predetermined direction; a first optical switch for selectively providing an optical signal output from the laser diode to a plurality of optical paths; a plurality of planar-type waveguides coupled to the plurality of the output paths of the first optical switch, respectively; a plurality of Bragg gratings having different grating periods to tune a wavelength of the optical signal that passes through a corresponding planar-type waveguide, the Bragg gratings being formed on the planar-type waveguides, respectively, to be connected in parallel to each other; a plurality of heaters respectively formed on the plurality of the planar-type waveguides at locations opposite to those of the Bragg gratings to control reflectance and reflection bands of the Bragg gratings using a thermooptic effect, respectively; a second optical switch for selecting and outputting one of a plurality of optical signals that have their wavelengths tuned through the plurality of the planar-type waveguides, and phase adjustment means for finely controlling the wavelength by changing a mode condition of the waveguide using a thermooptic effect.