Patent ID: 6169838
Filing Date: 2001-01-02
Classification: G01J,G02B

Abstract:
An integrated temperature compensated optical waveguide diffraction grating device comprising: an input region having an input port, an output region having at least a plurality of predetermined light receiving locations, a first slab waveguide region having a first temperature coefficient of refractive index, said slab waveguide region being optically coupled with the input and output regions for partially confining a beam of light launched from the input region between two substantially parallel planes, a diffraction grating disposed to receive a beam of light launched from the input port through the slab waveguide region and to separate the beam into sub-beams of light of different wavelengths to the plurality of predetermined light receiving locations, a second slab waveguide region adjacent to the first slab waveguide region having a predetermined shape and predetermined dimensions, said second slab waveguide region, which constitutes a temperature compensation region, having a second different temperature coefficient of refractive index than the first slab waveguide region for providing temperature compensation of the device.