Patent ID: 6775437
Filing Date: 2004-08-10
Classification: G02B

Abstract:
A folded optical waveguide structure comprising a substrate supporting a waveguide slab and an array of laterally spaced grating waveguides extending from the slab along the substrate to propagate optical signals to and from a reflective surface of a mirror member disposed at an end of the substrate; and a thermally conductive body interposed between the mirror member and the substrate, the thermally conductive body being so dimensioned and having a thermal coefficient of expansion such that temperature induced changes in wavelengths of said optical signals propagated along the grating array waveguides and reflected from the reflective surface of the mirror member, including wavelength changes resulting from the thermal coefficient of expansion of said mirror member, are substantially compensated by dimensional changes of the body tilting the mirror member with respect to the grating waveguides at said end of the substrate.