Patent ID: 9116317
Filing Date: 2015-08-25
Classification: G02B

Abstract:
1. A planar lightwave circuit having a waveguide-type optical functional circuit formed on a substrate, the planar lightwave circuit comprising: a waveguide region formed only of an optical waveguide that is in contact with a side forming an emission-end face of the optical waveguide for propagating the light emitted from the optical functional circuit or an incident-end face of an optical waveguide for propagating the light incident on the optical functional circuit, wherein only the portion of the bottom of the substrate on which the waveguide region is formed is fixed to an intermediate fixing mount, and wherein the intermediate fixing mount is provided to be fixed to a fixing mount for holding the planar lightwave circuit and a thermal expansion coefficient of the intermediate fixing mount is equivalent to the thermal expansion coefficient of the substrate or is closer in value to the thermal expansion coefficient of the substrate than the thermal expansion coefficient of the fixing mount.