Patent ID: 9323002
Filing Date: 2016-04-26
CPC Classification: G02B

Claim Text:
1. A light multiplexer comprising: an optical waveguide array device that emits a light beam along an optical axis; a diffraction grating being of a planar form, for reflecting or transmitting the light beam, and having a plurality of straight gratings formed in parallel to each other so as to diffract the light beam; a substrate; a holder for holding the diffraction grating along a first side of the diffraction grating that is radially offset from the optical axis; and a supporter for securely supporting the holder on the substrate in a state in which an empty gap is defined between a bottom surface of the holder and an upper surface of the substrate so that both of the holder and the diffraction grating are not brought into contact with the substrate, to reduce displacement in grating pitch of the diffraction grating caused by a change in temperature of the substrate, wherein the diffraction grating has a second side that (a) is perpendicular to the upper surface of the substrate, radially offset from the optical axis, and (b) has no supporter situated thereon, wherein the bottom surface of the holder is parallel to the upper surface of the substrate, wherein the holder also includes a side perpendicular to the bottom surface, and is thus in a form of an L shape having an inner corner at an intersection of the bottom surface and the side, and wherein the diffraction grating has a corner that abuts the inner corner.