TW200610990A - Light wave guide device, light source device and light information processor - Google Patents

Abstract

The object of the invention is to provide an optical waveguide device which is small in light loss, can be made small in size and low in cost, is small in the polarization dependency of transmittance and reflectance by a filter, and multiplexes or demultiplexes a plurality of light beams having different wavelength by segmenting the wavelength of transmitted light and the wavelength of reflected light in a narrower range, and to provide a light source device suitable as a point light source device for a compact display or the like and an optical information processing device which use the optical waveguide device. An optical waveguide layer 2 composed of an assembly of a clad 3 having the shape of a pentagon ABCDE where a side DE and a side BA cross at an acute angle of 45 degrees, and cores 4 to 6 is formed in the optical waveguide device. The core 4 is linearly provided from the side AB to a side CD nearly perpendicularly to the side AB, and the cores 5 and 6 are linearly provided from the side DE to a crossing part 7 or 9 crossing with the core 4 nearly perpendicularly to the side DE. Wavelength selecting filters 8 and 10 are provided at the crossing parts so as to part the core 4. In multiplexing the light, light is made incident from light incident or emitting end faces 11 to 13, and multiplexed light is taken out from a light emitting or incident end face 14.