Patent ID: 8224136
Filing Date: 2012-07-17
Classification: G02B

Abstract:
1. An optical multiplexer/demultiplexer module comprising: a plurality of prisms, each having an inclined surface that is formed by one of the four orthogonal corners of a transparent rectangular solid glass plate being cut and removed at a 45° angle with respect to the end surface; and a frame for housing said plurality of prisms; wherein each of said plurality of prisms has a first end surface through which a first light having a single wavelength that differs for each prism is input toward the inclined surface, or through which a first light that is reflected by the inclined surface is output; a second end surface that forms a filter having wavelength selectivity such that it reflects the first light and lets light having other wavelengths pass through; and a third end surface through which wavelength multiplexed light, which is a multiplexed light having a plurality of different wavelengths, is output or input; and said plurality of prisms are arranged in a row so that when said first light is input from said first end surface of each of said plurality of prisms, that first light is reflected two times, by said inclined surface and said filter, after which the first light is multiplexed with a second light, which passes through the filter, and is output, and when said wavelength multiplexed light is input from said third end surface of one of said plurality of prisms, said first light that is included in that wavelength multiplexed light is reflected two times, by said filter and said inclined surface, and then output from said first end surface, while the light of other wavelengths passes through said filter.