Patent ID: 7171084
Filing Date: 2007-01-30
Classification: G02B

Abstract:
1. An optical apparatus provided with a function of demultiplexing a wavelength division multiplexed light, comprising: a first lens converting an input light into a parallel light; a second lens condensing the parallel light converted by said first lens onto a one-dimensional direction; and an optical device having opposed parallel reflective planes in which the light condensed by said second lens is incident between said respective reflective planes in parallel to the planes, a part of said incident light is transmitted through one of the reflective planes to be emitted while said incident light being multi-reflected by the respective reflective planes, and the emitted lights interfere with each other to form a plurality of optical beams traveling directions of which are different from each other, according to wavelengths, wherein said apparatus further comprises an element changing an optical phase which is disposed between said first and second lenses, and the parallel light converted by said first lens is given to said second lens via said element.