Patent ID: 7257296
Filing Date: 2007-08-14
Classification: G02B

Abstract:
1. An optical waveguide element having a directional coupler, a light source, and a photodetector, the directional coupler comprising: a first waveguide and a second waveguide located adjacent to each other for mode coupling; a first dummy waveguide extending from an one end of the second waveguide; a reflector installed on an end surface of the first dummy waveguide; and a second dummy waveguide located adjacent to the first dummy waveguide for mode coupling, wherein the directional coupler is configured such that optical signals progressing from the second waveguide to the second dummy waveguide attenuate while sequentially passing through the first dummy waveguide, the reflector, and the second dummy waveguide, and wherein the light source and the photodetector are connected to the first and second waveguides, respectively.