Patent Number: 7,046,881

Title: Manufacturing method for optical coupler/splitter and method for adjusting optical characteristics of planar lightwave circuit device

Abstract: The present invention relates a method for manufacturing an optical coupler/splitter. A Y-shaped waveguide core is formed by focusing a laser beam into a cladding layer that is formed from a glass material. At least one portion of this Y-shaped waveguide core other than the input port and the output ports is treated as a refractive index adjustment area. After the portions of the Y-shaped waveguide core other than the refractive index adjustment area have been formed by focusing a laser beam, signal light is inputted into the input port of the Y-shaped waveguide core and the signal light outputted from the output ports of the Y-shaped waveguide core are monitored. The refractive index of the refractive index adjustment area is determined based on the result of the monitoring and is adjusted by focusing a laser beam repeatedly.

Inventors: Sakuma; Ken (Sakura, JP), Ishikawa; Shimon (Sakura, JP), Shikata; Tomoko (Sakura, JP), Ogawa; Hirokuni (Sakura, JP), Hosoya; Hideyuki (Sakura, JP), Wada; Akira (Sakura, JP)

Assignee: Fujikura, Ltd.

International Classification: G02B 6/26 (20060101); G02B 6/10 (20060101)

Expiration Date: 5/16/02018