| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical circuit device for demultiplexing and multiplexing, capable of being relatively easily manufactured, having relative low wavelength dependency, and in which a cavity is not easily formed on a branch part. SOLUTION: An optical circuit having a cladding part formed of a transparent film formed on a base plate and a band-shaped core part formed on a part of the cladding part and having the relative high refractive index is provided with at least one independent first core part 31 and at least two independent second cores 32. The first core part 31 has a part having the width gradually narrowed toward one direction, and the second core parts 32 are arranged on both sides of the part having the narrowed width of the first core part 31 along the first core part 31 so as to be separated from the first core part 31. |
