OPTICAL COUPLER AND MANUFACTURE THEREOF

摘要

PURPOSE: To provide an optical coupler and its producing method, which is constituted by means of plural waveguides being substantially in the same planar relation and in which the respective waveguides permit a single coupler output to couple optically to one of 2 coupler outputs. CONSTITUTION: A system is provided with one input and the 2 outputs and also with the plural waveguides being substantially in the same planar relation. The respective waveguides permits the input to be optically connected to one of the 2 outputs. The respective waveguides include first junction J21 having an axial line which is not in parallel with the axial line of the coupler which is connected to the two second junctions (J31 and J32 ) by a bending waveguide section without accompanying a singular point and consists of the plural waveguide sections for connecting n pieces of Y junction arranged along the respective waveguide passages by constituting a tree and branch arrayal. An optical inflection point along one optical waveguide between the input and an n-th junction stage is arranged in one of the n pieces of junction along the waveguide passages.