ARRAY WAVEGUIDE TYPE WAVELENGTH MULTIPLEXING/ DEMULTIPLEXING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To reduce the loss of optical propagation in branching points of a waveguide constituting an optical waveguide circuit and the periphery of these branching points. SOLUTION: Embedded layers 120 composed of the same material as that of cores 103a are prepared in the areas between the adjacent cores 103a of an array waveguide 103 from an input side slab waveguide 102.