Optical coupler

摘要

Arrayed semiconductor laser elements and optical waveguide cores are formed on a substrate opposite to each other, with a pitch being +/-2 times coupling tolerance respectively, by using different thickness of organic and inorganic layers formed on the substrate and changing refractive indices of a main and a sub core and a cladding layer of the waveguide and a cross section and shape of the main and the sub core, partially along the waveguide.