Patent ID: 9711939
Date: 2017-07-18
CPC Classifications: G02B,G02F,H01S

Claim:
1. A semiconductor optical device, comprising: a BH waveguide including lattices buried therein and having a buried hetero (BH) structure formed in an optical oscillation region in which single mode light is oscillated; a deep ridge waveguide having a deep ridge structure formed in an optical modulation region; and a passive waveguide formed in a mode transition region interposed between the optical oscillation region and the optical modulation region, formed as a connecting structure of the BH waveguide extending from the optical oscillation region and the deep ridge waveguide extending from the optical modulation region, and inducing evanescent optical coupling, wherein a width of the BH waveguide in the mode transition region is smaller than a width of the deep ridge waveguide in the optical modulation region.