Patent ID: 8149891

Claim:
A semiconductor optical device comprising: a semiconductor substrate including cleaved facets on respective sides, the cleaved facets being perpendicular to a longitudinal direction of the device; and a waveguide formed on the semiconductor substrate, the waveguide including a linear waveguide portion formed along the longitudinal direction, a bended waveguide portion and an ending waveguide portion formed on at least one side of the semiconductor optical device, the ending waveguide portion being connected to the linear waveguide portion via the bended waveguide portion, and an angled facet formed on an end of the ending waveguide portion opposite to the bended waveguide portion, the angled facet making a first angle with the longitudinal direction and a second angle with the cleaved facets in a width direction of the semiconductor optical device, wherein a light is input or output to or from the angled facet in the longitudinal direction, and an optical axis of the light input or output to or from the angled facet is parallelly-shifted from the linear waveguide portion by a predetermined distance.