Patent ID: 11880098
Assignee: LUMENTUM JAPAN, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A semiconductor optical device comprising:
a mesa-stripe structure extending in a first direction;
a buried layer configured to bury both sides of the mesa-stripe structure, the buried layer having a side surface opposed to the mesa-stripe structure, the buried layer having an upper surface, the buried layer having an intermediate region between the side surface and the upper surface;
an insulating film on the upper surface of the buried layer and not on a top surface of the mesa-stripe structure; and
an electrode including a mesa electrode on the top surface of the mesa-stripe structure, the electrode including a pad electrode on the insulating film, the electrode including a lead-out electrode between the mesa electrode and the pad electrode,
the upper surface of the buried layer having an outer edge, the outer edge including a first edge extending along the first direction and a second edge extending along a second direction perpendicular to the first direction,
the intermediate region of the buried layer including an upright surface that stands straight between the side surface and the first edge, the intermediate region including a slope surface that slopes more gently than the upright surface and extends downward from the second edge,
the lead-out electrode including a portion on the insulating film and connected to the pad electrode, another portion on the intermediate region and through the slope surface, and another portion connected to the mesa electrode.