Patent ID: 8805129

Claim:
An optical device comprising: a substrate having a waveguide region and a mounting region; a planar lightwave circuit (PLC) waveguide including a lower-clad layer and an upper-clad layer that each have a waveguide portion disposed on the waveguide region, the lower-clad layer further having a mounting portion disposed on the mounting region, and a platform core between the waveguide portions of the lower-clad layer and the upper-clad layer; a terrace defined by etching the mounting portion of the lower-clad layer, the terrace comprising an interlocking part; an optical active chip mounted on the mounting region of the substrate, the optical active chip comprising a chip core therein; a chip alignment mark disposed on a mounting surface of the optical active chip, the chip alignment mark protruding from the mounting surface so as to extend from the mounting surface of the optical active chip into the interlocking part, wherein the optical active chip is aligned by interlocking between the interlocking part and the chip alignment mark, and the optical active chip is mounted on the mounting region; and a solder film disposed on the chip alignment mark so as to be within the interlocking part, the solder film protruding from a bottom surface of the chip alignment mark so as to protrude farther into the interlocking part than the chip alignment mark.