Patent ID: 9235002
Filing Date: 2016-01-12
CPC Classification: B82Y,G02B,H01S

Claim Text:
1. An integrated semiconductor device comprising: a substrate including a first portion, a second portion, and a third portion that are arranged in a waveguiding direction; a first waveguide provided on the first substrate portion, the first waveguide including a base portion and a ridge portion provided on the base portion, the base portion containing a first core layer, the ridge portion extending in the waveguiding direction; a second waveguide provided on the second substrate portion, the second waveguide including a first stripe-shaped mesa on the substrate, the first stripe-shaped mesa containing a second core layer and extending in the waveguiding direction; and a third waveguide provided on the third substrate portion, the third waveguide including a second stripe-shaped mesa containing a third core layer and extending in the waveguiding direction, the third core layer being in direct contact with the second core layer at a butt-jointed portion having a location with respect to the substrate that is between the second and the third substrate portions, the third core layer and the second core layer being optically coupled to each other, wherein the first stripe-shaped mesa of the second waveguide has an end that is connected to the base portion and the ridge portion of the first waveguide at a location with respect to the substrate that is different from location of the butt-jointed portion, the first stripe-shaped mesa is connected to the second strip-shaped mesa at an other end of the first stripe-shaped mesa, and the second core layer is integral with the first core layer.