| CPC G02F 1/2257 (2013.01) [G02F 1/212 (2021.01); G02F 2202/102 (2013.01)] | 11 Claims |
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1. An optical modulator comprising:
a first mesa waveguide extending in a first direction, wherein the first direction is an optical axis direction; and
a second mesa waveguide,
wherein the first mesa waveguide includes a p-type first semiconductor layer disposed over a substrate, a core layer disposed over the p-type first semiconductor layer, a p-type second semiconductor layer disposed over the core layer, and an n-type third semiconductor layer disposed over the core layer, and
wherein the p-type second semiconductor layer and the n-type third semiconductor layer are arranged adjacent to each other in the first direction;
an electrode is disposed over the n-type third semiconductor layer; and
a joining surface between the p-type second semiconductor layer and the n-type third semiconductor layer is inclined with respect to a surface orthogonal to the first direction at an angle of 50° or more to 60° or less.
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