| 摘要 |
A light emitting device including a first area and a second area adjacent to the first area in a plan view includes: a substrate formed in the first and second areas; a first cladding layer formed above the substrate in the first area; an active layer formed above the first cladding layer; a second cladding layer formed above the active layer; a guide layer formed above the substrate in the second area; and a core layer formed above the guide layer, wherein the active layer has a first side surface and a second side surface opposite to the first side surface, at least part of the active layer forms a gain area, an end surface of the gain area is provided at least along the second side surface, the core layer has a third side surface adjacent to the end surface of the gain area, which is on the side where the second side surface is present, and a fourth side surface opposite to the third side surface, and light produced in the gain area passes through the end surface of the gain area, which is on the side where the second side surface is present, travels through the core layer to the fourth side surface, and exits therethrough.
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