| 摘要 |
<p>[Problem] To provide a semiconductor laser that, compared to conventional semiconductor lasers, realizes a low-cost light source and realizes good single-mode operation with a high side-mode suppression ratio (SMSR). [Solution] A semiconductor laser 100 is provided with one or more rear ports 3a and one front port 3b and with a multi-mode interference optical waveguide 3 that has an active layer (light emitting layer 12) in all regions in plan view. The front port 3b corresponds to an imaging point 4a at which fundamental mode light forms an image in the active layer (light emitting layer 12) perpendicular to the waveguide direction of the multi-mode interference optical waveguide 3, and in plan view the front port 3b is disposed along a central line X 2 , off center with respect to a central line X 0 , along the waveguide direction of the multi-mode interference optical waveguide 3.</p> |
