| 摘要 |
In a distributed feedback type semiconductor laser device having a waveguide structure for outputting a signal light from a front side of the waveguide structure and a monitoring light from a rear side of the waveguide structure, an active layer is formed above a semiconductor substrate, and an optical guide layer having a diffraction grating is provided. A coupling coefficient of the waveguide structure is gradually increased from the front side of the waveguide structure to the rear side of the waveguide structure.
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