| 摘要 |
PROBLEM TO BE SOLVED: To provide a distribution feedback semiconductor laser device capable of completely covering a diffraction grating by a clad layer without allowing a void to be generated, when the clad layer adjacent to the diffraction grating re-grows. SOLUTION: There are provided an active layer, a clad layer formed adjacently to the active layer, and a diffraction grating periodically formed at predetermined intervals, and the diffraction grating is constituted by a nonconductor generated by oxidization of a semiconductor material, and a distribution of a gain coefficient of the active layer is fluctuated by partly blocking a current injected into the active layer. COPYRIGHT: (C)2006,JPO&NCIPI
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