| 摘要 |
PROBLEM TO BE SOLVED: To improve a single-mode yield and obtain a high output efficiency on a side of a front end surface in a gain-coupled distributed feedback semiconductor laser. SOLUTION: Asymmetric coating is applied to the gain-coupled distributed feedback semiconductor laser; wherein a front end surface 13 for emitting laser light is covered with a coating with low reflectivity, and a rear end surface 15 is covered with a coating with high reflectivity. Further, an absorbing diffraction grating 10 is provided along an optical waveguide, and a phase shift structure 11 is provided on the diffraction grating. The mentioned structure can improve the single-mode yield of an oscillation wavelength, and can improve output efficiency on the side of the front end surface 13. COPYRIGHT: (C)2007,JPO&INPIT
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