摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor laser with high reliability and characteristic reproducibility capable of being manufactured at a low cost in a simple manufacturing process. <P>SOLUTION: The semiconductor laser comprises a refractive index modulation region 18 capable of changing refractive index (or a gain modulation region 31 capable of changing a gain) and a vertical coupling region 19 where a Mach-zehnder coupler is formed in a resonator. The refractive index modulation region is formed at a position that meets "(resonator length L)/(integer of 2 or higher)" from one reflecting mirror end face 9A. <P>COPYRIGHT: (C)2012,JPO&INPIT |