| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve an optical semiconductor device which can easily and reliably suppress a gain difference between TE-TM polarization to be not more than an intended value; reduce manufacturing variation among semiconductor substrates; and considerably improve yield in each production lot. <P>SOLUTION: An SOA (Semiconductor Optical Amplifier) includes: a semiconductor substrate 1; and an optical waveguide 11 formed on the semiconductor substrate 1 and including a single active layer 5 having a quantum dot 3 and optically connected. The optical waveguide 11 includes a first region 11a in which one of a TE mode polarization gain and a TM mode polarization gain is larger than the other, and a second region 11b in which the other is larger than the one. As a result, a difference between the TE mode polarization gain and the TM mode polarization gain is adjusted to be within a predetermined range as a whole. <P>COPYRIGHT: (C)2013,JPO&INPIT |
