| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an optical semiconductor device with which highly precise optical modulation is efficiently carried out, an optical phase control device, an optical intensity control device, and a method for manufacturing the optical semiconductor device. <P>SOLUTION: An optical modulator 1A has isolation electrodes 2a, 2b and 2c, isolation electrodes 3a, 3b and 3c and conductive region 8 to form a modulation region on optical waveguides 5a and 5b on a substrate 1. The isolation electrodes 2a, 2b and 2c are mounted on a signal line 2 on the side opposite to a ground line 3 with the optical waveguides 5a and 5b interposed in between, and further, the signal line 2 is extended to the side of the ground line 3 on the substrate 1. As a result, a region (an overlap region 9) where the signal line 2 and the optical waveguides 5a and 5b overlap with one another is present. Consequently a conductive region 8 is formed on a region other than a region corresponding to the overlap region 9, that is, a region on the substrate 1 opposite to the signal line with the optical waveguides 5a and 5b interposed in between. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
