| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an optically functional element which is easily manufactured and improves its manufacturing yield. <P>SOLUTION: The optically functional element includes: a light emitting element 12 as a light source; a dielectric substrate 14 with an optical waveguide 20 formed; and a light receiving element 16 for converting light to electricity. Light from the light emitting element 12 is modulated by an external electric signal, with the modulated light output as an electric signal by the light receiving element 16. The optical waveguide 20 is composed of an input waveguide part 20a formed on the surface 14a of the dielectric substrate 14, branching waveguide parts 20b, 20c divided from the input waveguide part 20a to receive modulation by the external electric signal, and an output waveguide part 20d connected to the modulation part. The optically waveguide 20 is designed such that a plurality of groups of optical waveguides 20A, 20B are formed in the dielectric substrate 14 and that the differences of the designed length of the two branching waveguide parts 20b, 20c in each group are different from each other. The light emitting element 12 and the light receiving element 16 are selected in the optical waveguides of the plurality of groups and arranged in a manner coupling to the optical waveguide that can generate a desired bias phase difference. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
