| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce an insertion loss in an optical switch utilizing a thermooptic effect. SOLUTION: A Y type core 4, which is branched into two cores (branched cores 5a, 5b) via a branching part 4b on the way, is provided in a clad layer 3, branching part heaters 11, 13 heating the branching part 4b and branched core heaters 12, 14 heating the branched cores 5a, 5b are provided, and the branching part beaters 11, 13 and the branched core heaters 12, 14 are separately controlled.</p> |
