| 摘要 |
An optical device, comprising a core layer (11) having a branch guided wave passage, a first clad layer (12) having the core layer stacked on a part of the surface thereof, a second clad layer (13) holding the core layer together with the first clad layer, a third clad layer (14) stacked on the second clad layer, heating electrodes (15, 16), and a substrate (17) having a heat sink function, wherein at least one of the core layer, first clad layer, and second clad layer is formed with an optical material having a positive refraction factor change coefficient, and the refraction factor of the third clad layer is made smaller than that of the second clad layer.
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