| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device achieving a low cost in which temperature of an electro-optic material constituting the optical device can be kept nearly constant without performing precise temperature control. SOLUTION: An optical switch 10 having a KTN (KTaNbO) material which induces phase transition between a paraelectric phase and a ferroelectric phase includes an AC driving circuit 17 and heating electrodes 15, 16 electrically connected to the AC driving circuit 17 and disposed near an operational region which is interposed between a phase modulation electrode 13 and a phase modulation electrode 14 and which includes a core 12. In this configuration, the temperature of the KTN material is increased by applying AC power on the heating electrodes 15, 16 so as to keep the temperature in the operational region to be approximately constant higher than the phase transition temperature of the KTN. COPYRIGHT: (C)2007,JPO&INPIT |
