| 摘要 |
PROBLEM TO BE SOLVED: To provide a light control device which has an improved broad band property of 20 GHz or more even in a light control device having a folded bent part in a signal electrode. SOLUTION: In the light control device having a substrate having electrooptic effect, optical waveguides 31 to 33 formed on the substrate, and a modulation electrode modulating an optical wave propagated in the optical waveguide, the modulation electrode is a symmetric or asymmetric CPW electrode which is composed of signal electrodes 41, 42 and ground electrodes 61 to 63; the signal electrode from signal input end parts 51, 52 of the signal electrode to a start point (b) of an operation part (s) performing modulation of the optical wave propagated in the optical waveguide is an input side signal electrode part; the electrode has a bent part R folding back wiring in at least a part of the input side signal electrode part, and thickness of the substrate of a region in which the bent part exists is 30 to 100μm. COPYRIGHT: (C)2011,JPO&INPIT |
