| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrooptic SSB modulator which is driven with low power, and which highly efficiently operates in a high frequency area of 10 GHz or higher even when it has a compact construction, and an optical frequency shifter. SOLUTION: Optical waveguides 2a, 2b are combined with standing wave type resonant electrodes 3a, 3b on an electrooptic crystal board 1 where polarization reversal structures 1a are implemented. The different polarization reversal structures 1a are implemented for the respective optical waveguides 2a, 2b, and the standing wave electric field over the resonant electrodes 3a, 3b is used to perform an optical modulation, thereby obtaining a sine modulation effect and a cosine modulation effect at the same time. Only supplying a single type of modulation signal from a modulation signal source 6 can perform the sine and cosine modulations. The modulation signal is resonated over the resonant electrodes 3a, 3b to obtain a high electric field, whereby an efficient modulation effect can be realized even in a high frequency area higher than 10 GHz. COPYRIGHT: (C)2008,JPO&INPIT
|
