| 摘要 |
PURPOSE:To provide an optical modulator device capable of performing high definition communication even when intensity modulation arises due to dust, etc. CONSTITUTION:An optical modulator device is provided with two corner cubes 1A, 1B as retroreflectors, two optical modulators 4A, 4B, an electrostriction element driver 5 having an electrostriction element, a Glan-Thompson prism 2 as a light branching /combining means and a changing means for polarization state. The Glan-Thompson prism 2 branches an incident light beam on a branching/combining surface 2d and separates it into a transmission light beam (P polarization) and a reflection light beam (S polarization). Electric field is applied to an electrostriction element by means of an electrostriction element driver 5 and, when its shape is changed, the electrostriction element approaches the total reflection surfaces 1a of the corner cubes 1A, 1B. Thus, the reflectivity is changed. At this time, the transmission light beam (P polarization) and the reflection light beam (S polarization) are intensity modulated on the total reflection surfaces 1a of the corner cubes 1A, 1B. When the intensity modulated transmission light beam (P polarization) and the reflection light beam (S polarization) are combined on the branching/combining surface 2d. polarization modulation is performed as a result. |
