| 摘要 |
<p>PURPOSE:To compensate a variation component due to the temperature of a polarization plane maintaining fiber for two light beams by detouring light for temperature compensation by an electrooptic effect element, entering light for signal addition into the electrooptic effect element, and converting those two light beams photoelectrically. CONSTITUTION:The circular polarized light lambda1 for signal addition and light lambda2 for temperature compensation are branched into two directions by a beam splitter 3 to guide the light lambda1 to a filter 4, a Pockels effect element 1a, and a beam splitter 5 and the light lambda2 to a filter 5, reflecting plates 7 and 8, and the splitter 5. Then the splitter 5 multiplexes the elliptic polarized light of the light lambda1 and light lambda2 and the composite wave is inputted to a reception part 9 through a B-phase addition part and a C-phase addition part and converted photoelectrically. The phase difference between the component of the light lambda1 and the component of the light lambda2 is detected according to the converted signal and only phase-modulated components which are added by the respective addition part are detected with high accuracy according to the phase difference.</p> |
