| 摘要 |
PURPOSE:To perform polarization compensation which is stable to the polarization state of single-mode fiber projection light by splitting incident light into two orthogonal linear polarized components, and rotating only one component and then multiplexing both components after passing them through optical paths differing in length. CONSTITUTION:A light wave projected from a single-mode fiber 1 is split into two mutually orthogonal linear polarized components by birefringent crystal 3, and they are coupled with polarization maintaining fibers 4 and 5 respectively. The polarization maintaining fibers 4 and 5 has some difference in fiber length so that two light waves do not interfere with each other when multiplexed by a light guide type Y-shaped multiplexer 6 while only one linear polarized component is rotated by 90 deg.. In this case, axes of polarization are so adjusted that both components propagating in the polarization maintaining fibers 4 and 5 are multiplexed efficiently on the incidence light guide 7 of the light guide type Y- shaped multiplexer 6. |
