| 摘要 |
<p>A polarization coupler in which a polarization maintaining fiber is employed and a process of producing such polarization coupler are disclosed. Where the polarization coupler is used, beams of light from two laser diodes can be introduced into a single optical fiber and light for the monitoring can be split from a main signal output. Since minimum components required to realize the function are a rotator (8), a birefringent plate 10 and two or three polarization maintaining fibers (2, 4, 6), the polarization coupler is superior in operability in production and is suitable for the miniaturization. The branching ratio of light for the monitoring can be adjusted by adjustment of the angle of rotation of light by the rotator (8).</p> |
