| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve problems such as the occurrence of optical signal dispersion caused by polarization and change in characteristics caused by heat generation of a garnet crystal in a conventional optical isolator. <P>SOLUTION: The crystal optical axis 3c of a rutile crystal 3 is oriented so that the separating directions of an ordinary ray O and an extraordinary ray E become vertical to a plane including each optical axis of optical fibers 10, 11. In addition, the converging center optical axis 6c of a converging rod lens 6 is arranged parallel to each optical axis of the optical fibers 10, 11, and at a position nearly equidistant from each of the four light beams, namely, the ordinary ray O and the extraordinary ray E propagating on the optical axis side of the optical fiber 10 and those propagating on the optical axis side of the optical fiber 11. Further, between the converging rod lens 6 and the magnetizing garnet crystal 8, there is provided an air gap 7 of approximately 200 [μm] as a heat insulating means. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
