| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress polarization mode dispersion and to minimize a device while avoiding crosstalk. <P>SOLUTION: A first Faraday rotator 133 is disposed in a rear stage of a first birefringence prism 132 and rotates a polarization plane of transmitting light by about 45 degrees. A second birefringent prism 134 is disposed in a rear stage of the first Faraday rotator 133 and has an optical axis in a direction different by about 45 degrees from the optical axis of the first birefringent prism 132. A third birefringent prism 142 is disposed in a rear stage of the second birefringent prism 134, and has an optical axis in a direction different by 80 to 100 degrees from that of the second birefringent prism 134. A second Faraday rotator 143 is disposed in a rear stage of the third birefringent prism 142 and rotates a polarization plane of transmitting light by about 45 degrees. A fourth birefringent prism 144 is disposed in a rear stage of the second Faraday rotator 143 and has an optical axis in a direction different by about 45 degrees from that of the third birefringent prism 142. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
