| 摘要 |
<p>A walk-off device (e.g., 21) is used to split an incoming beam into two parallel outgoing beams having orthogonal polarization. A polarization flipper (e.g., 23) is positioned to change the polarization of one of the two beams exiting from the walk-off device so that the two beams are parallel and have essentially identical polarizations. A nonreciprocal device (e.g., 51) receives the two beams, and the resulting apparatus is a polarization independent nonreciprocal device. Conversely, a polarization flipper flips the polarization of one of the two parallel beams of like polarizations into orthogonal polarizations and subsequently a walk-off device combines or superimposes these two beams to form an unpolarized single beam. <IMAGE></p> |
