| 摘要 |
A polarization independent tunable filter/receiver for optical communications. The tunable filter, operating as a directional coupler, has three waveguides including a central, feedguide (32) and a pair of branch waveguides (34, 36). Through either electro-optic effects or free carrier injection, the TM and TE polarization modes of the central wavelength can be coupled from the feedguide (32) to the appropriate branch guide. The separated modes can be either detected independently (40, 42) or reunited in phase for further processing.
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