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Thin-film filters (TFFs) have been widely employed in optical communication systems for their many attractive features, such as very low temperature dependence thus allowing operation without temperature controllers, flat- top passband to minimize the signal distortion, and rel- atively low insertion loss as well as little polarization dependency[1]. Also, modules based on TFFs can be designed to be upgradeable. The performance of cas- caded TFFs in optical add/drop multiplexer (OADM) rin… 相似文献
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