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31 May 2013 Architecture of an all optical de-multiplexer for spatially multiplexed channels
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Multiple channels of light can propagate through a multimode fiber without interfering with each other and can be independently detected at the output end of the fiber using spatial domain multiplexing (SDM). Each channel forms a separate concentric ring at the output. The typical single pin-diode structure cannot simultaneously detect and demultiplex the multiple channel propagation supported by the SDM architecture. An array of concentric circular pindiodes can be used to simultaneously detect and de-multiplex the SDM signals; however, an all optical solution is generally preferable. This paper presents simple architecture for an all optical SDM de-multiplexer.
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Syed H. Murshid, Michael F. Finch, and Gregory L. Lovell "Architecture of an all optical de-multiplexer for spatially multiplexed channels", Proc. SPIE 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV, 872014 (31 May 2013);

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