Proceedings of SPIE - the International Society for Optical Engineering
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.
Murshid, S. H., Finch, M. F., & Lovell, G. L. (2013). Architecture of an all optical de-multiplexer for spatially multiplexed channels. Paper presented at the Proceedings of SPIE - the International Society for Optical Engineering, , 8720 doi:10.1117/12.2016207