Multicore fiber-based mode multiplexer/demultiplexer

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A multicore fiber (MCF)-based mode multiplexer/demultiplexer (MUX/DEMUX) that can overcome the alignment issue of the fiber-based mode MUX/DEMUX is proposed. Design concept and fabrication results of the MCF-based mode MUX/DEMUX for two-spatial-mode operation (LP 01 and LP 11 ) (2M-MUX/DEMUX) and for three-spatial-mode operation (LP 01 , LP 11a , and LP 11b ) (3M-MUX/DEMUX) are presented. The fabricated 2M-MUX/DEMUXes for C-band or L-band, using the same MCF with different elongation ratios demonstrate a coupling efficiency of greater than 90% over each band. Finally, a 3M-MUX/DEMUX with a fan-in/fan-out device is presented. The selective excitation of LP 01 , LP 11a , and LP 11b modes depending on input ports is experimentally demonstrated.

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