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13 February 2016 On-chip mode division multiplexing technologies
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Space division multiplexing (SDM) is currently widely investigated in order to provide enhanced capacity thanks to the utilization of space as a new degree of multiplexing freedom in both optical fiber communication and on-chip interconnects. Basic components allowing the processing of spatial modes are critical for SDM applications. Here we present such building blocks implemented on the silicon-on-insulator (SOI) platform. These include fabrication tolerant wideband (de)multiplexers, ultra-compact mode converters and (de)multiplexers designed by topology optimization, and mode filters using one-dimensional (1D) photonic crystal silicon waveguides. We furthermore use the fabricated devices to demonstrate on-chip point-to-point mode division multiplexing transmission, and all-optical signal processing by mode-selective wavelength conversion. Finally, we report an efficient silicon photonic integrated circuit mode (de)multiplexer for few-mode fibers (FMFs).
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Yunhong Ding, Louise F. Frellsen, Xiaowei Guan, Jing Xu, Francesco Da Ros, Haiyan Ou, Christophe Peucheret, Lars H. Frandsen, Leif Katsuo Oxenløwe, and Kresten Yvind "On-chip mode division multiplexing technologies", Proc. SPIE 9774, Next-Generation Optical Communication: Components, Sub-Systems, and Systems V, 977407 (13 February 2016);

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