Coherent Transmission refers to a method in optical communication where the phase, amplitude, and frequency of the transmitted signal are carefully controlled. This technique enhances signal quality, allowing for higher data rates and improved noise resistance. Coherent transmission is often used in long-distance fiber optic communications, enabling more efficient and reliable data transmission over large distances.

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400-Gb/s mode division multiplexing-based bidirectional free space optical communication in real-time with commercial transponders

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In this work, for the first time, we experimentally demonstrate mode division multiplexing-based bidirectional free space optical communication in real-time using commercial transponders. As proof of concept, via bidirectional pairs of Hermite-Gaussian modes (HG00, HG10, and HG01), using a Telecom Infra Project Phoenix compliant commercial 400G transponder, 400-Gb/s data signals (56-Gbaud, DP-16QAM) are bidirectionally transmitted error free, i.e., with less than 1e-2 pre-FEC BERs, over approximately 1-m of free space

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