Bidirectional Communication refers to the exchange of information between two parties in both directions. In this process, both sender and receiver can transmit and receive data, allowing for interactive communication. This method is used in various systems, including telecommunication networks, computer networks, and real-time data exchange applications, enabling dynamic and continuous information flow.

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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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