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

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Publication Date: 3/21/2025

Event: Free-Space Laser Communications XXXVII (Conference 13355), Photonics West, SPIE

Reference: pp. 1-8, 2025

Authors: Giacomo Borraccini, NEC Laboratories America, Inc.; Giovanni Milione, NEC Laboratories America, Inc.; Andrea D’Amico, NEC Laboratories America, Inc.; Yue-Kai Huang, NEC Laboratories America, Inc.; Ezra Ip, NEC Laboratories America, Inc.; Jian Fang, NEC Laboratories America, Inc.; Philip N. Ji, NEC Laboratories America, Inc.; Koji Asahi, NEC Corporation; Toshiharu Ito, NEC Corporation; Ting Wang, NEC Laboratories America, Inc.

Abstract: 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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