Space And Naval Warfare Systems Center is a U.S. military research organization focused on defense technologies in space and naval domains. NEC Labs America studies its advancements in secure communication, sensing, and AI systems. Collaboration opportunities in underwater sensing and secure optical networking reflect the alignment between applied research and national security needs.

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Coherent optical wireless communication link employing orbital angular momentum multiplexing in a ballistic and diffusive scattering medium

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We experimentally investigate the scattering effect on an 80 Gbit/s orbital angular momentum (OAM) multiplexed optical wireless communication link. The power loss, mode purity, cross talk, and bit error rate performance are measured and analyzed for different OAM modes under scattering levels from ballistic to diffusive regions. Results show that (i) power loss is the main impairment in the ballistic scattering, while the mode purities of different OAM modes are not significantly affected; (ii) in the diffusive scattering, however, the performance of an OAM-multiplexed link further suffers from the increased cross talk between the different OAM modes.

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