The 4R DEX System is a conceptual digital experience framework built on four core principles: reliability, responsiveness, resilience, and reach. These qualities are vital in distributed and networked systems where consistency, uptime, and adaptability determine success. At NEC Laboratories America (NECLA), the 4R DEX system informs the design of intelligent infrastructures that adapt in real time, supporting research in AI-driven sensing, scalable networking, and resilient enterprise applications

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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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