access icon free Experimental demonstration of a 10BASE-T Ethernet visible light communications system using white phosphor light-emitting diodes

In this study, a compact design of a highly efficient, and a high luminosity light-emitting diode (LED)-based visible light communications system is presented, which is capable of providing standard room illumination levels and also wide-coverage Ethernet 10BASE-T optical wireless downlink communications over a distance of 2.3 m using commercial white light phosphor LEDs. The measured signal-to-noise ratio of the designed Ethernet system is >45 dB, thus allowing error-free communications with both on–off keying non-return zero and differential Manchester-coded modulation schemes at 10 Mbps. The uplink has been provided via a wireless infra-red link. A comparative study of a point-to-point wired local area network (LAN) and the optical wireless link confirms no discernible differences between them. The design of the transmitter is also shown to be scalable, with the frequency response for driving 25 LEDs being almost the same as driving a single LED. LED driving units are designed to match with the Ethernet sockets (RJ45) that conform to the existing LAN infrastructures (building and portable devices).

Inspec keywords: phosphors; light emitting diodes; optical communication equipment; amplitude shift keying; wireless LAN; frequency response; optical links

Other keywords: signal-to-noise ratio; wireless infrared link; point-to-point wired local area network; error-free communications; frequency response; on–off keying nonreturn zero modulation schemes; 10BASE-T Ethernet visible light communications system; white phosphor light-emitting diodes; optical wireless downlink communications; LAN infrastructures; differential Manchester-coded modulation schemes

Subjects: Display technology; Light emitting diodes; Computer communications; Free-space optical links; Radio links and equipment; Phosphors; Modulation and coding methods; Optical communication equipment

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