Experimental evaluation of LED-based solar blind NLOS communication links

Abstract

Experimental results are reported demonstrating non-line of sight short-range ultraviolet communication link losses, and performance of photon counting detectors, operating in the solar blind spectrum regime. We employ light emitting diodes with divergent beams, a solar blind filter, and a wide field-of-view detector. Signal and noise statistics are characterized, and receiver performance is demonstrated. The effects of transmitter and receiver elevation angles, separation distance, and path loss are included.

Light-emitting Ga-oxide nanocrystals in glass: a new paradigm for low-cost and robust UV-to-visible solar-blind converters and UV emitters

“…3 Based on these properties, several applications of Ga oxide nanophases have been envisaged in recent years in the eld of light-emitting materials, 4,5 in optoelectronics, 6,7 and in the elds of sensors and communication systems. 8,9 Much of the interest is in the efficient light emission, whose broad excitation at wavelengths shorter than 280 nm is strictly related to the direct allowed optical gap of the material. The main luminescence band is centered in the blue region at around 460 nm and is connected to radiative recombination at donor and acceptor pairs (DAPs).…”

“…Importantly, we also show how the population of intrinsic acceptor and donor sites can be controlled by selective doping. In this way, UV and blue emissions can be optimized for different purposes, including solar-blind UV-to-blue converters 8,9 and UV-emitting devices. 27 …”

MIMO UV NLOS Communications

“…These limits are governed by the International Commission on Nonionizing Radiation Protection (ICNIRP) [8] and the International Electro-technical Commission (IEC) . Radiation safety limits now in effect for free-space laser transmission are 0.1 microwatt/cm 2 for continuous exposure, and 0.5 microwatt/cm 2 for 6-hour exposure.…”

“…Later, multiple access interference in a NLOS UV sensor network was studied [24]. Chen et al further evaluated LED based UV communication links experimentally [8], [9]. Xu et al…”

“…The model was further extended to accommodate multiple scattering events for sensor network and communication channel modeling [8], [11], [24], similar to backscattering LIDAR [18]. Ding et al proposed a parametric single scattering channel model for both impulse response and path loss [10].…”