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Abstract
We discuss an optical ray-tracing approach to minimizing path-loss in a variable link length indoor blue laser down-converted white light visible light communication (VLC) system. For a given link length, minimum path-loss is achieved by finding optimum positions of transmitter and receiver lenses relative to phosphor and detector respectively such that collection efficiency is maximized. The designed VLC system is experimentally implemented for two different optimized link lengths of 25 and 300 cm. The down-converted white light for the optimized link is found to exhibits narrow beam spread, spot-lighting type illumination profile. The white light is measured to quantify the beam profile, color rendering, illuminance and percentage of blue-content. The illumination beam profile and propagation characteristics are found to be in good agreement with optical simulations. Communication experiments with on-off modulated at 1.5 Gbps achieved BER of ~3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> for the optimized link, which is below the forward-error correction threshold. The above communication performance is achieved at illumination levels at the receiver as low as ~45 and 16 lx. Comparison with previous laser-based VLC implementations shows that the path-loss optimization helps achieve gigabit-class communication at practically relevant link lengths and the lowest illuminance levels thus far reported. Such low illuminance level, narrow beam spread VLC luminaires can potentially coexist with existing lighting infrastructure for eye-safe indoor applications.
Highlights
Visible light communication (VLC) offers a promising solution to meet the need for high data-rate communication in indoor settings by leveraging solid-state lighting installations for short range free-space optical communication [1], [2]
Experimental characterization of the visible light communication (VLC) link to measure the white light illumination quality and data communication performance are discussed. These measurements are performed with the VLC link optimized for L = 25 and 300 cm by precisely measuring the distance between the transmitter lens and phosphor to within 0.5 mm accuracy
We have demonstrated an optical ray-tracing based approach for minimizing path-loss for indoor laser-based visible light communication system
Summary
Visible light communication (VLC) offers a promising solution to meet the need for high data-rate communication in indoor settings by leveraging solid-state lighting installations for short range free-space optical communication [1], [2] This is motivated by the large, un-licensed bandwidth available in the optical spectrum, the inherent small-cell architecture of illumination light sources and the absence of RF interference with the use of optical waves [2]. The inherent low modulation bandwidth of LEDs increases the complexity of the electronic hardware required to implement high data-rate communication utilizing advanced modulation formats This bandwidth limitation with LEDs is overcome to some extent with the use of emerging micro- and resonant-LED based transmitters [7], [8]. Aggregated data rate as high as 14 Gbps has been demonstrated with such RGB LDs using 16-QAM OFDM for a link range of 30 cm [12]
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