Abstract
Visible Light Communications (VLC) can provide both illumination and communications and offers a means to alleviate the predicted spectrum crunch for radio-frequency wireless communications. In this paper, we report a laser diode based white-light communications link that operates over a wide area and supports high data rates. The proposed system is a four-colour multiplexed high-speed VLC system that uses a microelectromechanical system (MEMS) mirror-based beam-steering. The system operates at record data-rates of more than 35 Gb/s (Bit Error Rate(BER) < 3.8 × 10−3) with a coverage area of 39 m2 at a link distance of 4 m. To the best of our knowledge this is the fastest VLC demonstration reported thus far. The paper also addresses issues of eye-safety, showing data rates of more than 10 Gb/s are feasible.
Highlights
Generation communication technology is expected to bring orders of magnitude enhancement in data-rate compared with existing wireless communications[1,2]
In this paper we focus on the high capacity hot-spot design and report a four-colour white-light beam-steered optical link capable of providing such an ultra-high capacity link
A wide coverage visible light communication system with the maximum data-rate of 35 Gb/s was proposed and demonstrated. This can be potentially used for the 5th generation communication system in indoor scenarios where a peak data-rate of >10 Gb/s is required
Summary
Generation communication technology is expected to bring orders of magnitude enhancement in data-rate compared with existing wireless communications[1,2]. Reference[12,13] presented WDM with the use of RGB laser diodes (LD) demonstrating the rate of 8 Gb/s and 14 Gb/s, respectively These high-speed systems provide only fixed point to point communication links. Most of the reported high speed visible-light systems though have shown fixed point-to-point links with limited coverage They used a simple direct modulation and detection and relatively cheap silicon receiver, achieving the maximum reported data-rate of ~10 Gb/s. Most of the IR beam-steering systems reported higher data-rate (~100 Gb/s) using relatively complex methods such as high bandwidth external modulation, polarisation control and high sensitivity InGaAs receivers often with optical amplifiers. The use of steerable mirror and visible wavelength beams can be an alternative to the IR systems It supports 5 G (eMBB: enhanced Mobile Broad Band)’s target peak data-rate of 10 s of Gb/s, and the requirement for VR. The beam-steered visible wavelength system can still take advantage of the special features mentioned above, as opposed to its invisible counterpart
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