LED Based Wavelength Division Multiplexed 10 Gb/s Visible Light Communications

Abstract

LED based Visible Light Communications can provide high data rates to users. This can be further increased by the use of wavelength division multiplexing, using the different colours required to generate white light to transmit different data streams. In this paper a trichromatic approach is described, and the influence of colour combination on achievable data rate is analysed. A demonstration of LED based communications which achieves a data rate of >10 Gb/s by using a rate adaptive orthogonal-frequency-division-multiplexing scheme is also reported.

Reproducing Single-Carrier Digital Modulation Schemes for VLC by Controlling the First Switching Harmonic of the DC–DC Power Converter Output Voltage Ripple

“…Basically, there are two possible approaches. The first one is referred as Wavelength Division Multiplexing (WDM) and considers each HB-LED as an independent transmitter, thus achieving three channels with a bandwidth of around 20 MHz for each one [20]- [25]. The second approach is known as Color-Shift Keying (CSK) and is a modulation scheme that transmits data by performing small variations of the light color [26]- [28].…”

“…The key point is that considering the use of the same bandwidth enhance techniques for both pulse-based and efficient modulation schemes, the last ones achieve higher bit rates. The combination of efficient modulation schemes and different techniques for enhancing the available bandwidth can be found in [21]- [25] and [42]- [45].…”

“…4(b)]. The use of this kind of HB-LED driver for VLC is reported in [7], [13], [21]- [25] and [42]- [45]. The problem is that both HB-LED drivers jeopardize one of the main advantages of HB-LED lighting: the high power efficiency.…”

Spatial and wavelength division multiplexing for high-speed VLC systems: An overview

“…With a non-linear LED response compensation using a Volterra based equalizer, Wang et al demonstrated 4.5 Gb/s system using an RGB LEDs [45] and 8 Gb/s using an RGBY LEDs [6]. Chun et al studied the impact of the different color combination on the communication system and theoretically established an achievable data rate for different RGB color combinations [5]. A > 10 Gbits/s WDM VLC system was demonstrated by using the simultaneous reception of the entire channels.…”

“…Besides optical filtering, a number of advanced and computationally complex techniques had been devised to overcome the bandwidth limitation. As a result, the achievable data rate grew from a humble 100's of Mb/s in 2007 [3], [4] to 10's of Gb/s in 2016 [5]- [7]. In order to make the Gb/s data rate feasible with a low bandwidth system, a number of advanced and computationally complex technologies have been adopted.…”