Demonstration of a Hybrid FSO/VLC Link for the Last Mile and Last Meter Networks

Pesek, Petr, Zvanovec, Stanislav, Chvojka, Petr, Ghassemlooy, Zabih and Haigh, Paul Anthony (2019) Demonstration of a Hybrid FSO/VLC Link for the Last Mile and Last Meter Networks. IEEE Photonics Journal, 11 (1). p. 7900307. ISSN 1943-0647

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Abstract

In this paper, a hybrid free-space optical and visible light communication (FSO/VLC) system was experimentally demonstrated as a solution to overcome the last mile and last meter access networks bandwidth bottleneck. We evaluate the system performance of a multiband carrier-less amplitude and phase ( $\textit{m}$ -CAP) modulation scheme for a range of FSO/VLC link lengths and $\textit{m}$ -CAP parameters (i.e., the roll-off factor of the filters and a number of subcarriers) in terms of the data rate $R_b$ (i.e., spectral efficiency). We show that for the configuration with a 1 m VLC link the \mbox{10-CAP} offers more than a 40% improvement in the measured $R_b$ compared to 2-CAP for the same bit error rate target. The $R_b$ penalty due to the extension of a VLC link span from 1 m to 3 m reaches to 12.6 Mb/s for the $\mbox{10-\text{CAP}}$ scheme (i.e., $\sim$ 39% degradation in $R_b$ ). To fully cover all aspects of the hybrid FSO/VLC system, we also investigate the atmospheric turbulence effect on the 500 m FSO link where $R_b$ is decreased by 30% for the refractive index structure parameter $C_n^2$ of $\mbox{2.4$ \times.

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