Experimental verification of an all-optical dual-hop 10  Gbit/s free-space optics link under turbulence regimes

Abstract

This Letter presents original measurement results from an all-optical 10 Gbit/s free-space optics (FSO) relay link involving two FSO links and an all-optical switch. Considering the fact that reported analyses of relay links are dominated by analytical findings, the experimental results represent a vital resource for evaluating the performance of relay FSO links in the presence of atmospheric turbulence. Bit-error-rate (BER) performance of the relay system is tested for single and dual-hop links under several turbulence regimes. Furthermore, results from this measurement are used to ascertain real parameters of the outdoor links and to improve the accuracy of simulation results. Results show that using a dual-hop FSO link against a single FSO link could result in up to four orders of magnitude improvement in BER in the presence of atmospheric turbulence.

Multi-Hop Relay Based Free Space Optical Communication Link for Delivering Medical Services in Remote Areas

“…All-optical relaying also finds mention in research works of, see [19]- [20] wherein authors have used OptiSystem to design and investigate the performance of multi-hop FSO links over fading channel conditions. Libich et al and Nor et al in their research work, see [23] and [24] respectively, have experimentally proved the practicality of 10 Gbps serial relay FSO transmission over direct links in the presence of turbulent fading conditions. Based on available research findings presented here, we have narrowed down to propose an all-optical amplify and forward (A-F) based multi-hop serial relay FSO link.…”

“…However, it is imperative to understand here that while the accuracy of the lognormal distribution is limited to weak turbulence regimes, K-distribution can characterize severe turbulence conditions only, see [1], [5]. As per experimental and analytical literature, see [23]- [25], Gamma-Gamma distribution can model weak to strong turbulence conditions with significant accuracy. For channels characterized using Gamma-Gamma channel distribution, the probability density function (PDF) of received irradiance I is a function of two independent Gamma distributions f (x) and f (y) which are in turn related to the presence of small and large turbulence eddies, respectively.…”

Free Space Optics (FSO): A Promising Solution to First and Last Mile Connectivity (FLMC) in the Communication Networks

“…So many experimental investigations have supported the concept of FSO connectivity in the communication networks. One of the experiment carried out on 10Gbits/s dual hop FSO setup in atmospheric turbulences for 100 to 500m showed better BER performance and it also suggested the all optical switching overcomes the complexity of optical to electrical conversion [11]. One more investigation on 10Gbps data rate achieved over atmospheric turbulent channel at 10km distance with NRZ, RZ and in the Communication Networks Copyright © 2020 MECS I.J.…”

Optical Wireless and Millimeter Waves for 5G Access Networks

“…FSO deployment rather than fiber offers a cheaper and quicker way of providing customer bandwidth, and may also be employed in disaster scenarios [22]. Substantial research efforts to improve FSO system performance in adverse atmospheric conditions mean that multi-gigabit rates are possible in the presence of turbulence [23].…”