2 × 10 Gbit/s–10 GHz Radio over Free Space Optics Transmission System Incorporating Mode Division Multiplexing of Hermite Gaussian Modes

Abstract

In this paper, we report the modeling and simulative investigation of a mode division multiplexing (MDM)-based Radio over Free space optics (RoFSO) transmission system. Two separate 10 Gbit/s–10 GHz information signals are transported successfully over 30 km link range using distinct Hermite Gaussian (HG) modes. Also, the decomposition of distinct modes at the receiver terminal has been reported in this work. Furthermore, the impact of different fog conditions and scintillation effect on the performance of the proposed link has also been discussed in this paper.

Impact of Scintillation Effect on Clear Weather and Fog Conditions using MDM-WDM Modulation Technique

“…Some of the wide range of applications includes video surveillance and monitoring, connectivity to a smaller distance, disaster recovery, security, broadcasting, back-haul system, video conferencing, online demand of bandwidth for gaming and live streaming etc. Increasing demand in data traffic has become a significant part of the total backbone traffic and thus advanced modulation techniques may be employed to enhance the system performance and scalability [6][7][8]. System with single beam is susceptible to diverse weathers including fog, rain, haze, snow and atmospheric turbulences.…”

Performance analysis of coherent free‐space optics transmission link using in‐phase quadrature modulator‐based polarization multiplexed‐256‐quadrature amplitude modulation

“…Recently, the application of space division multiplexing (SDM) in FSO links to transmit multiple data streams over distinct spatial laser modes of a single‐beam laser to increase information rate of the link has been gaining significant interest 13,14 . Singh et al proposed a high‐capacity long‐reach SDM‐based radio on FSO transmission link and compared the performance of differential phase‐shift keying (DPSK) and different on‐off shift keying schemes under the impact of increasing information rates and atmospheric turbulence conditions 15 .…”

“…The authors reported feasible transportation of 10 independent 10 Gbit/s NRZ‐encoded data signals over 8 km free‐space range with acceptable BER of the link. The incorporation of SDM in FSO links as reported in References 13‐20 increase the information rate of the system, but the intermodal crosstalk losses under turbulent weather conditions reduce the feasibility and transmission reach of such links.…”

“…The IQM‐based coherent transceiver and DSP units can practically be implemented on integrated circuits, making the proposed system a cost‐effective FSO solution 34 . Using the proposed link, 160 Gbit/s information is transmitted at 10 Gbaud symbol rate over a single‐frequency optical carrier signal, which is more spectral‐efficient in comparison to recent works reported in References 2‐20. Section 2 describes the schematic and principle of PM‐256‐QAM‐based FSO link.…”

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

“…These merits of FSO transmission systems makes it a front-runner technology for future large-bandwidth wireless networks. The transmission of mmWave over FSO systems, also referred to as Radio-on-Free Space Optics (Ro-FSO) transmission is regarded as a crucial and significant technological solution for practical implementation of 5G services in both rural and urban areas (Singh and Malhotra, 2019a;Singh et al, 2021b;Singh and Malhotra, 2020a;Singh and Malhotra, 2019b;Singh and Malhotra, 2020b). Apart from secure transmission of mmWave over free-space medium, Ro-FSO system provide additional low-latency networks and high availability.…”