High-speed MDM-Ro-FSO system by incorporating spiral-phased Hermite Gaussian modes

Abstract

In the wake of growing challenges of dispersing communication services in rural areas, Radio over Free Space (Ro-FSO) is a useful technology that can carry heterogeneous services. This work focuses on transmitting two independent channels, each carrying 2.5Gbps data and 10GHz radio signal, by utilizing mode division multiplexing (MDM) of two spiral phased Hermite Gaussian modes (HG00 and HG01) free space optical (FSO) link. It also evaluates the performance of the proposed Ro-FSO system under the impact of beam divergence and various atmospheric turbulences such as moderate fog and heavy fog.

Radio-over-free space optical space division multiplexing system using 3-core photonic crystal fiber mode group multiplexers

“…In [41], three 40 GHz signals are optically modulated at 20 Gbps and transported over a 50km-long FSO link in a OFDM-SDM system using three HG modes, HG 00, HG 01 and HG 02. [28] reported on the design of two spiral-phased HG modes for transmission of 2.5Gbps 10GHz radio signals each in a Ro-FSO system under the impact of beam divergence and atmospheric turbulence. In [42], a mode filtering technique using a single mode fiber was experimentally and theoretically shown to mitigate modal effects of a radio-over-fiber-FSO system and improved the system bandwidth by 2 GHz.…”

“…Space division multiplexing (SDM) is a recent spatial diversity strategy transpired by utilizing different eigenmodes in optical fiber as independent channels to create multiple-input-multiple-output systems [22][23][24][25][26][27]. SDM enables the provision of multiple links during harsh weather conditions in case of failure of any of the links and increases the achievable link distance [28][29][30][31][32][33][34].…”

A Cost-Efficient RGB Laser-Based Visible Light Communication System by Incorporating Hybrid Wavelength and Polarization Division Multiplexing Schemes

“…Recently in 2020 [24], authors have demonstrated the transmission of 1.2 Gbps and 1.12 Gbps of data over a 3 and 4 m free space link by using dual polarized green and blue LED-based light streams. On the other hand, hybrid multiplexing schemes are used by many researchers to increase the bandwidth and capacity of optical communication systems [25][26][27][28][29][30][31][32][33][34][35]. In this work, the OOK modulation technique is used for realization of a low-cost VLC system.…”

Performance Investigation of a High Data Rate Mode Division Multiplexed-Free Space Optics Link Under Harsh Weather Conditions

“…Zabih et al reported that the FSO link performance can be improved by increasing the launched optical power and selecting adequate line speed under sandstorm conditions [12]. The current research in RoFSO is mainly focused on fog-and smoke-induced attenuation [13][14][15][16]. Intensive investigation and modeling of the dust effects on the RoFSO channel are yet to grab the attention of researchers.…”