2×2-channel mode-wavelength division multiplexing in Ro-FSO system with PCF mode group demultiplexers and equalizers

Amphawan, Angela; Chaudhary, Sushank; Ghassemlooy, Zabih; Neo, Tse Kian

doi:10.1016/j.optcom.2020.125539

Cited by 38 publications

(12 citation statements)

References 20 publications

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“…The overall channel capacity was maximized by selecting optimal OAM mode numbers at each value of the SNR and turbulence strength. Spatial mode diversity has also been demonstrated using photonic crystal fibers [45][46][47][48]. Another approach for spatial mode diversity was demonstrated using Hermite-Gaussian (HG) and Laguerre-Gaussian (LG) modes of identical size [39].…”

Section: Free Space Optics For Post-flood Recovery Communicationsmentioning

confidence: 99%

Post-Flood UAV-Based Free Space Optics Recovery Communications with Spatial Mode Diversity

et al. 2022

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The deployment of unmanned aerial vehicles (UAVs) for free space optical communications is an attractive solution for forwarding the vital health information of victims from a flood-stricken area to neighboring ground base stations during rescue operations. A critical challenge to this is maintaining an acceptable signal quality between the ground base station and UAV-based free space optics relay. This is largely unattainable due to rapid UAV propeller and body movements, which result in fluctuations in the beam alignment and frequent link failures. To address this issue, linearly polarized Laguerre–Gaussian modes were leveraged for spatial mode diversity to prevent link failures over a 400 m link. Spatial mode diversity successfully improved the bit error rate by 38% to 55%. This was due to a 10% to 19% increase in the predominant mode power from spatial mode diversity. The time-varying channel matrix indicated the presence of nonlinear deterministic chaos. This opens up new possibilities for research on state-space reconstruction of the channel matrix.

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Section: Free Space Optics For Post-flood Recovery Communicationsmentioning

confidence: 99%

Post-Flood UAV-Based Free Space Optics Recovery Communications with Spatial Mode Diversity

et al. 2022

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“…In [54], a multiplexing coupler is designed using a five-core microstructure optical fiber to demultiplex LP 11 , LP 21 , LP 02 and LP 01 modes simultaneously at 1550nm. In [55], a dual-core PCF mode demultiplexer was designed for mode generation and equalization.…”

Section: A U T H O R Accepted Manuscriptmentioning

confidence: 99%

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

Amphawan

Chaudhary²,

Neo

et al. 2020

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“…RoFSO technology provides unlicensed spectrum operation, interference, and interception-free transmission within a short deployment period and little expense [1]. To enhance the spectral efficiency and information-carrying capacity of RoFSO links, the mode division multiplexing (MDM) technique is incorporated in which independent RF signals are transmitted over distinct spatial modes of a single frequency laser beam [2][3][4][5][6]. Recently, Satea et al proposed that FSO systems employing multiple channels with erbium-doped fiber amplifiers (EDFAs) work efficiently under high attenuation environments such as heavy fog and dust [7].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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The requirement of high data rate information transmission is rising exponentially for supporting different services including social networking, web streaming, and biomedical sensor data transmission. Such services required high channel bandwidth with secure information transmission and immunity to electromagnetic interference. Radio over free space optics (RoFSO) is witnessed as a promising technological solution to provide high data rate transmission over free space channel. We report on the design of a 2×10 Gb/s-10 GHz RoFSO transmission system using the mode division multiplexing technique and evaluate its transmission performance over varying levels of dust weather conditions. The comparison of non-return to zero (NRZ) and return to zero (RZ) binary digital optical modulation techniques is carried out in the proposed system. It is found that the proposed system using NRZ modulation serves 14.5 km transmission range; however, in the case of RZ modulation, it was restricted to 10 km for a target bit error rate (BER) of 10−6, thus resulting in a noticeable link enhancement of 4.5 km. Also, we demonstrate NRZ-based MDM-RoFSO link performance and availability in dust weather conditions using the BER, maximum reachable link range, and eye diagram as key performance parameters. We obtain a reliable transmission of 20 Gb/s-20 GHz data through HG00 and HG01 channels over a link range of 2500–108 m depending on the external dust weather condition. Furthermore, since this investigation shows the feasibility of RoFSO for small size cells, which is an essential feature of 5G mobile network, the proposed system can thus be implemented as a backhaul/fronthaul link for high-band (above 6 GHz) 5G services and for providing secure transmission of biomedical sensor data.

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2×2-channel mode-wavelength division multiplexing in Ro-FSO system with PCF mode group demultiplexers and equalizers

Cited by 38 publications

References 20 publications

Post-Flood UAV-Based Free Space Optics Recovery Communications with Spatial Mode Diversity

Post-Flood UAV-Based Free Space Optics Recovery Communications with Spatial Mode Diversity

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

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

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