Experimental Investigation of All-Optical Relay-Assisted 10 Gb/s FSO Link Over the Atmospheric Turbulence Channel

Nor, Norhanis Aida Mohd; Ghassemlooy, Zabih; Bohata, Jan; Saxena, Prakriti; Komanec, Matěj; Zvánovec, Stanislav; Bhatnagar, Manav R.; Khalighi, Mohammad-Ali

doi:10.1109/jlt.2016.2629081

Cited by 84 publications

(35 citation statements)

References 32 publications

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“…Finally, we carried out further analyses for the FSO path of 500 m long, which is the typical range for the last-mile access network in the urban areas [32]. Fig.…”

Section: Evm Resultsmentioning

confidence: 99%

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Al-Musawi

Cseh

Bohata

et al. 2017

J. Lightwave Technol.

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Abstract-This paper demonstrates a hybrid radio over multimode fibre and free space optics (RoMMF-FSO) system that can be used to extend the transmission range of the 4 th generation longterm evolution (4G-LTE) signal in access networks. A single mode filtering technique (SMFT) is used to enhance 4G-LTE performance. The proposed scheme is evaluated in terms of the system transfer function, laser beam profile, and error vector magnitude (EVM). We show that using SMFT increases the RoMMF-FSO system bandwidth by 2 GHz and improves the received optical power by 13.6 dB. Moreover, the proposed system enhances the EVM by 4%. The measured results show that using a 1 km MMF instead of a 1 km SMF will marginally increase the measured EVM from ~6.6% to ~7% with a 0.2 dB power penalty with respect to the LTE EVM limit of 12.5% as is specified for 16-quadrature amplitude modulation. The proposed system is validated practically under atmospheric turbulence conditions to mimic the outdoor environment. Measured EVM results are verified theoretically through transmitting LTE signals with turbulent using log-normal model. We also show that for a FSO link span of 500 m to meet the EVM target of 12.5% the SNR power penalties are ~2 dB and ~11 dB for σ R 2 of 1.2×10 -4 and 0.1, respectively compared with no turbulence.Index Terms-Free space optics, long term evolution, multimode optical fibres, radio-over-fibre.

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“…Finally, we carried out further analyses for the FSO path of 500 m long, which is the typical range for the last-mile access network in the urban areas [32]. Fig.…”

Section: Evm Resultsmentioning

confidence: 99%

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Al-Musawi

Cseh

Bohata

et al. 2017

J. Lightwave Technol.

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“…In particular, the impact of fog was investigated via simulation methods in a controlled environment using a theater smoke machine [17]. A controlled fog environment with different modulation schemes, relaying-assisted system, various atmospheric turbulence regimes, and link budget based on quantify the geometrical loss were utilized and evaluated in [18][19][20][21]. In a similar way, the work in [22] focused on the effect of sandstorms in desert areas using a chamber that pumps different kinds of dust across the FSO beam.…”

Section: Related Workmentioning

confidence: 99%

Free-space optical channel characterization and experimental validation in a coastal environment

et al. 2018

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Over the years, free-space optical (FSO) communication has attracted considerable research interest owing to its high transmission rates via the unbounded and unlicensed bandwidths. Nevertheless, various weather conditions lead to significant deterioration of the FSO link capabilities. In this context, we report on the modelling of the channel attenuation coefficient (β) for a coastal environment and related ambient, considering the effect of coastal air temperature (T), relative humidity (RH) and dew point (TD) by employing a mobile FSO communication system capable of achieving a transmission rate of 1 Gbps at an outdoor distance of 70 m for optical beam wavelengths of 1310 nm and 1550 nm. For further validation of the proposed models, an indoor measurement over a 1.5 m distance utilizing 1310 nm, 1550 nm, and 1064 nm lasers was also performed. The first model provides a general link between T and β, while the second model provides a relation between β, RH as well as TD. By validating our attenuation coefficient model with actual outdoor and indoor experiments, we obtained a scaling parameter x and decaying parameter c values of 19.94, 40.02, 45.82 and 0.03015, 0.04096, 0.0428 for wavelengths of 1550, 1310, 1064 nm, respectively. The proposed models are well validated over the large variation of temperature and humidity over the FSO link in a coastal region and emulated indoor environment.

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“…erefore, FSO communications become viable due to its low implementation cost from one side and to overcome RF spectrum scarcity on the other side. However, the performance of FSO systems can be degraded due to rain, mist, tide, warm, or pointing errors [1][2][3][4][5][6][7][8][9][10]. To circumvent this drawback, we can use cooperative or spatial diversity combined with error control coding [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Optimal Packet Length for Free-Space Optical Communications with Average SNR Feedback Channel

Alnwaimi

Boujemâa

Arshad

2019

Journal of Computer Networks and Communications

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In this article, a method to enhance data rates of free-space optical (FSO) systems using packet length optimization is proposed. The average signal-to-noise ratio (ASNR) is measured at the receiver and sent back to the transmitter to optimize packet length. In addition, the length of packet is optimized to enhance the average throughput. We concluded that packet length can be reduced at low ASNR. However, packet length should be increased at higher values of received ASNR. For each ASNR, we also choose the optimal modulation and coding scheme (MCS) and optimal packet length to maximize the throughput. Different MCSs are investigated such as 4-pulse amplitude modulation (PAM) with and without channel coding, 8-PAM, 16-PAM, and 32-PAM. The proposed method gives 0.8–1.9 dB gain with respect to conventional FSO with adaptive modulation and coding (AMC) and fixed packet length. This is the first paper to deal with packet length optimization for FSO systems.

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Experimental Investigation of All-Optical Relay-Assisted 10 Gb/s FSO Link Over the Atmospheric Turbulence Channel

Cited by 84 publications

References 32 publications

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Free-space optical channel characterization and experimental validation in a coastal environment

Optimal Packet Length for Free-Space Optical Communications with Average SNR Feedback Channel

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