Optimization of free space optics parameters: An optimum solution for bad weather conditions

Fadhil, Hilal A.; Amphawan, Angela; Shamsuddin, Hasrul A.B.; Hussein, Thanaa; Al-Khafaji, Hamza M. R.; Aljunid, S. A.; Ahmed, N.

doi:10.1016/j.ijleo.2012.11.059

Cited by 179 publications

(74 citation statements)

References 4 publications

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“…The attenuation of the transmitted signal can be obtained from the previous model to various weather conditions using q [1,6,7]: This form of calculation is very handy because for a given wavelength, the amount of the attenuation only depends on the visibility [1]. The visibility is used in the equation above as in [1,4].…”

Section: Dust Storms Attenuation For Fso Linkmentioning

confidence: 99%

“…A new laboratory structure to replicate the sandstorm based on fluid dynamics simulations has been addressed and reported in [4]. The optical amplifying-and-forward (OAF) relaying technique using the optical amplifier was first proposed in [5], and in [6] the problem of beam divergence caused by atmospheric turbulence through the implementation of FSO system over atmosphere for a long distance was avoided by using wave length division multiplexing (WDM) and parameters tuning of FSO link to increase the overall system performance.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of FSO communications links under complex environment

2017

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Free space optical communication is a line-of-sight (LOS) technology that uses lasers to provide optical bandwidth connections. Potential disturbance arising from the weather condition is one of the most effective factors that influence the bi-directional free space optics (FSO) performance. The complex weather condition in the Middle East region and Arabian Gulf has been dominated by dust storms activities. Dust storms directly affect the characteristics of FSO and consequently lead to an increase in the bit error rate (BER) and deterioration Q-factor to bad levels due to the high attenuation factor. In this research, the authors compare the differences between two bi-directional FSOs. One is the traditional link, and the other has been developed to enhance the system performance under the dust storms condition. The proposed design consists of dual FSO channels, and each one includes erbium-doped fiber amplifier (EDFA) optical amplifiers. This design has demonstrated the proficiency in addressing the attenuation that occurs due to weather stickers. The results prove there is an improvement in performance by measuring the Q-factor. In addition, BER can be significantly improved, and further communicating distance can be achieved by utilizing 1550 nm with multiple channels and EDFA.

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Section: Dust Storms Attenuation For Fso Linkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of FSO communications links under complex environment

2017

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“…In 1970, Nippon Electric Company (NEC) of Japan demonstrated the first full duplex FSO link by using 632.8 nm He-Ne laser to compensate the traffic data up to a length of 14 km between the Yokohama and Tamagawa [13]. Several experiments from the last decade further stimulated researchers in the field of FSO [14][15][16][17][18][19][20][21]. The link equation for FSO is given by the following equation [22]:…”

Section: Fso For Terrestrial Communicationmentioning

confidence: 99%

The Role and Challenges of Free-space Optical Systems

Chaudhary¹,

Amphawan²

2014

Journal of Optical Communications

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Abstract:Complementing wireless radio networks with free-space optics (FSO) achieves high data rates by modulating radio subcarriers over an optical carrier without expensive optical fiber cabling, enabling a pervasive platform for reaching underserved areas. In this paper, we review the main features of FSO for terrestrial and inter-satellite communications. Simulations of 1 Gbps data transmission through FSO links in both terrestrial and inter-satellite communications have been investigated to highlight potential atmospheric challenges in FSO.

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“…Attenuation coefficient based on empirical measurement data was calculated by the following empirical model [12] …”

Section: Attenuation By Fogmentioning

confidence: 99%

Comparison of NRZ, RZ-OOK Modulation Formats for FSO Communications under Fog Weather Condition

Ali¹

2014

IJCA

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In this paper, the performance of an FSO wireless communications system is theoretically analyzed, using NRZ, RZ-OOK modulation formats and a Si PIN photodiodes receiver over fog weather conditions. Based on different fog models for optical beam propagation horizontally at 850 nm1550nm on an FSO, the visibility of weather and power of the transmitter under fog weather are analyzed. The characteristics of bit error rate BER for NRZ and RZ-OOK optical modulation formats are studied under different fog models. Simulation results indicate that the performance of 1550nmis more suited for an FSO communication system. On the other hand, we discuss the suitability of fog models under these modulation formats. KeywordsFSO, fog attenuation, visibility, bit error rate BER, NRZ-OOK, RZ-OOK.

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Optimization of free space optics parameters: An optimum solution for bad weather conditions

Cited by 179 publications

References 4 publications

Enhancement of FSO communications links under complex environment

Enhancement of FSO communications links under complex environment

The Role and Challenges of Free-space Optical Systems

Comparison of NRZ, RZ-OOK Modulation Formats for FSO Communications under Fog Weather Condition

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