Feasibility study of free-space optical communication for South Africa

Mohale, Julius; Handura, M.R.; Olwal, Thomas O.; Nyirenda, Clement N.

doi:10.1117/1.oe.55.5.056108

Cited by 20 publications

(15 citation statements)

References 9 publications

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“…In case of optical signal propagation through free space the effect of absorption is negligible due to selective wavelength [1,13,14]. Absorption has a very little effect when the wavelength is in between 780 nm to 1662 nm [15]. Moreover, the wavelength 1550 nm offers some additional advantages [16], hence, the nominated wavelength in this work is 1550 nm.…”

Section: Impacts Of Atmosphere On Fsomentioning

confidence: 99%

“…Mie scattering is applicable when fog and haze droplets exist in the atmosphere. The scattering coefficient is computed by [13,15,17].…”

Section: Scattering Effect On Fsomentioning

confidence: 99%

“…It causes wave front distortion by phase shifting of the propagating optical signal and intensity distortion. But between these two types of distortion, intensity distortion is the most significant and known as scintillation [15]. The effect of atmospheric turbulence becomes mostly indicative in the midday or mid night due to the maximum temperature difference created at these times allthough turbulence effect degrades the optical signal quality throughout whole day.…”

Section: Atmospheric Turbulencementioning

confidence: 99%

“…The effect of atmospheric turbulence becomes mostly indicative in the midday or mid night due to the maximum temperature difference created at these times allthough turbulence effect degrades the optical signal quality throughout whole day. The atmospheric turbulence loss caused by scintillation is proposed by Rytov and recommended by ITU is given as follows [15]: Here, is the optical wave number, is the link length in km and 2 is the refractive index structure parameter (RISP) in m −2/3 . The typical value of RISP 2 is 1.3 for planer wave and 0.5 for spherical wave [18].…”

Section: Atmospheric Turbulencementioning

confidence: 99%

“…Basically it depends on the geographical location (altitude above sea level) and wind speed. A common and widely used model to determine this is Hufnagel-Valley (H-V) model [13,14,15].…”

Section: Atmospheric Turbulencementioning

confidence: 99%

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Terrestrial free space optical communications in Bangladesh: transmission channel characterization

Shahiduzzaman

Haider

Karmaker

2019

IJECE

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This research work focused on transmission channel characterization of Free-Space-Optical (FSO) communications technology for deploying in the developing country like Bangladesh. To meet the tremendous amount of data traffic, mobile operators and ISPs need better solution than the existing RF and fiber optic communications. Moreover, Bangladesh is entering in the era of satellite communications by launching its own satellite. So, Bangladesh needs such communication technology that provides higher channel bandwidth, sophisticated transmission security and can cope channel dispersion. FSO is a good candidate that can meet all these features. The transmission channel characterization plays a significant role in optimizing the performance of FSO link. In this work, the channel characterization of FSO technology from the weather perspective of Bangladesh has been investigated thoroughly. The obtained results show that the atmospheric scattering effect does not hamper the short range FSO link performance, whereas, the atmospheric turbulence effect is not favorable to deploy FSO technology with reasonable quality signal unless it is optimized properly using antenna aperture averaging technique.

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Section: Impacts Of Atmosphere On Fsomentioning

confidence: 99%

“…Mie scattering is applicable when fog and haze droplets exist in the atmosphere. The scattering coefficient is computed by [13,15,17].…”

Section: Scattering Effect On Fsomentioning

confidence: 99%

Section: Atmospheric Turbulencementioning

confidence: 99%

Section: Atmospheric Turbulencementioning

confidence: 99%

“…Basically it depends on the geographical location (altitude above sea level) and wind speed. A common and widely used model to determine this is Hufnagel-Valley (H-V) model [13,14,15].…”

Section: Atmospheric Turbulencementioning

confidence: 99%

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Terrestrial free space optical communications in Bangladesh: transmission channel characterization

Shahiduzzaman

Haider

Karmaker

2019

IJECE

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Free space optical system design using particle swarm optimization

Malik

Sahu

2020

Int J Communication

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SummaryThe performance of the free‐space optical (FSO) communication system is severely affected by atmospheric properties and misalignment between transmitter‐receiver sections. These effects can be minimized by selecting the precise and proper value of operating parameters. The divergence angle can play a key role in mitigating the negative impact of deviation of an optical beam from its fundamental direction due to different adverse influences. In this paper, we have presented a particle swarm optimization model for determining the optimum divergence angle for designing an optimal FSO link. The FSO transreception quality depends on the medium properties which have a number of detrimental effects like rain, fog, haze, physical obstruction, scattering, and atmospheric turbulence. The proposed work investigate the optimum divergence angle with respect to the maximum deviation angle under different adverse conditions, as mentioned above. Taking into account these effects, the analytical expression of optical link margin and the optimum divergence angle with respect to the maximum deviation angle is derived. The results are analyzed for finding out the most suitable wavelength of the transmitter, transmitted power, link margin, and the link budget under different adverse conditions for reliable communication.

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Performance analysis of free space optical communication system under rain weather conditions: a case study for inland and coastal locations of India

Singh

Mittal

2021

Opt Quant Electron

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This work aims to investigate the performance of Free Space Optical Communication link under average and worst rain weather conditions of India. The meteorological data related to rainfall, from 2014 to 2017, was obtained from the Indian Meteorological Department for six different locations of India, representing the inland and coastal areas. The attenuation coe cient due to rain for all the locations has been calculated using mathematical models. The performance analysis of Wavelength Division Multiplexing based Free Space Optical Communication system has been analyzed, by incorporating the attenuation due to rain for all considered locations, in terms of received power, signal to noise ratio, bit error rate and eye diagrams. The inland location of Hyderabad has given the best results in terms of above mentioned parameters as it has recorded minimum average rainfall of 2.35 mm/hr with minimum attenuation coe cient of 1.91 dB/km and can support a link range of 5.43 km, corresponding to bit error rate of order of 10 -9 under average rain weather conditions. On the other hand, the average rainfall is maximum for the coastal area of Mumbai with a value of 7.31 mm/hr, resulting in maximum attenuation coe cient of 4.08 dB/km and the maximum link range is limited to 3.48 km, corresponding to bit error rate of order of 10 -9 under average conditions of rain weather. Similarly, the inland locations of India have delivered a better link performance as compared to coastal areas under worst rain weather conditions also. So it has been concluded that the coastal areas of India have shown major degradation in the performance of the FSOC link as compared to inland locations of the country.

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Feasibility study of free-space optical communication for South Africa

Cited by 20 publications

References 9 publications

Terrestrial free space optical communications in Bangladesh: transmission channel characterization

Terrestrial free space optical communications in Bangladesh: transmission channel characterization

Free space optical system design using particle swarm optimization

Performance analysis of free space optical communication system under rain weather conditions: a case study for inland and coastal locations of India

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