Performance of free space optical links in presence of turbulence, pointing errors and adverse weather conditions

AbstractIntersymbol interference and attenuation of signal are two major parameters affecting the quality of transmission in Free Space Optical (FSO) Communication link. In this paper, the impact of these parameters on FSO communication link is analysed for delivering high-quality data transmission. The performance of the link is investigated under the influence of amplifier in the link. The performance parameters of the link like minimum bit error rate, received signal power and Quality factor are examined by employing erbium-doped fibre amplifier in the link. The effects of amplifier are visualized with the amount of received power. Further, the link is simulated for moderate weather conditions at various attenuation levels on transmitted signal. Finally, the designed link is analysed in adverse weather conditions by using high-power laser source for optimum performance.

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Effect of adverse weather conditions and pointing error on the performance of 2-D WH/TS OCDMA over FSO link

Journal of Optical Communications ◽

10.1515/joc-2020-0127 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Bithi Mitra ◽

Md. Jahedul Islam

Keyword(s):

Free Space ◽

Atmospheric Condition ◽

Optical Power ◽

Weather Conditions ◽

Free Space Optical ◽

Central Wavelength ◽

Pointing Error ◽

Adverse Weather ◽

Code Division Multiple ◽

Ber Performance

AbstractIn this paper, the performance of two-dimensional (2-D) wavelength-hopping/time-spreading (WH/TS) optical code division multiple access (OCDMA) system over free space optical (FSO) channel is analyzed in the presence of pointing error and different weather conditions. Prime code scheme is employed for both wavelength-hopping and time-spreading to address user code-matrix. The operating central wavelength of 1550 nm is considered to demonstrate the bit error rate (BER) performance of the proposed system as a function of various system parameters. The required optical power of the proposed system is determined to maintain a BER value of 10−9. The numerical evaluation interprets that the BER performance is highly dependent on transmission length, transmitted power, pointing error angle as well as the number of simultaneous user. It is also observed that the 2-D OCDMA system over free space needs minimum required optical power in case of rainy atmospheric condition, but it is maximum for foggy atmospheric condition.

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Novel results on pulse-position modulation performance for terrestrial free-space optical links impaired by turbulent atmosphere and pointing errors

IET Communications ◽

10.1049/iet-com.2011.0545 ◽

2012 ◽

Vol 6 (10) ◽

pp. 1300 ◽

Cited By ~ 23

Author(s):

W. Gappmair

Keyword(s):

Free Space ◽

Turbulent Atmosphere ◽

Pulse Position Modulation ◽

Free Space Optical ◽

Optical Links ◽

Pointing Errors

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Performance Analysis of FSO Links in Turbulent Atmosphere

Advances in Wireless Technologies and Telecommunication - Design, Implementation, and Analysis of Next Generation Optical Networks ◽

10.4018/978-1-5225-9767-4.ch004 ◽

2020 ◽

pp. 100-156

Author(s):

Banibrata Bag ◽

Akinchan Das ◽

Aniruddha Chandra ◽

Rastislav Róka

Keyword(s):

Atmospheric Turbulence ◽

Communication Systems ◽

Weather Conditions ◽

Free Space Optical ◽

Wireless Optical Communication ◽

Adverse Weather Conditions ◽

Adverse Weather ◽

Optical Communication Systems ◽

Active Research ◽

Atmospheric Channel

The free-space optical communications technology is emerging as an attractive substitute to RF communications. It can satisfy the current demands for higher bandwidth to the customer. Atmospheric turbulence is a major obstacle in wireless optical communication systems. To fully utilize the terabit capacity of FSO system, it has to overcome various challenges offered by the heterogeneous nature of the atmospheric channel. Currently, FSO communication through atmospheric turbulence under adverse weather conditions is an active research topic. A lot of studies and experiments have been carried out on the effect of attenuation due to atmospheric turbulence; but still, much more research is necessary for fulfilling the current demands and commercial needs for implementing this technology successfully. This chapter discussed the various limitations of FSO system which are faced during data transmission through the atmospheric channel and various ways to improve the performance regarding BER, outage probability, and channel capacity.

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