Misalignment loss of Free Space Optic link

Vitasek, Jan; Leitgeb, Erich; David, Tomas; Látal, Jan; Hejduk, Stanislav

doi:10.1109/icton.2014.6876494

Cited by 21 publications

(4 citation statements)

References 4 publications

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“…Free space optical (FSO) communications can establish point-to-point communication links through the atmosphere. Due to unregulated bandwidth, it can offer high security and speed, and relatively low cost and power consumption 1 , 2 . Compared to optical fiber and cable communication, FSO can be easily installed, cost-effective, and can support more users 3 , 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Due to unregulated bandwidth, it can offer high security and speed, and relatively low cost and power consumption. 1,2 Compared to optical fiber and cable communication, FSO can be easily installed, cost-effective, and can support more users. 3,4 However, the reliability of FSO links will still be seriously affected in practical applications even in a clear sky.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of adaptive transmission based on power control over atmosphere composite channel

et al. 2023

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.In free space optical (FSO) communications systems, the signal fading caused by atmospheric turbulence is a slow fading, so adaptive transmission technology can effectively mitigate the problem of channel fading. Considering the combined effects of turbulence, attenuation, and pointing errors on the atmospheric transmission of laser signals, we proposed an adaptive M-ary phase shift keying subcarrier modulation algorithm based on power control and studied the combined adaptation of modulation size and average transmit power. Karush-Kuhn-Tucker conditions are used to solve the optimization problem of maximizing the throughput under the constraint of average transmit power, the expressions of throughput and outage probability are derived based on Meijer G-function. We finally evaluated the effects of turbulence intensity, beam waist radius, jitter standard deviation, weather conditions, and maximum modulation order on the throughput and outage probability of adaptive system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance analysis of adaptive transmission based on power control over atmosphere composite channel

et al. 2023

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“…In [3], the atmospheric turbulence and its effect on laser beam have been studied by the OptiSystem software. In [4], the misalignment loss of FSO communication link has been investigated. In [5], the bit error rate (BER) performance of an OOK modulation system, which is based on Gamma-Gamma model under the combined effects of atmospheric turbulence and pointing error, has been discussed.…”

Section: Introductionmentioning

confidence: 99%

Average Ber Analysis of Free-Space Optical Communications With Adaptive Threshold Technique Over Exponentiated Weibull Distribution

Zhang¹,

Wang²,

Huang³

et al. 2021

PIER Letters

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Average bit error rate (BER) performance of on-off keying (OOK) modulation in a free space optical (FSO) system, which is based on adaptive threshold technique under atmospheric turbulence described by exponentiated Weibull (EW) distribution, is studied and compared with that of using fixed threshold technique. In order to solve the adaptive threshold, the equation is simplified by using the generalized Gauss-Laguerre polynomial function, which significantly improves the operational efficiency. The simulation results show that the adaptive threshold varies with the average transmitted power under different noise variances, receiving aperture sizes and turbulence conditions. Compared with the fixed threshold technique, the adaptive threshold technique can greatly improve the BER performance of FSO communication system.

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“…[4][5][6][7][8][9] FSO terminal is rigidly attached to some stiff and sturdy structure enough to avoid vibration due to weather or traffic, even though the installation requires labor and time. [10][11][12][13][14] Another drawback of conventional FSO is vulnerability to disturbance to aerial laser transmission. Transmission is interrupted in the moment when any obstacle happens to interfere a line-of-sight of the laser beam.…”

Section: Introductionmentioning

confidence: 99%

Initial alignment method for free space optics laser beam

Shimada

Tashiro

Izumi

et al. 2016

Jpn. J. Appl. Phys.

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The authors have newly proposed and constructed an active free space optics transmission system. It is equipped with a motor driven laser emitting mechanism and positioning photodiodes, and it transmits a collimated thin laser beam and accurately steers the laser beam direction. It is necessary to introduce the laser beam within sensible range of the receiver in advance of laser beam tracking control. This paper studies an estimation method of laser reaching point for initial laser beam alignment. Distributed photodiodes detect laser luminescence at respective position, and the optical axis of laser beam is analytically presumed based on the Gaussian beam optics. Computer simulation evaluates the accuracy of the proposed estimation methods, and results disclose that the methods help us to guide the laser beam to a distant receiver.

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Misalignment loss of Free Space Optic link

Cited by 21 publications

References 4 publications

Performance analysis of adaptive transmission based on power control over atmosphere composite channel

Performance analysis of adaptive transmission based on power control over atmosphere composite channel

Average Ber Analysis of Free-Space Optical Communications With Adaptive Threshold Technique Over Exponentiated Weibull Distribution

Initial alignment method for free space optics laser beam

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