Design, Simulation and Testing of the OOK NRZ Modulation Format for Free Space Optic Communication in a Simulation Box

Vanderka, Aleš; Hajek, Lukas; Látal, Jan; Vitasek, Jan; Koudelka, Petr

doi:10.15598/aeee.v12i6.1255

Cited by 21 publications

(17 citation statements)

References 15 publications

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“…Random beam deflections lead to an increase in bit error rate or even to a complete loss of signal [1][2][3][4][5][6]. Turbulence in the atmosphere are very unstable pockets of different sizes and densities unstable in time, continuously forming, changing and disappearing.…”

Section: $Wprvskhulf Wxuexohqfhmentioning

confidence: 99%

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Numerical models and experiment of air flow in a simulation box for optical wireless communications

Látal

Hajek

Bojko

et al. 2016

EPJ Web of Conferences

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Abstract. In this article, the authors focused on real measurements of mechanical turbulence generated by ventilators in the simulation box for Optical Wireless Communications. The mechanical turbulences disturb the optical beam that propagates along the central axis of the simulation box. The aim of authors is to show the effect of mechanical turbulence on optical beams at different heights in the simulation box. In the Ansys Fluent, we created numerical models which were then compared with real measurements. Authors compared the real and numerical models according to statistical methods.

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Section: $Wprvskhulf Wxuexohqfhmentioning

confidence: 99%

“…Another method which is focused on the determination of turbulent attenuation is called the method of available power. It is used for the sources with a Gaussian distribution of the optical intensity in the plane perpendicular to the direction of propagation [1][2][3][4][5][6].…”

Section: The Diameter Of the Beam Is Larger Than The Turbulencementioning

confidence: 99%

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Látal

Hajek

Bojko

et al. 2016

EPJ Web of Conferences

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“…FSO attenuation occurs due to the presence of disturbed atmosphere because atmospheric channel is not ideal [5]. This can probably result in high bit error rates, scattering and absorption of visible and IR optical beams, thus lowering and debasing the FSO system performance.…”

Section: Effect Of Critical Weather Conditions On the Performancmentioning

confidence: 99%

“…Table 1 shows visibility and attenuation coefficient for these critical weather conditions and effect of attenuation for these critical weather conditions have been explained as below: A. Rain Condition: Rainfall rate has a distancediminishing effect on FSO system, this is because the radius of raindrops (200-2000μm) is significantly larger than the wavelength of typical FSO light sources [5]. Usually rain attenuation values are moderate in nature.…”

Section: Effect Of Critical Weather Conditions On the Performancmentioning

confidence: 99%

“…Results showed that in the presence of moderate fog weather condition, 11.85 µrad is the maximum pointing error and -41.09 dBm is achieved for NRZ-APD at 1550 nm in order to maintain BER < 10 -9 . Ales et al [5] dealed with the construction of a modulator and demodulator for FSO system and examines primarily the appropriate modulation format for FSO and also describes the construction of two types of photo detectors. This paper concluded that for OOK NRZ modulation the, maximum transmission speed achieved the value of 160 Mbps.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of 16 × 2.5Gb/s FSO System for the Most Critical Weather Conditions

Kaur¹,

Sheetal²

2015

International Journal of Advanced Research in Computer and Comm

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Free space optics (FSO) uses air as a transmission medium and is significantly affected by the various weather conditions such as haze, rain, fog, snow, wind, etc. In this paper, the behaviour of 16 × 2.5Gb/s FSO system under the effect of the most critical weather conditions using RZ format has been investigated. The operating channel frequencies range from 193.4THz to 189.7THz with the frequency spacing of 100GHz.The performance of the 10 th channel has been considered being the worst case scenario to analyse the system. The FSO system is evaluated by varying attenuation from 4.2850dB/km to 116dB/km under different weather conditions. It has been found that as attenuation increases the performance drastically degrades owing to scattering, absorption, free space path loss, geometric losses and other losses suffered by the FSO system. The faithful transmission distance achieved is 9000m in clear weathers and has reduced to 2000m and 100m in case of heavy rain and dense snow respectively. Further, it is shown that channel 2 operating at 193.16THz, gives best results for the FSO system at 40Gb/s where the highest value of Q factor is 29.16dB and OSNR is 80.060dB and 4.9dB value of OSNR for heavy rain has been achieved thus, dense snow, fog and heavy rain are the worst weather conditions which intensely degrade the performance of FSO system.

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Effect of fog and scintillation on performance of vertical free‐space optical link from Earth to low Earth orbit satellite

Ashraf

Zaghloul

Shaalan

et al. 2020

Satell Commun Network

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Summary This paper studies the effects of fog and scintillation attenuations on the performance of the vertical free‐space optical (FSO) link from the Earth to low Earth orbit (LEO) satellite. FSO link performance was investigated under different foggy conditions and turbulence by calculating the power received, achieved data rate, and link margin. Different parameters were studied such as the wavelength, the transmitted power, the divergence angle, and the diameter of receiving optical antenna. The results show that the FSO performance can be improved using 1,550‐nm wavelength, increasing the transmitted power to a range of 5 mW and reducing the divergence angle to a range of 1 μrad.

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Design, Simulation and Testing of the OOK NRZ Modulation Format for Free Space Optic Communication in a Simulation Box

Cited by 21 publications

References 15 publications

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Performance Analysis of 16 × 2.5Gb/s FSO System for the Most Critical Weather Conditions

Effect of fog and scintillation on performance of vertical free‐space optical link from Earth to low Earth orbit satellite

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