Optical Attenuation & Atmospheric Visibility of Free Space Optics

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Beenish Hafeez ◽  
Shahid Iqbal ◽  
Areeba Asif ◽  
Meera Tariq
Keyword(s):  
Dust Storm ◽  
Free Space ◽  
Paper Analysis ◽  
Dust Particles ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Space Optics ◽  
Optical Attenuation ◽  
Communication Links ◽  
Dust Effects

The study was conducted at University of Gujrat during 2015 with an objective to explore the effects of dust on Free Space Optics (FSO) communication. Growing pollution and dust gales motivated studies we presented in this paper. In this paper analysis of the influence of dust on free space optics communication is presented. We focused our studies on Lahore as it is polluted city of Punjab and made a comparison with dust effects in Rahimyar Khan Region. Dense dust consists of large dust particles that raise from Earths sphere and whose atmospheric intensification values are high enough to affect FSO communication links. Dust storm research is based on visibility data. In order to test visibility data, we made calculations of atmospheric conditions for different dust conditions. Visibility of wave is calculated using weather spark. As it is related with the optical attenuation, so we also calculated optical attenuation of dust particles due to influence of dust particles and compared it with that of Rahimyar Khan.

Estimation of optical attenuation in reduced visibility conditions in different environments across free space optics link

2017 ◽  
Vol 11 (12) ◽  
pp. 1708-1713 ◽  
Author(s):  
Kapal Dev ◽  
Roberto Nebuloni ◽  
Carlo Capsoni ◽  
Ondrej Fiser ◽  
Vladimir Brazda
Keyword(s):  
Free Space ◽  
Free Space Optics ◽  
Space Optics ◽  
Optical Attenuation

scholarly journals Free space optics communication system design using iterative optimization

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gebrehiwet Gebrekrstos Lema
Keyword(s):  
Optical Communication ◽  
Communication System ◽  
Free Space ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Eye Diagram ◽  
Iterative Optimization ◽  
Space Optics ◽  
Wireless Optical Communication ◽  
Visibility Distance

AbstractFree Space Optics (FSO) communication provides attractive bandwidth enhancement with unlicensed bands worldwide spectrum. However, the link capacity and availability are the major concern in the different atmospheric conditions. The reliability of the link is highly dependent on weather conditions that attenuate the signal strength. Hence, this study focuses to mitigate the weather and geographic effects using iterative optimization on FSO communication. The optimization maximizes the visibility distance while guaranteeing the reliability by minimizing the Bit Error Rate (BER). The wireless optical communication system is designed for the data rate of 10 Gbps. The performance of the proposed wireless optical communication is compared against the literature in terms of visibility distance, quality factor, BER, and Eye diagram at different atmospheric conditions. The simulation results have shown that the proposed work has achieved better performance.

scholarly journals Investigations on Bit error rate performance of DWDM Free space optics system using Semiconductor Optical Amplifier in Rain Environment

2013 ◽  
Vol 8 (3) ◽  
pp. 853-861
Author(s):  
Charu Sharma ◽  
Sukhbir Singh
Keyword(s):  
Semiconductor Optical Amplifier ◽  
Free Space ◽  
Optical Amplifier ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Bit Rate ◽  
Free Space Optical ◽  
Long Distance ◽  
Receiver Sensitivity ◽  
Space Optics

Optical fibers till date are the highest data capacity supported network. The bandwidth supported by fibers is very high but deploying fibers in many cases is not possible. In this scenario the alternate approach that can carry same data rate is FSO (Free space optics) but FSO link can not support a long distance transmission because FSO links are affected by the atmospheric conditions adversely.To increase the link distance of FSO, optical amplification of signal can be done. In this paper use of SOA (Semiconductor optical amplifier) as preamplifier is presented, performance of free space optical system is investigated with varying number of channels and with varying channel spacing. With 8 channels, 10 dBm input power the link range is 6.5 Km, for 16 channels it is 5.1 Kms.Investigation on bit rate and receiver sensitivity is also done. Maximum bit rate achieved with WDM system is 10 Gbps and receiver sensitivity with varying bit rate values are analyzed and found that receiver is most sensitive with 2.5 Gbps.

scholarly journals Experimental Study of the Free Space Optics Communication System Operating in the 8–12 µm Spectral Range

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 875
Author(s):  
Magdalena Garlinska ◽  
Agnieszka Pregowska ◽  
Izabela Gutowska ◽  
Magdalena Osial ◽  
Janusz Szczepanski
Keyword(s):  
Free Space ◽  
Optical Radiation ◽  
Near Infrared ◽  
Quantum Cascade Lasers ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Light Rain ◽  
Space Optics ◽  
Transmission Properties ◽  
Limited Visibility

(1) Background: Free space optics communication (FSO) has improved wireless communication and data transfer thanks to high bandwidth, low power consumption, energy efficiency, a high transfer capacity, and a wide applicability field. The FSO systems also have their limitations, including weather conditions and obstacles in the way of transmission. (2) Methods: This research assesses the atmospheric conditions’ influence on the intensity of received radiation, both experimentally and theoretically. The construction of a laboratory test stand of the FSO system, which is operating in the third-atmosphere transmission window (8–12 µm), is proposed. Next, considering different atmospheric conditions, the experimental validation was conducted, both in a laboratory and real conditions. (3) Results: The measurements were carried out for two optical links working with wavelengths of 1.5 µm and 10 µm. It was found that optical radiation with a wavelength of about 10 µm is characterized by better transmission properties in the case of limited visibility (e.g., light rain and fogs) than in the case of near-infrared waves. The same conclusion was found in analytical investigations. (4) Conclusions: The results obtained show that optical radiation with a wavelength of about 10 µm in limited visibility is characterized by better transmission properties than near-infrared waves. This demonstrates the validity of designing FSO links operating in the range 8–12 µm band, e.g., based on quantum cascade lasers and HgCdTe photodiodes.

Performance analysis of WDM free space optics transmission system using MIMO technique under various atmospheric conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kavitha Thandapani ◽  
Maheswaran Gopalswamy ◽  
Sravani Jagarlamudi ◽  
Naveen Babu Sriram
Keyword(s):  
Wavelength Division Multiplexing ◽  
Free Space ◽  
Multiple Input Multiple Output ◽  
Atmospheric Conditions ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Space Optics ◽  
Space Optical Communication ◽  
Input Multiple Output ◽  
And Performance

Abstract Free Space Optical (FSO) communication has evolved as a feasible technique for wireless implementations which offers higher bandwidth capacities over various wavelengths and refers to the transmission of modulated visible beams through atmosphere in order to communicate. Wavelength Division Multiplexing (WDM) is a technology that multiplexes numerous carrier signals onto single fiber using nonidentical wavelengths and enables the efficiency of bandwidth and expanded data rate. Multiple Input Multiple Output (MIMO) is implemented to improve the quality and performance of free space optical communication in various atmospheric conditions. In this paper, a WDM-based FSO communication system is being implemented that benefits from MIMO which receives multiple copies of the signal at receiver that are independent and analyzed for various streams of data in MIMO i.e. 2 × 2, 4 × 4, 8 × 8. Various factors like BER, Quality Factor are analyzed for the WDM-based FSO communication with MIMO using the OptiSystem for various data streams of MIMO under different atmospheric conditions.

scholarly journals A Survey of Free Space Optics (FSO) Communication Systems, Links, and Networks

IEEE Access ◽  
2020 ◽  
pp. 1-1
Author(s):  
Samir A. Al-Gailani ◽  
Mohd Fadzli Mohd Salleh ◽  
Ali A. Salem ◽  
Redhwan Q. Shaddad ◽  
Usman Ullah Sheikh ◽  
...  
Keyword(s):  
Free Space ◽  
Communication Systems ◽  
Free Space Optics ◽  
Space Optics
Sign in / Sign up

Export Citation Format

Share Document