scholarly journals Free Space Optics: Current Applications and Future Challenges

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Aditi Malik ◽  
Preeti Singh
Keyword(s):  
Atmospheric Turbulence ◽  
Free Space ◽  
Outer Space ◽  
Weather Conditions ◽  
Optical Signal ◽  
Free Space Optics ◽  
Successful Transmission ◽  
Space Optics ◽  
Future Challenges ◽  
High Bandwidth

FSO is a communication system where free space acts as medium between transceivers and they should be in LOS for successful transmission of optical signal. Medium can be air, outer space, or vacuum. This system can be used for communication purpose in hours and in lesser economy. There are many advantages of FSO like high bandwidth and no spectrum license. The transmission in FSO is dependent on the medium because the presence of foreign elements like rain, fog, and haze, physical obstruction, scattering, and atmospheric turbulence are some of these factors. Different studies on weather conditions and techniques employed to mitigate their effect are discussed in this paper.

Improved Performance Analysis of Free Space Optics Communication Link under Rain Conditions using EDFA Pre-amplifier

2018 ◽  
Vol 39 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Performance Analysis ◽  
Free Space ◽  
Weather Conditions ◽  
Fiber Amplifier ◽  
Free Space Optics ◽  
Communication Link ◽  
Erbium Doped Fiber Amplifier ◽  
Space Optics ◽  
Link Distance ◽  
Improved Performance

AbstractFree Space Optics (FSO) also known as Optical Wireless Communication (OWC) is a communication technology in which free space/air is used as the propagation medium and optical signals are used as the information carriers. One of the most crucial factors which degrade the performance of FSO link is the signal attenuation due to different atmospheric weather conditions such as haze, rain, storm, and fog. In this paper, an improved performance analysis of a 2.5 Gbps FSO link under rain conditions has been reported using Erbium-Doped Fiber Amplifier (EDFA) as a pre-amplifier. The results show that the maximum link distance for an FSO link under rain weather conditions with acceptable performance levels (Q$$\sim6$$and BER$$ \le {10^{- 9}})$$in the absence of EDFA pre-amplifier is 1,250 m which increases to 1,675 m with the use of EDFA pre-amplifier.

scholarly journals Internet Connectivity: Is Free Space Optics the Solution?

2021 ◽  
Vol 2075 (1) ◽  
pp. 012016
Author(s):  
SS Rais ◽  
H Husni
Keyword(s):  
Free Space ◽  
Free Space Optics ◽  
Online Activity ◽  
Internet Connectivity ◽  
Space Optics ◽  
Internet Availability ◽  
High Bandwidth

Abstract During the Coronavirus disease 2019 pandemic era, poor internet availability hampered online activity, particularly in the sector of education in Malaysia. The most effective way to address this situation is through the construction of telecommunications towers. However, it takes time due to the significant costs involved. Outdoor use of FSO appears to be more advantageous due to the absence of licensing requirements and the high bandwidth it offers. However, there are limitations. We will explore these FSO restrictions in this paper.

Design of high speed multistream free space optics link under clear weather conditions

2020 ◽  
Vol 3 (3/4) ◽  
pp. 195
Author(s):  
Shantanu Jagdale ◽  
Brijesh Iyer ◽  
Sanjay L. Nalbalwar ◽  
Shankar B. Deosarkar
Keyword(s):  
Free Space ◽  
High Speed ◽  
Weather Conditions ◽  
Free Space Optics ◽  
Space Optics ◽  
Clear Weather

Realization of free space optics with OFDM under atmospheric turbulence

Optik ◽  
2014 ◽  
Vol 125 (18) ◽  
pp. 5196-5198 ◽  
Author(s):  
Sushank Chaudhary ◽  
Angela Amphawan ◽  
Kashif Nisar
Keyword(s):  
Atmospheric Turbulence ◽  
Free Space ◽  
Free Space Optics ◽  
Space Optics

scholarly journals Recovery Capabilities of Rateless Codes on Simulated Turbulent Terrestrial Free Space Optics Channel Model

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
A. Andò ◽  
S. Mangione ◽  
L. Curcio ◽  
S. Stivala ◽  
G. Garbo ◽  
...  
Keyword(s):  
Free Space ◽  
Channel Model ◽  
Optical Power ◽  
Optical Signal ◽  
Free Space Optics ◽  
Optical Turbulence ◽  
High Data ◽  
Space Optics ◽  
Error Mitigation ◽  
Channel Codes

Free Space Optics (FSO) links are affected by several impairments: optical turbulence, scattering, absorption, and pointing. In particular, atmospheric optical turbulence generates optical power fluctuations at the receiver that can degrade communications with fading events, especially in high data rate links. Innovative solutions require an improvement of FSO link performances, together with testing models and appropriate channel codes. In this paper, we describe a high-resolution time-correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by optical turbulence. Concerning the same channel, we also report simulation results on the error mitigation performance of Luby Transform, Raptor, and RaptorQ codes.

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