Study of atmospheric effect in free space optic propagation

Free Space Optic (FSO) telecommunication system is Line of Sight (LOS) system which refer to transmission of visible and infrared beams that through to atmosphere to obtain the optical communication. This system uses laser to transmit the data in free space. However this system is vulnerable with...

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Main Author:	Abdul Rahman, Kram
Format:	Thesis
Language:	English
Subjects:	Free Space Optic (FSO) Telecommunication Weather Attenuation
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/2/Full%20Text.pdf
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spelling	my-unimap-121792011-06-05T03:52:36Z Study of atmospheric effect in free space optic propagation Abdul Rahman, Kram Free Space Optic (FSO) telecommunication system is Line of Sight (LOS) system which refer to transmission of visible and infrared beams that through to atmosphere to obtain the optical communication. This system uses laser to transmit the data in free space. However this system is vulnerable with variation of air turbulence particles that occurs in atmosphere. This thesis is aim to investigate the attenuation effect over the point-to-point FSO communication linkage. The study carried out under the tropical rainforest climate and the sample data is take at Perlis region that provide by Malaysia Meteorological Department (MMD). There two type of weather condition that capable to impair the FSO link performance. The first is rain weather where the rainfall occurs in tropical rainforest region almost everyday and has a high rain denseness rate. The second is haze weather which is usually contributed by smoke that produced from open burning of agriculture. The continuous burning and in wide area have produce the high density of haze to environment weather which create limited distance for visibility. Consequently, haze and rain can contribute to high atmospheric attenuation and predicted capable to impair the FSO link performance. Two approaches have been used in this research. The first is modeling the rain and haze attenuation to investigate the Perlis weather pattern in order to determine how strong the attenuation can occur in FSO communication linkage. This atmospheric model for haze and rain are constructed from scattering coefficients, atmospheric attenuation and geometric loss equation. The second approach is develop the FSO system using the OptiSystem to observe the effects attenuation over the link system. The performance of this FSO system is investigate under different parameters wavelength, size of aperture for transmitter and receiver, beam divergence angle and receiver sensitivity. The result from this research shows the haze weather effect is worst than rain where the maximum haze and rain attenuation can reach 180 dB/km and 96 dB/km respectively. At aim distance 1km operational for FSO deployment the prediction maximum visibility haze is 0.8km and rainfall rate is 70mm/hr. Meanwhile in simulation analysis shows that the longer wavelength 1550nm is much better than 785nm. The Design 1 for receiver aperture size 0.25m and transmitter aperture size 0.05m can reduce the loss. 5arrow beam divergence angle can reduce the power consumption and maintain the high power at receiver and also the APD photodiode is much better than p-i-n photodiode due to have high sensitivity to detect weak signal. Universiti Malaysia Perlis 2010 Thesis en http://dspace.unimap.edu.my/123456789/12179 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/3/license.txt 9782281e41a3f68ecba8220c4cb33fde http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/1/p.1-24.pdf c0cd7cca62a8546587a94ee19dd27b16 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/2/Full%20Text.pdf 638e0b4d9d90491301ce8acd9add437a Free Space Optic (FSO) Telecommunication Weather Attenuation School of Computer & Communication Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
topic	Free Space Optic (FSO) Telecommunication Weather Attenuation
spellingShingle	Free Space Optic (FSO) Telecommunication Weather Attenuation Abdul Rahman, Kram Study of atmospheric effect in free space optic propagation
description	Free Space Optic (FSO) telecommunication system is Line of Sight (LOS) system which refer to transmission of visible and infrared beams that through to atmosphere to obtain the optical communication. This system uses laser to transmit the data in free space. However this system is vulnerable with variation of air turbulence particles that occurs in atmosphere. This thesis is aim to investigate the attenuation effect over the point-to-point FSO communication linkage. The study carried out under the tropical rainforest climate and the sample data is take at Perlis region that provide by Malaysia Meteorological Department (MMD). There two type of weather condition that capable to impair the FSO link performance. The first is rain weather where the rainfall occurs in tropical rainforest region almost everyday and has a high rain denseness rate. The second is haze weather which is usually contributed by smoke that produced from open burning of agriculture. The continuous burning and in wide area have produce the high density of haze to environment weather which create limited distance for visibility. Consequently, haze and rain can contribute to high atmospheric attenuation and predicted capable to impair the FSO link performance. Two approaches have been used in this research. The first is modeling the rain and haze attenuation to investigate the Perlis weather pattern in order to determine how strong the attenuation can occur in FSO communication linkage. This atmospheric model for haze and rain are constructed from scattering coefficients, atmospheric attenuation and geometric loss equation. The second approach is develop the FSO system using the OptiSystem to observe the effects attenuation over the link system. The performance of this FSO system is investigate under different parameters wavelength, size of aperture for transmitter and receiver, beam divergence angle and receiver sensitivity. The result from this research shows the haze weather effect is worst than rain where the maximum haze and rain attenuation can reach 180 dB/km and 96 dB/km respectively. At aim distance 1km operational for FSO deployment the prediction maximum visibility haze is 0.8km and rainfall rate is 70mm/hr. Meanwhile in simulation analysis shows that the longer wavelength 1550nm is much better than 785nm. The Design 1 for receiver aperture size 0.25m and transmitter aperture size 0.05m can reduce the loss. 5arrow beam divergence angle can reduce the power consumption and maintain the high power at receiver and also the APD photodiode is much better than p-i-n photodiode due to have high sensitivity to detect weak signal.
format	Thesis
author	Abdul Rahman, Kram
author_facet	Abdul Rahman, Kram
author_sort	Abdul Rahman, Kram
title	Study of atmospheric effect in free space optic propagation
title_short	Study of atmospheric effect in free space optic propagation
title_full	Study of atmospheric effect in free space optic propagation
title_fullStr	Study of atmospheric effect in free space optic propagation
title_full_unstemmed	Study of atmospheric effect in free space optic propagation
title_sort	study of atmospheric effect in free space optic propagation
granting_institution	Universiti Malaysia Perlis
granting_department	School of Computer & Communication Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12179/2/Full%20Text.pdf
_version_	1747836758492446720

Study of atmospheric effect in free space optic propagation

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