Investigating of rain attenuation impact on Free Space Optics propagation in tropical region

2011 ◽  
Author(s):  
Suriza Ahmad Zabidi ◽  
Md. Rafiqul Islam ◽  
Wajdi Al Khateeb ◽  
Ahmed Wathik Naji
Keyword(s):  
Free Space ◽  
Rain Attenuation ◽  
Free Space Optics ◽  
Tropical Region ◽  
Space Optics

scholarly journals Feasibility Analysis Of Free Space Earth To Satellite Optical Link In Tropical Region

2012 ◽  
Vol 12 (5) ◽  
Author(s):  
Norhanis Aida M. Nor ◽  
Md. Rafiqul Islam ◽  
Wajdi Al-Khateeb
Keyword(s):  
Electromagnetic Interference ◽  
Free Space ◽  
Elevation Angle ◽  
Rain Attenuation ◽  
Low Earth Orbit ◽  
Feasibility Analysis ◽  
Free Space Optics ◽  
Tropical Region ◽  
Earth Orbit ◽  
Space Optics

Free Space Optics (FSO) becomes a great attention because of the chances in transmitting data up to 2.5Gbps. There are a lot of advantages offered by FSO such as easily deployment with saving time and cost and no electromagnetic interference. In spite of the advantages, FSO has an uncontrolled drawback which is highly sensitive to atmospheric phenomena because uses air as tranmission medium. Current studies and researches are only focusing on FSO terrestrial link with short path length and based on data from temperate region. Therefore, this paper is aiming to provide feasibility analysis of FSO link from earth to satellite especially Low Earth Orbit (LEO) based on atmospheric data in tropical region. The analysis will include the losses from geometrical attenuation, absorption, scintillation, haze attenuation, and rain attenuation. ABSTRAK: Ruang Bebas Optik (Free Space Optics (FSO)) mendapat perhatian kerana kebolehannya memancarkan data pada kelajuan tinggi. Di sebalik kelebihannya, FSO amat sensitif terhadap fenomena atmosfera kerana ia menggunakan udara sebagai perantara transmisi. Penyelidikan dan kajian terkini hanya memfokus kepada jalinan darat FSO dengan kepanjangan jarak pendek dan bergantung kepada kawasan tenang.  Oleh itu, kertas ini menyasarkan untuk memberikan analisis kebolehlaksanaan  jalinan FSO dari bumi ke satelit terutamanya Orbit Rendah Bumi (Low Earth Orbit (LEO)) bergantung kepada data atmosfera di kawasan tropika. Analisa termasuklah kehilangannya akibat pengecilan geometri, penyerapan, kelipan, pelemahan jerebu dan pelemahan hujan.KEYWORDS:  feasibility; Free Space Optics; availability; atmospheric attenuation; beam divergence angle; elevation angle

scholarly journals Analysis of Rain Effects on Terrestrial Free Space Optics based on Data Measured in Tropical Climate

2012 ◽  
Vol 12 (5) ◽  
Author(s):  
Suriza Ahmad Zabidi ◽  
Md. Rafiqul Islam ◽  
Wajdi Al-Khateeb ◽  
Ahmed Wathik Naji
Keyword(s):  
Fiber Optics ◽  
Free Space ◽  
Prediction Models ◽  
Tropical Climate ◽  
Rain Attenuation ◽  
Free Space Optics ◽  
Tropical Region ◽  
Communication Link ◽  
Free Space Optical ◽  
Space Optics

Free Space Optics (FSO) shows a great alternative as the solution for last mile problem where fiber optics is unavailable due to deployment time and cost constraint.  However, the feasibility of using FSO system as communication link very much depends on local weather.  Since tropical region experiences heavy rainfall, rain with high intensity is expected to affect the FSO link severely. Few prediction models have been proposed by ITU-R based on France and Japan’s measurement. This paper has compared  rain attenuation predicted by  models and  data measured in Malaysia over Free Space Optical links for one year period. Prediction models are clearly unable to predict attenuation measured in tropical climate. ABSTRAK: Wayarles optik menjadi alternatif sebagai satu penyelesaian kepada masalah kesesakan terutama diakhir sesuatu talian dimana ianya tidak dapat diselesaikan dengan menggunakan gentian fiber akibat daripada kekangan masa pemasangan dan masalah kewangan.  Walaubagaimanapun, kejayaan untuk menggunakan wayarless optic ini amat bergantung kepada keadaan cuaca di sesuatu tempat.  Di rantau tropika  hujan lebat sentiasa dialami, oleh itu hujan dengan kepadatan tinggi adalah dijangkakan lebih memberi kesan kepada talian wayarles optic ini. Beberapa model yang telah dicadangkan oleh ITU-R berlandaskan kepada pengumpulan data yang dibuat di Perancis dan Jepun.  Kertas kajian ini akan membandingkan antara model-model yang telah digunapakai dengan data yang dikumpulkan di Malaysia selama setahun.  Jelasnya model yang telah digunapakai tidak dapat digunakan secara berkesan di rantau tropika.KEYWORDS: free space optics; rainfall rate; rain attenuation

scholarly journals Performance Analysis of Single and Multiple Channel FSO System under Turbulent Conditions Using Various Models

2018 ◽  
Vol 7 (3.12) ◽  
pp. 14 ◽  
Author(s):  
A Sree Madhuri ◽  
M Venkata Narayana ◽  
Govardhani. Immadi
Keyword(s):  
Free Space ◽  
New Technologies ◽  
Rain Attenuation ◽  
Limiting Factors ◽  
Free Space Optics ◽  
Video Communications ◽  
Tropical Regions ◽  
Multiple Channel ◽  
Space Optics ◽  
Microwave Communications

Telecommunications occupying the major part of research across the world, has become a part and parcel of present day human’s life. As a part of research many new technologies emerged among which free space optics was found to be highly efficient and a competent technology. So, replacing the present microwave communications, in future free space optics provides many advantages like higher bandwidth, higher data rate (capable of sending up to 1.25 Gbps of data, voice, and video communications simultaneously through the air), low bit error rate and license free long-range communications etc. As a known fact that every coin has two sides, free space optics besides providing the above advantages also suffers from many range limiting factors like fog, beam dispersion, atmospheric absorption, rain attenuation, snow, terrestrial scintillation amongst which rain, scintillation and fog are popular in tropical regions like India. In this paper the effect of rain on FSO link is analysed in 1/1 and 4/4 channel cases and the results were analysed.  

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
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