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Free space Communication details.
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1
Supervised by:
Prof. Magdy Ibrahim
Prepared by:
Ahmed Ashraf Abdel-Haseb
Ahmed-Houssam Mahmoud
Ahmed Magdy El-Sayed
Amr Atef Hussein
Mohamed Khaled Abo-Seif
Free Space Optical Communication (FSO)
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Supervised by:
Prof. Magdy Ibrahim
Prepared by:
Ahmed Ashraf Abdel-Haseb
Ahmed-Houssam Mahmoud
Ahmed Magdy El-Sayed
Amr Atef Hussein
Mohamed Khaled Abo-Seif
Free Space Optical Communication (FSO)
• Introduction [1]
• Free Space Optical Link Design [2]
• Applications [3]
• FSO vs. Fiber vs. Microwave Links
3
Outlines
• Introduction [1]
• Free Space Optical Link Design [2]
• Applications [3]
• FSO vs. Fiber vs. Microwave Links
4
Outlines
• Operation of FSO
• Uses
• Advantages and Disadvantages
• Security Aspects
• Safety Aspects
04/08/2023 5
Introduction
• Operation of FSO
• Uses
• Advantages and Disadvantages
• Security Aspects
• Safety Aspects
04/08/2023 6
Introduction
• Operation of FSO
• Uses• To cross a public road or other barriers which the
sender and receiver do not own.
• For communications between spacecraft.
• Speedy service delivery of high-bandwidth access to optical fiber networks.
• Advantages and Disadvantages
• Security Aspects
• Safety Aspects
04/08/2023 7
Introduction
• Operation of FSO
• Uses
• Advantages and DisadvantagesAdvantages• License-free operation.• High bit rates.• Low bit error rates.• Immunity to electromagnetic interference.• Security.• Easiness and speed of installation.
• Security Aspects
• Safety Aspects
04/08/2023 8
Introduction
• Operation of FSO
• Uses
• Advantages and DisadvantagesDisadvantages• Beam dispersion.• Atmospheric absorption.• Rain, Snow, Fog (10..~100 dB/km attenuation).• Background light.
• Security Aspects
• Safety Aspects
04/08/2023 9
Introduction
• Operation of FSO
• Uses
• Advantages and Disadvantages
• Security Aspects
• Safety Aspects
04/08/2023 10
Introduction
• Operation of FSO
• Applications
• Advantages and Disadvantages
• Security Aspects
• Safety Aspects• Eye Damage
04/08/2023 11
Introduction
• Introduction [1]
• Free Space Optical Link Design [2]
• Applications [3]
• FSO vs. Fiber vs. Microwave Links
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Outlines
• FSO Subsystems
• FSO Link Equation and Link Budget
• Theoretical Range Limit
• BER, Data Rate, and Range
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Free Space Optical Link Design
• FSO Subsystems
1. Transmitter
2. Receiver
3. Tracking System
• FSO Link Equation and Link Budget
• Theoretical Range Limit
• BER, Data Rate, and Range
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Free Space Optical Link Design
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• FSO Subsystems
1. Transmitter
2. Receiver
3. Tracking System
• Requirements:
Tracking Frequency, Resolution, Speed, … etc.
• FSO Link Equation and Link Budget
• Theoretical Range Limit
• BER, Data Rate, and Range
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Free Space Optical Link Design
• FSO Subsystems
• FSO Link Equation and Link BudgetLink Equation:
Link Budget:
• Theoretical Range Limit
• BER, Data Rate, and Range
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Free Space Optical Link Design
• FSO Subsystems
• FSO Link Equation and Link Budget
• Theoretical Range Limit• Assume Perfect Components (no thermal Noise)• For : =>
• BER, Data Rate, and Range
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Free Space Optical Link Design
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• FSO Subsystems
• FSO Link Equation and Link Budget
• Theoretical Range Limit
• BER, Data Rate, and Range
.
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Free Space Optical Link Design
21
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• Introduction [1]
• Free Space Optical Link Design [2]
• Applications [3]
• FSO vs. Fiber vs. Microwave Links
23
Outlines
Free Space Optical Networks
• Point to Point FSO Systems
• Mesh FSO Systems
FSO on HAPs (Future Application)
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Applications
Free Space Optical Networks • Point to Point FSO Systems
• Mesh FSO Systems
FSO on HAPs (Future Application)
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Applications
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1 Network traffic converted into pulses of invisible light representing 1’s and 0’s
2 Transmitter projects the carefully aimed light pulses into the air
5 Reverse direction data transported the same way.
• Full duplex
3 A receiver at the other end of the link collects the light using lenses and/or mirrors
4Received signal converted back into fiber or copper and connected to the networkAnything that can be done in
fiber can be done with FSO26
Applications
Free Space Optical Networks • Point to Point FSO Systems
Disadvantages• Cannot connect more than 2 points
• The points cannot have arbitrary distance between them
• Has the poorest network and traffic protection
• Mesh FSO Systems
FSO on HAPs (Future Application)
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Applications
Free Space Optical Networks • Ring FSO Systems
• Mesh FSO Systems
FSO on HAPs (Future Application)
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Applications
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Nodes of a mesh - FSO topology on fl at terrain but with nodes at different heights.
Free Space Optical Networks • Ring FSO Systems
• Mesh FSO SystemsAdvantages
• The best network and service protection
• Very high data rates
• Scalability and expandability
FSO on HAPs (Future Application)
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Applications
Free Space Optical Networks • Ring FSO Systems
• Mesh FSO SystemsDisadvantages
• The complexity of each node in the mesh topology.
• High Cost
FSO on HAPs (Future Application)
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Applications
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Nodes over a geographical territory with line of sight between them.
Free Space Optical Networks • Ring FSO Systems• Mesh FSO Systems
FSO on HAPs (Future Application)• Use on high altitude platforms (HAPs), (20 –
30 Km).• Estimated Range: more than 600km.
• .
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Applications
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Free Space Optical Networks • Ring FSO Systems• Mesh FSO Systems
FSO on HAPs (Future Application)Advantages:• Stratospheric Conditions.• Low attenuation, no cloud interference, low
tempreture…etc.• Cost Effective (Compared to Satellites)• FSO Advantages• High Data rate, Low Power Consumption …etc.
• .
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Applications
• Introduction [1]
• Free Space Optical Link Design [2]
• Applications [3]
• FSO vs. Fiber vs. Microwave Links
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Outlines
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FSO vs. Fiber vs. Microwave Links
Criteria FSOOptical Fiber
Microwave
Data rate Up to 10 Gbps 100 Mbps to 100 Gbps
275 Mbps
Installation Easy Difficult Moderate
Cost Moderate High Moderate
Maintenance
low High low
Most common
uses
Between buildings
Short distance
Point-to point
Long distance
Point-to-point
Short distance
Advantages
Price
performance
No license
Security
capacity and speed
Immunity to EMI
speed
Disadvantages
Can be intercepted
Difficult to splice determinate
Can be intercepted
Requires radio license
Security Moderate Excellent Poor
[1] S.V. Kartalopoulos , “ Disaster Avoidance in the Manhattan Fiber Distributed Data Interface Network , ” Globecom ’ 93, Houston, TX, December 2, 1993 .
[2] Scott Bloom, “The Physics of Free Space Optics”, AirFiber, Inc.
[3] “Free-Space Optical Communications on HAPs”, www.hapcos.org , accessed on : 13-May-2012
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References
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Thanks