1 Introduction
2 Description on system
configuration and basic parameters
2.1 Explanation of parameters
2.1.1 Transmitter side
2.1.2 Receiver side
2.2 System configuration
2.3 Basic
system parameters
3 Free-space propagation characteristics
relating to the link design
3.1 Clear-sky propagation
3.2 Effect of fog
3.2.1 Estimation of fog attenuation using
atmosphere visibility
3.2.2 Detailed analysis on aerosol attenuation (fog)
3.3 Effect of rain
3.4
Snow attenuation
3.5 Ambient
light attenuation
3.5.1
Solar trajectory
3.5.2
Solar power at the receiver
3.6
Scintillation effects
3.7 Other factors
4 Applications in the fixed service
4.1 General features
4.2 Basic application examples
4.3 Real
deployment examples
5 Link design
consideration
5.1
Link margin
5.1.1
Spot
diameter
5.1.2 Geometrical attenuation
5.1.3 Molecular attenuation
5.1.4 Received level
5.1.5
Wavelength
front beam homogeneity
5.1.6 Margin for the unit distance
6 Deployment of FSOL in specific climatic
areas
7 Consideration on the operational aspect
7.1
Propagation
times
7.2
Transmitted
data confidentiality
7.3
Guidelines
for implement FSOL
7.3.1
FSO
installation process
7.3.2
FSO
alignment process example
7.4
Multi FSOLs
8 Summary
Annex 1
Examples of the link budget
1 Example of the link budget
2 Example of FSO
availability prediction
2.1
Some
link margin
2.2
Availability and Quality of Service
2.2.1
Example
of minimum visibility calculation
2.2.2 Example of weather statistical data
2.2.3 Example of a link availability
calculation
2.2.4 Example of availability according to
the link distance
Annex 2 Comparison between ITU-R
Recommendations and “FSO prediction” Quality of Service Software (Experimentation in France)
1 Introduction
2 FSOL field test
2.1
Site
and equipment characteristics
2.2
Link
design
2.2.1
Engineering
data
2.2.2
Field
data
3 Simulation software
3.1 Capture data window
3.2 Report window
3.3 Profile window
4 Results comparison
4.1
Comparison
FSO prediction versus FSO and France weather station
4.1.1
Aerosol
attenuation (fog)
Fog radiation attenuation example (see equation (3) in § 3.2.2 in the main
text)
4.1.2
Other attenuation
4.2
QoS
comparison and availability FSO versus ITU-R Recommendation
4.2.1
Comparison of QoS FSO versus Recommendation
ITU-R F.1668
4.2.2
Comparison
of FSO availability versus Recommendation ITU-R F.1703
4.3
Comparison of FSOL availability versus FSO prediction
software
5 Conclusion