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Updated: Mar 26, 2026
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
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Outage capacity of FSO link with pointing errors and link blockage.
Optics Express
|February 3, 2016
Summary
This study analyzes free-space optical (FSO) system performance, considering factors like beam blockage and atmospheric turbulence. Results reveal an optimal beam radius to minimize outage probability and achieve desired capacity.
Area of Science:
- Optical Communications
- Wireless Systems Engineering
- Signal Processing
Background:
- Free-space optical (FSO) systems offer high bandwidth but are susceptible to performance degradation.
- Key challenges include atmospheric turbulence, pointing errors, and temporary link blockages.
- Accurate modeling of outage capacity is crucial for reliable FSO system design.
Purpose of the Study:
- To derive novel analytical expressions for outage capacity in FSO systems.
- To investigate the impact of stochastic link blockage, atmospheric turbulence, and misalignment.
- To identify optimal system parameters for minimizing outage probability.
Main Methods:
- Mathematical modeling of FSO channel incorporating various impairments.
- Utilizing Gamma-Gamma distribution to represent intensity fluctuations due to atmospheric conditions.
- Validation of analytical results through Monte Carlo simulations.
- Derivation of simplified expressions for specific conditions (e.g., turbulence-only).
Main Results:
- Accurate analytical expressions for outage capacity derived, considering multiple impairments.
- Stochastic link blockage introduces an outage floor, a critical performance metric.
- An optimal laser beam radius at the waist minimizes outage probability for a target outage capacity.
- Optimal beam radius is influenced by turbulence, pointing errors, and blockage probability.
Conclusions:
- The derived analytical expressions provide a robust tool for FSO system performance evaluation.
- Link blockage significantly impacts FSO system reliability, necessitating careful design considerations.
- Optimizing beam radius is essential for maximizing FSO system performance under various environmental conditions.
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