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Heterodyne receivers for atmospheric optical communications
Applied Optics
|March 11, 2010
Summary
This study analyzes optical heterodyne receiver performance in turbulent atmospheres. Adaptive processors and spatial diversity significantly reduce error probabilities for clear-air optical communication systems.
Area of Science:
- Optical Engineering
- Atmospheric Optics
- Communication Systems
Background:
- Turbulent atmospheres degrade optical communication signals.
- Optical heterodyne receivers are crucial for high-performance optical links.
- Adaptive signal processing can mitigate atmospheric turbulence effects.
Purpose of the Study:
- To evaluate optical heterodyne receiver performance in clear-air turbulence.
- To develop adaptive processors for improved signal demodulation.
- To determine the impact of turbulence, signal strength, and diversity on system errors.
Main Methods:
- Development of optimum and suboptimum adaptive processors.
- Analysis of synchronous and envelope demodulation techniques.
- Calculation of error probabilities for binary orthogonal systems.
- Derivation of an expression for optimum receiver aperture size.
Main Results:
- Adaptive processors significantly reduce error probabilities.
- Increased turbulence level leads to higher error rates.
- Higher signal strength and spatial diversity improve system performance.
- An optimal aperture size expression is derived for heterodyne receivers.
Conclusions:
- Adaptive processing and spatial diversity are effective strategies for mitigating turbulence in optical communication.
- The developed expressions provide valuable insights for designing robust optical communication systems.
- Understanding the interplay of turbulence, signal strength, and receiver parameters is key to reliable optical links.
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