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Aperture-array acquisition scheme for optical links in atmospheric turbulence.

Xuelian Ma¹, Lu Liu, Xiaoning Zhang

¹Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China.

|February 2, 2010

Summary

This study introduces an aperture-array acquisition scheme to reduce atmospheric turbulence effects on optical links. The new method effectively suppresses scintillation noise, enhancing detection probability for clearer atmospheric optical communication.

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Area of Science:

Optical Engineering
Atmospheric Optics
Free-space Optical Communication

Background:

Atmospheric turbulence causes scintillation, degrading optical signal detection probability during spatial acquisition.
Accurate spatial acquisition is critical for establishing robust atmospheric optical links.

Purpose of the Study:

To present and analyze an aperture-array acquisition scheme designed to mitigate scintillation noise.
To mathematically model and evaluate the long-term average detection probability (LTADP) of this scheme in turbulent atmospheres.

Main Methods:

Developed a mathematical model for LTADP using lognormal distribution for turbulent atmosphere conditions.
Considered probability density of average signal count when charge-coupled device (CCD) sample time is shorter than scintillation characteristic time.
Utilized an aperture array comprising N receiving elements, each with an aperture, optical filter, and CCD detector.

Main Results:

The aperture-array acquisition scheme effectively suppresses scintillation noise.
The proposed scheme enhances the long-term average detection probability (LTADP) compared to single-aperture systems under fixed signal-to-noise ratio.
Simulation results validate the effectiveness of the aperture-array approach in improving acquisition performance.

Conclusions:

The aperture-array acquisition scheme offers a viable solution for improving the reliability of atmospheric optical links.
This method provides enhanced detection probability by mitigating atmospheric turbulence effects.
The findings are significant for the advancement of free-space optical communication technologies.