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Maximizing atmospheric-disturbed fiber coupling efficiency with speckle-based phase retrieval and a single-pixel
Applied Optics
|September 14, 2023
Summary
Adaptive optics using a single-pixel camera (SPC) enhances fiber coupling efficiency in satellite-to-ground optical links. This method improves performance in turbulent conditions, especially for infrared wavelengths.
Area of Science:
- Optical engineering
- Free-space optical communication
- Adaptive optics
Background:
- Atmospheric turbulence significantly degrades optical signal quality in satellite-to-ground links.
- Traditional adaptive optics systems face limitations with high-speed operation and longer infrared wavelengths.
- Maximizing fiber coupling efficiency is crucial for reliable optical communication.
Purpose of the Study:
- To propose and evaluate a novel adaptive optics approach using a single-pixel camera (SPC) for enhanced fiber coupling efficiency.
- To enable adaptive optics operation at longer infrared wavelengths for free-space optical communication.
- To overcome limitations of conventional wavefront sensing techniques in challenging atmospheric conditions.
Main Methods:
- Utilizing a single-pixel camera (SPC) with compressed sensing to capture focal plane intensity images.
- Applying an iterative speckle-based phase retrieval algorithm to infer wavefront phase distortions.
- Implementing a feedback loop with a deformable mirror for real-time phase correction.
- Investigating performance in medium-to-strong atmospheric turbulence scenarios.
Main Results:
- Achieved a significant increase in fiber coupling efficiency from less than 5% to 40%-50%.
- Demonstrated the feasibility of using SPC-based adaptive optics for infrared wavelengths.
- Successfully inferred and corrected phase distortions caused by atmospheric turbulence.
- Overcame speed and wavelength limitations of Shack-Hartman-based approaches.
Conclusions:
- The proposed SPC-based adaptive optics system effectively maximizes fiber coupling efficiency in turbulent free-space optical links.
- This computational approach offers a viable solution for future optical satellite communication downlinks, particularly in the infrared spectrum.
- The method provides a robust and efficient alternative to traditional adaptive optics systems for challenging environments.
