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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Maximizing atmospheric-disturbed fiber coupling efficiency with speckle-based phase retrieval and a single-pixel

Mohamadreza Pashazanoosi, Michael Taylor, Oliver Pitts

|September 14, 2023

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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.

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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.