Fast and high-resolution multimode fiber speckle imaging via optical coherence control

Area of Science:

• Optics
• Biomedical Imaging
• Fiber Optics

Background:

• Speckle imaging via multimode fibers (MMFs) offers minimally invasive, high-resolution imaging.
• Current serial sampling methods in MMF speckle imaging are limited by slow acquisition speeds.

Purpose of the Study:

• To develop a novel method for fast and high-resolution speckle imaging through MMFs.
• To overcome the speed limitations of traditional serial sampling techniques.

Main Methods:

• Utilized optical coherence control to generate both single-speckle and incoherent hybrid speckle patterns.
• Employed hybrid speckle patterns for parallel sampling to increase imaging speed.
• Applied the method to perturbation rejection MMF imaging systems.

Main Results:

• Achieved a Q-fold increase in sampling speed, where Q is the number of single speckle patterns per hybrid pattern.
• Reconstructed images demonstrated high fidelity with structural similarity indices >= 0.75.
• Maintained high image quality with peak signal-to-noise ratios >= 15.5 dB.

Conclusions:

• The proposed optical coherence control method significantly enhances MMF speckle imaging speed without compromising image quality.
• Hybrid speckle pattern illumination enables parallel sampling, a novel approach for accelerating MMF imaging.
• The technique is compatible with perturbation rejection systems, broadening its applicability.