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Phase-stability optimization of swept-source optical coherence tomography.

Sucbei Moon1,2, Zhongping Chen1,3

  • 1Beckman Laser Institute, University of California, Irvine, Irvine, CA 92617, USA.

Biomedical Optics Express
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Summary
This summary is machine-generated.

Signal delays in swept-source optical coherence tomography (SS-OCT) cause phase measurement instabilities. Optimizing these delays significantly enhances phase stabilization for clearer SS-OCT imaging.

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Area of Science:

  • Optical Engineering
  • Biomedical Imaging
  • Metrology

Background:

  • Phase-resolved imaging in swept-source optical coherence tomography (SS-OCT) faces challenges due to frequency-swept source variations.
  • Optically generated timing references are commonly used but can suffer from synchronization issues caused by relative time delays.

Purpose of the Study:

  • To investigate the impact of signal delays on timing instabilities in SS-OCT.
  • To quantify the resulting deviations in measured phases.
  • To demonstrate the effectiveness of delay optimization for phase stabilization.

Main Methods:

  • Analysis of phase measurement instabilities in SS-OCT systems.
  • Evaluation of timing signals, including fiber Bragg grating (FBG) sweep triggers and Mach-Zehnder interferometer (MZI) clock signals.
  • Investigation of relative signal delays between timing references.

Main Results:

  • Relative signal delays introduce significant timing instabilities via incoherent corrections and timing collisions.
  • Measured phase errors showed a best-to-worst ratio exceeding 200 solely due to variations in signal delays.
  • Phase stability comparable to noise limits was achieved with optimized delays and a dynamic range above 50 dB.

Conclusions:

  • Signal delays are a critical factor affecting phase stability in SS-OCT.
  • Optimizing signal delays is a highly effective strategy for achieving robust phase stabilization in SS-OCT systems.
  • This research provides a pathway for improving the accuracy and reliability of SS-OCT imaging.