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Mode-filtered large-core fiber for optical coherence tomography.

Sucbei Moon1, Zhongping Chen

  • 1Department of Physics, Kookmin University, Seoul 136-702, South Korea.

Applied Optics
|December 5, 2012
PubMed
Summary

Researchers developed a novel fiber-coil mode filter to suppress high-order modes in large-core fibers for optical coherence tomography (OCT). This innovation enables simpler, lens-free OCT imaging probes using multimode fiber.

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Area of Science:

  • Optical Engineering
  • Biomedical Optics
  • Fiber Optics

Background:

  • Conventional single-mode fiber in optical coherence tomography (OCT) has limitations in mode area and Rayleigh range.
  • Multimode fibers (MMF) offer advantages like larger mode area but require management of high-order modes (HOMs).

Purpose of the Study:

  • To investigate the use of multimode fiber in OCT by developing a mode filter to suppress HOMs.
  • To demonstrate the feasibility of a mode-filtered large-core fiber (LCF) as a simplified OCT imaging probe.

Main Methods:

  • Developed a simple fiber-coil mode filter to selectively suppress HOMs in a large-core fiber (LCF).
  • Utilized a specially devised fiber winder to coil the LCF at an optimal bend radius for low-loss mode filtering.
  • Tested the mode-filtered LCF in a common-path OCT system for imaging feasibility.

Main Results:

  • Successfully suppressed high-order modes in the LCF using the developed fiber-coil mode filter.
  • Demonstrated that the mode-filtered LCF provides a wide Rayleigh range, comparable to or better than single-mode fiber.
  • Achieved OCT imaging using the mode-filtered LCF without an objective lens, simplifying the probe structure.

Conclusions:

  • A fiber-coil mode filter effectively suppresses HOMs in LCF, making it suitable for OCT.
  • Mode-filtered LCF offers a simplified, lens-free probe design for OCT imaging and sensing applications.
  • This approach enhances the practicality and reduces the complexity of OCT systems.