All-fiber common-path optical coherence tomography: Sensitivity optimization and system analysis

Utkarsh Sharma, Nathaniel M. Fried, Jin U. Kang

Research output: Contribution to journalArticle

Abstract

A fully integrated all-fiber implementation of common-path interferometer-based optical coherence tomography (OCT) has been successfully demonstrated. Unlike conventional Michelson-based OCT systems, there is no separate reference arm as the reference signal is derived from the probe-end back reflection. This leads to "downlead insensitivity," which makes the device more compatible with existing endoscopic medical instruments. We also theoretically analyze the optimization of system sensitivity in balanced and unbalanced detection. We have conducted experiments to confirm some of our signal-to-noise ratio (SNR) analysis, which are in excellent agreement with the theory. Interestingly, our analysis predicts existence of much higher beat noise in common-path OCT as compared with the conventional OCT. We predict a maximum upper limit of only 6-dB improvement in the SNR when the balanced detection is used, as compared with the unbalanced detection.

Original languageEnglish (US)
Pages (from-to)799-805
Number of pages7
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume11
Issue number4
DOIs
StatePublished - Jul 2005

Fingerprint

Optical tomography
systems analysis
optical paths
tomography
Systems analysis
optimization
fibers
Fibers
sensitivity
Signal to noise ratio
signal to noise ratios
Interferometers
synchronism
interferometers
probes
Experiments

Keywords

  • Medical and biological imaging
  • Medical optics instrumentation
  • Noise in imaging systems
  • Optical coherence tomography (OCT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

All-fiber common-path optical coherence tomography : Sensitivity optimization and system analysis. / Sharma, Utkarsh; Fried, Nathaniel M.; Kang, Jin U.

In: IEEE Journal on Selected Topics in Quantum Electronics, Vol. 11, No. 4, 07.2005, p. 799-805.

Research output: Contribution to journalArticle

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