Signal-to-noise ratio analysis of all-fiber common-path optical coherence tomography

Xiaolu Li, Jae Ho Han, Xuan Liu, Jin U. Kang

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


We present theoretical analysis and experimental verification of the signal to noise ratio (SNR) of a common-path interferometer-based optical coherence tomography (OCT) system. Based on fully integrated all-fiber implementation of a common-path time-domain OCT system, we derived the SNR of the system including the effect of beat noise, which turns out to be twice as large as the excess noise term. We verified the theoretical SNR through a series of experiments, utilizing both controlled phantom and biological samples such as a rat brain with tumor and a frog retina. The results showed that the source power and the reference reflectivity can be easily controlled to optimize the SNR of OCT imaging. We have also analyzed the effect of the fiber delays and the offset in the fiber autocorrelator of the common-path OCT system on the overall SNR.

Original languageEnglish
Pages (from-to)4833-4840
Number of pages8
JournalApplied optics
Issue number27
Publication statusPublished - 2008 Sep 20
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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