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Optical Engineering

Group-delay-based phase-shifting method for Fourier domain optical coherence tomography
Author(s): Hsu-Chih Cheng; Jen-Fa Huang; Yi-Cheng Liu; Chien-Wen Chang; Yao-Tang Chang
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Paper Abstract

Frequency-domain optical coherence tomography (FD-OCT) has the advantages of an improved sensitivity and a reduced acquisition time since it enables cross-sectional images of the sample of interest to be obtained using a broadband source or a swept source. The phase-shifting method can always be applied to reduce the additional noise within FD-OCT and provide accurate signal processing. We present a phase-shifting method in which a parallel diffraction grating pair is inserted into the reference arm of the OCT system. The gratings separate the spectrum of the illuminating light and stretch the optical pulse in time thereby producing a linear group delay between the adjacent wavelengths in the superluminescent diode light source. The simulation results show that the proposed group-delay-based phase-shifting method improves the precision of the sample parameters extracted using the FD-OCT procedure compared to those obtained using traditional techniques such as the λ0/4 phase-shifting method.

Paper Details

Date Published: 1 July 2009
PDF: 12 pages
Opt. Eng. 48(7) 075004 doi: 10.1117/1.3184618
Published in: Optical Engineering Volume 48, Issue 7
Show Author Affiliations
Hsu-Chih Cheng, National Formosa Univ. (Taiwan)
Jen-Fa Huang, National Cheng Kung Univ. (Taiwan)
Yi-Cheng Liu, National Cheng Kung Univ. (Taiwan)
Chien-Wen Chang, National Cheng Kung Univ. (Taiwan)
Yao-Tang Chang, Kao Yuan Univ. (Taiwan)

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