Group-delay-based phase-shifting method for Fourier domain optical coherence tomography

Hsu Chih Cheng, Jen-Fa Huan, Yi Cheng Liu, Chien Wen Chang, Yao Tang Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Article number075004
JournalOptical Engineering
Volume48
Issue number7
DOIs
Publication statusPublished - 2009 Dec 1

Fingerprint

Group delay
Optical tomography
tomography
Diffraction gratings
gratings (spectra)
illuminating
Light sources
signal processing
Laser pulses
acquisition
Signal processing
light sources
Diodes
diodes
gratings
broadband
Wavelength
sensitivity
pulses
wavelengths

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

Cheng, Hsu Chih ; Huan, Jen-Fa ; Liu, Yi Cheng ; Chang, Chien Wen ; Chang, Yao Tang. / Group-delay-based phase-shifting method for Fourier domain optical coherence tomography. In: Optical Engineering. 2009 ; Vol. 48, No. 7.
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Group-delay-based phase-shifting method for Fourier domain optical coherence tomography. / Cheng, Hsu Chih; Huan, Jen-Fa; Liu, Yi Cheng; Chang, Chien Wen; Chang, Yao Tang.

In: Optical Engineering, Vol. 48, No. 7, 075004, 01.12.2009.

Research output: Contribution to journalArticle

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AU - Chang, Chien Wen

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