Compensation of Phase-Uncertainty-Induced Impairments in Dispersion-Tuned Swept Laser OCT using Digital Coherent Detection

The dispersion-tuned swept laser (DTSL) is a wavelength-swept source, which can achieve fast sweep without using any mechanical tunable filter. Such fast wavelength-swept sources are highly suitable for swept-source optical coherent tomography (SS-OCT). DTSL-based SS-OCT (DTSL-OCT) can deliver a ver...

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Bibliographic Details
Published in:Journal of lightwave technology 2020-12, Vol.38 (23), p.6492-6498
Main Authors: Shirahata, Takuma, Set, Sze Y., Yamashita, Shinji
Format: Article
Language:English
Subjects:
Coherence
Coherence length
Compensation
Digital imaging
Dispersion tuning
fiber laser
Fiber lasers
Frequency modulation
Image acquisition
Laser tuning
Nonlinearity
optical coherence tomography
Optical interferometry
Point spread functions
Signal processing
swept-source
Tunable filters
Uncertainty
Vertical cavity surface emitting lasers
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Summary:The dispersion-tuned swept laser (DTSL) is a wavelength-swept source, which can achieve fast sweep without using any mechanical tunable filter. Such fast wavelength-swept sources are highly suitable for swept-source optical coherent tomography (SS-OCT). DTSL-based SS-OCT (DTSL-OCT) can deliver a very fast imaging speed, however, it suffers from a limited imaging depth due to the its limited coherence length. In this article, digital coherent detection techniques are applied to the DTSL-OCT to improve the imaging depth and axial resolution. We show that the two phase-uncertainty-induced impairments, namely, the image degeneracy and the wavelength-sweep-nonlinearity, can be compensated by signal processing on the complex interferometric signals acquired using digital coherent detector. Removal of the mirror images resulting from complex conjugate artifact enables the full-range measurement, and the wavelength-sweep-nonlinearity compensation improves the axial resolution. We experimentally demonstrated that the OPD corresponding to a 6 dB-drop in the point-spread function (PSF) peak level can be improved from 1.4 mm to 7.2 mm.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.3013104