Open AccessDispersion management up to the third order for real-time optical coherence tomography involving a phase or frequency modulator
Author(s) -
Yu-Chuan Chen,
Xingde Li
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.005968
Subject(s) - optics , optical coherence tomography , dispersion (optics) , phase modulation , polarization mode dispersion , materials science , spatial light modulator , optical fiber , electro optic modulator , lens (geology) , optical modulator , grating , physics , phase noise
We present an effective approach to manage dispersion compensation for a fiber-optic optical coherence tomography (OCT) imaging system in which an electro-optic (EO) phase modulator or an acousto-optic (AO) frequency modulator is used. To balance both the second and third order dispersion caused by the modulator, two independent optical components would be needed. The approach reported here combines a grating-lens delay line and an extra length of a single-mode optical fiber, enabling full compensation of the dispersion caused by the modulator up to the third order. Theoretical analysis of the proposed dispersion management scheme is provided. Experimental results confirmed the theoretical prediction and an optimal OCT axial resolution offered by the light source was recovered. The proposed method can potentially incorporate dynamic dispersion compensation for the sample during depth scanning.