T
Tae Jung Ahn
Researcher at Gwangju Institute of Science and Technology
Publications - 11
Citations - 496
Tae Jung Ahn is an academic researcher from Gwangju Institute of Science and Technology. The author has contributed to research in topics: Optical fiber & Interferometry. The author has an hindex of 9, co-authored 11 publications receiving 431 citations.
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Journal ArticleDOI
Suppression of nonlinear frequency sweep in an optical frequency-domain reflectometer by use of Hilbert transformation
TL;DR: It is shown that this compensation technique dramatically improves the spatial resolution of a conventional OFDR and can be applied to an optical frequency-domain medical imaging system to eliminate the problem of a nonlinear frequency sweep effect.
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Residual stress relaxation in the core of optical fiber by CO 2 laser irradiation
Bok Hyeon Kim,Yongwoo Park,Tae Jung Ahn,Dug Young Kim,Byoungho Lee,Yun Chur Chung,Un Chul Paek,Won-Taek Han +7 more
TL;DR: It was demonstrated that the mechanical stress was fully relaxed by CO(2) laser irradiation and that the remaining stress in the core was thermal stress that was due to a mismatch of the thermal expansion coefficients of the fiber core and cladding.
Journal ArticleDOI
Analysis of nonlinear frequency sweep in high-speed tunable laser sources using a self-homodyne measurement and Hilbert transformation
Tae Jung Ahn,Dug Young Kim +1 more
TL;DR: A novel measurement technique for characterizing nonlinear frequency sweep in high-speed tunable laser sources by using a simple self-homodyne setup and Hilbert transformation is proposed and demonstrated.
Journal ArticleDOI
Effect of CO2 laser irradiation on the refractive-index change in optical fibers.
Bok Hyeon Kim,Tae Jung Ahn,Dug Young Kim,Byeong Ha Lee,Youngjoo Chung,Un Chul Paek,Won-Taek Han +6 more
TL;DR: The Refractive-index decrease on CO2 laser irradiation was due to relaxation of the residual stress, which was formed in optical fibers during the drawing process, and the refractive- index decrease was found to increase linearly with the drawing force.
Journal ArticleDOI
Optical frequency-domain chromatic dispersion measurement method for higher-order modes in an optical fiber.
TL;DR: It is demonstrated that the chromatic dispersion of a few-mode optical fiber can be obtained directly and quantitatively as well as qualitatively in the same way as in conventional modulation phase-shift method.