Open AccessEDF ring laser using cascaded-chirped long period fiber grating for temperature measurement
Author(s) -
Koken Fukushima,
Quoc Hung Bui,
Koki Nakaya,
Manuel Guterres Soares,
Atsushi Wada,
Satoshi Tanaka,
Fumihiko Ito
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.389235
Subject(s) - optics , materials science , wavelength , grating , fiber bragg grating , oscillation (cell signaling) , laser , fiber laser , signal (programming language) , optoelectronics , physics , computer science , programming language , biology , genetics
A novel tunable erbium-doped fiber ring laser (EDFRL) using a cascaded-chirped long period fiber grating (C-CLPG) as a wavelength selection element is proposed. The oscillation wavelength is determined by the one of the spectral peaks of the C-CLPG used, and the oscillation output provides a high signal to noise (S/N) ratio detection and a highly sensitive measurement of the temperature due to its high power and narrow spectral output. In the experiment, it is confirmed that the wavelength of the output shifts in accordance with the temperature-induced spectral shift of the C-CLPG transmittance spectrum and the temperature sensitivity is obtained to be ∼-0.2 nm/°C within the wavelength range of 1567.30 ∼ 1575.78 nm. The oscillation wavelength range is to be limited depending on the fringe spacing of the channeled spectrum of C-CLPG, which limits the temperature measurement range, but a data processing approach to solve this problem is additionally proposed and its availability is also presented.