Open AccessAcquisition of phase-shift fiber grating spectra with 235 femtometer spectral resolution using DFB-LD
Author(s) -
Cunguang Zhu,
Jun Chang,
Pengpeng Wang,
Wei Wei,
Sasa Zhang,
Zhi Liu,
Gang-Ding Peng
Publication year - 2013
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.21.031540
Subject(s) - optics , materials science , grating , fiber bragg grating , spectral line , wavelength , spectral resolution , laser , optical fiber , amplified spontaneous emission , fiber laser , resolution (logic) , optoelectronics , physics , astronomy , artificial intelligence , computer science
A novel method based on distributed-feedback laser diode (DFB-LD) continuous wavelength-scanning for acquiring precise spectra of phase-shift fiber gratings is presented. Compared to the traditional method, the spectral resolution retrieved by this method is only limited by the optical line-width of the light source, which can reach up to the order of femtometer and is much higher than that of high-resolution optical spectrum analyzer (generally on the order of picometer). In addition, a Signal-to-Noise Ratio (SNR) advantage can be provided owing to a much higher spectral density of DFB-LD than amplified spontaneous emission (ASE) source. Precise spectra of three phase-shift fiber grating samples have been obtained at a resolution of 23.5 femtometer.