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Updated: Feb 17, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Two Interrogated FBG Spectral Linewidth for Strain Sensing through Correlation
Shih-Hsiang Hsu1, Kuo-Wei Chuang2, Ci-Syu Chen3
1Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. shsu@mail.ntust.edu.tw.
Abstract:
The spectral linewidth from two cross-correlated fiber Bragg gratings (FBGs) are interrogated and characterized using a delayed self-homodyne method for fiber strain sensing. This approach employs a common higher frequency resolution instead of wavelength. A sensitivity and resolution of 166 MHz/με and 50 nε were demonstrated from 4 GHz spectral linewidth characterization on the electric spectrum analyzer. A 10 nε higher resolution can be expected through random noise analyses when the spectral linewidth from two FBG correlations is reduced to 1 GHz. Moreover, the FBG spectrum is broadened during strain and experimentally shows a 0.44 pm/με sensitivity, which is mainly caused by the photo elastic effect from the fiber grating period stretch.
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