Abstract

A wavelength division multiplexed fiber Bragg grating (FBG) sensor interrogator using an integrated unbalanced Mach–Zehnder interferometer followed by an arrayed waveguide grating on silicon-on-insulator platform is presented. The Bragg wavelength shift is determined through the phase-generated carrier demodulation technique, allowing accurate dynamic FBG interrogation. The performance of the proposed device was validated by comparing the measurements with a commercial FBG readout unit based on a spectrometer, serving as a reference. Experimental results demonstrate a dynamic strain resolution of 4.56 nε/√Hz and minimum detectable strain down to ∼0.49 με at 1-kHz bandwidth.

Chip-scale demonstration of hybrid III–V/silicon photonic integration for an FBG interrogator

Hongqiang Li, Xiangdong Ma, Beibei Cui, Youxi Wang, Cheng Zhang, Junfa Zhao, Zanyun Zhang, Chunxiao Tang, and Enbang Li
Optica 4(7) 692-700 (2017)

Miniature interrogator for multiplexed FBG strain sensors based on a thermally tunable microring resonator array

Fan Yang, Wenjia Zhang, Shuangxiang Zhao, Qingwen Liu, Jifang Tao, and Zuyuan He
Opt. Express 27(5) 6037-6046 (2019)

Fiber-MZI-based FBG sensor interrogation: comparative study with a CCD spectrometer

Bhargab Das and Vikash Chandra
Appl. Opt. 55(29) 8287-8292 (2016)

Fully integrated on-chip FBG interrogator for high-accuracy measurement of wavelengths

Zhehan Chen, Yuan Zhuang, Leixin Meng, Jiahe Zhang, Mingfeng Ge, Qing Yang, Liqiang Wang, and Wen-Fei Dong
Opt. Lett. 48(22) 5935-5938 (2023)

Silicon-microring-based interrogator for TDM-FBG sensors enabled by pulse compression

Fan Yang, Wenjia Zhang, Qingwen Liu, and Zuyuan He
Opt. Lett. 45(23) 6402-6405 (2020)