Fiber laser strain sensor based on an optical phase-locked loop

Wei Jin, Yibo Zhang, Yifan Qin, Yu Zhang, Cunkai Lou, Jiaxing Gao, Shanshan Li, Zhihai Liu, Fengjun Tian, Libo Yuan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


In this Letter, we present a high-strain resolution fiber laser-based sensor (FLS) by a novel optical phase-locked loop (OPLL) interrogation technique based on a root mean square detector (RMSD). The sensor consists of a distributed feedback (DFB) fiber laser as a master laser for strain sensing and a fiber Fabry–Perot interferometer (FFPI) as a reference. The laser carrier locks to the reference by the PDH technique, and the single sideband laser working as a slave laser locks to the DFB sensing element using the OPLL technique, respectively. A strain resolution of 8.19 pε/√Hz at 1 Hz and 35.5 pε in 10 s is achieved in the demonstrational experiments. Significantly, the noise behaves a 1/f distribution below 0.2 Hz due to the very low pump power for the DFB sensor and an active thermostat testing environment. The proposed OPLL interrogation brings new thinking for the demodulation of FLS. This strain sensor based on FLS has a great performance in strain measurement and can be a powerful tool for geophysical research.

Original languageEnglish
Pages (from-to)5245-5248
Number of pages4
JournalOptics Letters
Issue number20
Publication statusPublished - Oct 2023
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Fiber laser strain sensor based on an optical phase-locked loop'. Together they form a unique fingerprint.

Cite this