This study aims to propose and numerically analyze a weakly-coupled polarization-maintaining few-mode fiber sensor based on stimulated Brillouin scattering (SBS) for simultaneous multiple-parameter measurement.
First, a weakly-coupled double-edged-eyelid-core polarization-maintaining few-mode fiber (DEEC-PM-FMF) supporting 12 eigenmodes across the whole C + L band is designed to improve the performance of simultaneous multiple-parameter sensing by optimizing the structural parameters of the fiber. Then, the intramodal Brillouin characteristics of the designed fiber, such as Brillouin gain spectrum and Brillouin frequency shift (BFS), are analyzed. Finally, based on intramodal SBS, the performance of the temperature and strain sensing in the designed fiber are studied and discussed.
Numerical investigation shows the minimum errors for synchronized temperature and strain measurement can reach 0.25 and 5.78 µe, respectively.
This work is significant for studying intramodal SBS in the FMFs. Furthermore, the proposed weakly-coupled DEEC-PM-FMF sensor also provides a potential guide for further improving the performance of simultaneous multiple-parameter sensing.
