Long-Period Fiber Grating Based on Side-Polished Optical Fiber and Its Sensing Application

Hou Chang Li, Juan Liu, Xing Dao He, Jinhui Yuan, Qiang Wu, Bin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
9 Downloads (Pure)

Abstract

A novel side-polished long-period fiber grating (LPFG) sensor was proposed and experimentally validated. Side-polished can provide a stronger evanescent field than traditional grating and bring superior sensitivity. The greater the side-polished depth, the higher the refractive index (RI) sensitivity. When d = 44,μm , the RI sensitivity reached 466.85 nm/RIU in the range of 1.3330-1.3580, which is fourfold higher than the LPFG prepared by the electric-arc discharge (EAD) method. A graphene oxide (GO) nano-film is coated on the LPFG to make it realize high sensitivity relative humidity (RH) sensing. Humidity sensitivity reached -0.193 nm/%RH in the range of 40%-80% RH. In addition, side-polished breaks the symmetry of the distribution of the cross-sectional light field, which determines the ability to achieve vector curvature measurement. It shows good sensing performance in the same/opposite bending direction as the side polished surface. When the input light polarization is 90°, the average sensitivity reaches 5.03 and -5.9 nmm-1 in the range of 0-19.67 m-1 , respectively. This strongly indicates that the fabricated sensors show high sensitivity, low-cost materials, and robust performance and break the limitations of the EDA method to prepare gratings, which have good application potential for biomedicine and the field of construction.

Original languageEnglish
Article number7001109
Number of pages9
JournalIEEE Transactions on Instrumentation and Measurement
Volume72
Early online date4 Jan 2023
DOIs
Publication statusPublished - Jan 2023

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