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Fabrication and high temperature characteristics of microtapered long period fiber gratings based on microfibers

BINGCHUAN WANG1, LIYONG REN2, XUDONG KONG3, YIPING XU4,* , KAILI REN3, WENXING YANG4, SHUBO CHENG4, YUHUI LI4, JIABAO JIANG4

Affiliation

  1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China
  2. School of Physics & Information Technology, Shaanxi Normal University, Xi’an 710119, China
  3. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
  4. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China

Abstract

Based on the photoelastic effect, a new technology is used to fabricate high quality microtapered long period fiber gratings (MLPFGs) from microfibers. The effects of different periods and number of tapers on the grating spectrum have been explored. The high temperature characteristics of the grating were studied. The results show that MLPFG fabricated from a microfiber has good high temperature stability. With the increase of temperature, the spectrum of grating with a period of 685 μm has the same change trend as that of grating with a period of 670 μm. The temperature sensing sensitivities of gratings with periods of 685 μm and 670 μm are 0.0203 nm°C-1 and 0.01741 nm°C-1, respectively. The critical temperature at which the spectrum of the fabricated MLPFG changes irreversibly is between 600°C and 800°C, which is more than 100°C higher than that reported previously. Another advantage of this type of grating is that it can be used to make torsion sensor. The measurement range is larger than that of grating directly tapered from a single mode fiber (SMF). By observing the shifts of resonant wavelengths, the torsion angle can be determined without taking other measures..

Keywords

Long period fiber grating, Microfiber, Optical fiber optics, High temperature characteristics, Torsion sensing.

Submitted at: June 3, 2021
Accepted at: Dec. 6, 2022

Citation

BINGCHUAN WANG, LIYONG REN, XUDONG KONG, YIPING XU, KAILI REN, WENXING YANG, SHUBO CHENG, YUHUI LI, JIABAO JIANG, Fabrication and high temperature characteristics of microtapered long period fiber gratings based on microfibers, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 11-12, pp. 501-508 (2022)