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Wavelength-tunable erbium-doped fiber laser based on chirped fiber Bragg grating for stretch sensing applications

WEI HE1,2, YANTAO LIU3,* , ZHANG LUO1,2, XINYI CHEN1,4, GUOQING HU1,2, CHAOJIE ZHU3, LIANQING ZHU1,2,*

Affiliation

  1. Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science and Technology University, Beijing 100192, P. R. China
  2. Beijing Laboratory of Optical Fiber Sensing and Systems, Beijing Information Science and Technology University, Beijing 100192, P. R. China
  3. Beijing Institute of Structure and Environment Engineering, Beijing 100076, P. R. China
  4. eijing Laboratory of Optical Fiber Sensing and Systems, Beijing Information Science and Technology University, Beijing 100192, P. R. China

Abstract

In this study, a linear cavity erbium-doped fiber laser (EDFL) incorporated with a chirped fiber Bragg grating (CFBG) and a Mach–Zehnder interferometer (MZI) for stretch sensing was proposed and demonstrated experimentally. For the designed fiber laser, the dual-stage MZI comprises two 2×2 3-dB optical couplers, with the comb interference period of 0.56 nm. The two reflection ends of the EDFL cavity constitute a CFBG with 99.96% reflectivity and the dual-stage MZI; the laser threshold is 42 mW, and 1555.73-nm single-wavelength lasing was generated. When the pump power was 150 mW, the laser signal-to-noise ratio (SNR) was 35.792 dB and the 3-dB linewidth was 0.09 nm. In the experiment, the CFBG was installed on the adjustable bracket, and the single-wavelength lasing was tuned within the range of 1555.82–1561.35 nm as the CFBG was stretched from 0 to 2.5 mm. For upload and unload stretch procedure, the lasing sensitivity was 2.19 nm/mm, linearity was 0.999, and power shifts were less than 0.138 and 0.176 dB. For lasing stability of 1559.05 and 1555.81 nm, the power fluctuation was less than 0.205 and 0.576 dB, respectively, within 10 min of monitoring time. By adjusting the polarization controller, 1555.74- and 1555.924-nm dual-wavelength lasing was realized, the SNR was more than 40.9 dB, and the peak power difference was 2.38 dB.

Keywords

Erbium-doped fiber laser, Mach–Zehnder interferometer, Chirped fiber Bragg grating, Stretch sensing.

Citation

WEI HE, YANTAO LIU, ZHANG LUO, XINYI CHEN, GUOQING HU, CHAOJIE ZHU, LIANQING ZHU, Wavelength-tunable erbium-doped fiber laser based on chirped fiber Bragg grating for stretch sensing applications, Optoelectronics and Advanced Materials - Rapid Communications, 16, 9-10, September-October 2022, pp.391-396 (2022).

Submitted at: May 20, 2022

Accepted at: Oct. 5, 2022