Affiliation:
1. Huaqiao University
2. Southern University of Science and Technology
3. Dongguan Guangda Intelligent Technology Co., Ltd.
Abstract
The phase-shifted fiber Bragg grating (FBG) plays an important role in optical communication and sensing due to its ultra-narrow 3-dB bandwidth. Here, we demonstrate the fabrication and thermal property of a high-quality (Q)-factor phase-shifted helical fiber Bragg grating (PS-HFBG). A single-mode fiber is twisted and then inscribed point-by-point with a third-order uniform FBG by a single round of laser irradiation. The grating is curved slightly into a helical shape after the torsion is released, generating a phase shift in the grating. With annealing treatment, the PS-HFBG responds very stably to temperature with a linear sensitivity of 15.24 pm/°C within the range from 100 to 1100°C. Moreover, the PS-HFBG peak tends to narrower for higher temperature and the minimum 3-dB bandwidth is as low as 32 pm, indicating the highest Q-factor of 4.91 × 104. In addition, the PS-HFBG shows a low strain sensitivity (0.896 pm/
μ
ε
). The proposed device is very promising to be applied as a high-precision and stable high-temperature sensor.
Funder
National Natural Science Foundation of China
the Promotion Program for Young and Middle-aged Teacher in Science Technology Research of Huaqiao University
Dongguan Introduction Program of Leading Innovative and Entrepreneurial Talents
Subject
Atomic and Molecular Physics, and Optics
Cited by
4 articles.
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