Mr. Xiaolong Heng Profile

Xiaolong Heng

at Nanjing University of posts and Telecommunications

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Proceedings Article | 14 February 2019 Paper

Research on sensing characteristics of cascaded tilted fiber Bragg grating

Yonglin Huang, Xiaolong Heng

Proceedings Volume 11048, 1104847 (2019) https://doi.org/10.1117/12.2522156

KEYWORDS: Fiber Bragg gratings, Refractive index, Cladding, Computer simulations, Transmittance, Modulation, Optical engineering, Temperature sensors, Sensors, Optical sensing

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In this paper, the cascade tilted fiber Bragg grating (CTFBG) is theoretically deduced through the transfer matrix method. The spectral characteristics of CTFBG with different structural parameters are simulated and analyzed in detail. The structural parameters include the tilted angle, the cascaded number and the grating period of CTFBG. The temperature and strain sensing characteristics of CTFBG are studied. When the temperature increases gradually from 10°C to 100°C, the wavelength drift of the CTFBG is 1.32 nm, and the sensitivity of the temperature is 0.0147nm/°C. Compared with tilted fiber Bragg grating (TFBG), CTFBG not only has more abundant spectral characteristics, but also has higher sensitivity than TFBG temperature sensor, which improves the sensitivity of temperature sensor. In addition, the sensitivity of the CTFBG strain sensor is also simulated. When the strain increases from 0 to 2000με , the wavelength shift of CTFBG is 2.168 nm, and the sensitivity of the strain is 0.001084 nm / με , which is slightly higher than that of TFBG strain sensor. The research results provide a theoretical basis for the application in the field of optical sensing. Therefore, it has very important research significance.

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