Journal
OPTICS LETTERS
Volume 45, Issue 15, Pages 4172-4175Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.396301
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Funding
- Fundamental Research Funds for the Central Universities
- Key projects of Natural Science Foundation of Heilongjiang Province [ZD2019H003]
- National Natural Science Foundation of China (NSFC) [11704086, U1631239, U1831115, U1931206]
- Chinese Academy of Sciences (CAS) [U1631239, U1831115, U1931206]
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We investigated and prepared a chirped long-period grating for high sensitivity bending measurement. The novel fiber structure is composed of the multimode fiber (MMF) with fixed length and gradually longer single-mode fiber using the continuous splicing method. The powerful ability of refractive index modulation in the MMF renders the miniaturization of the sensor. The total length of the sensor is 3.45 mm. Chirped period arrangement is adopted to improve the bending sensitivity. Through numerical calculation, the chirp coefficient is determined, and the clear resonance peaks are obtained using the wavelength scanning. The experimental results of several samples show that the maximum bending sensitivity is 53.68 nm/m(-1) at 0 -1.803 m(-1). With the advantages of small size and high sensitivity, the sensor is especially suitable for bending sensing with a micro-structure. (C) 2020 Optical Society of America
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