All Optical Fiber Sensor Based on Asymmetric Staggered Taper and Optical Fiber Bitaper Structure

• Published in: IEEE photonics technology letters 2023-09, Vol.35 (18), p.1-1
• Main Authors: Tong, Chengguo, Yuan, Cheng, Meng, Wentao, Pan, Qiuhong, Ma, Haiqin, Sun, Haoen, Zheng, Jiateng, Zhang, Tao, Fan, Yaxian, Yuan, Libo, Geng, Tao
• Format: Article
• Language: English
• Subjects: Asymmetry; Controllability; Fiber optics; Fiber taper; Multimode fiber; Optical fiber communication; Optical fiber sensor; Optical fiber sensors; Optical fibers; Process parameters; Resonance; Sensitivity; Sensors; Strain; Tapering; Temperature and strain measurement; Temperature measurement; Temperature sensors
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2023.3289510

A composite interferometric all-fiber sensor based on an asymmetric misaligned tapered multimode (ASTM) fiber configuration has been designed and investigated. This optical fiber sensor combines the asymmetric staggered taper (AST) structure, single-mode multimode single-mode (SMS) optical fiber and optical fiber bitaper (OFB) structure during preparation. The ASTM-OFB allows for efficient measuring of strains and temperature changes compared to conventional SMS fiber optic architecture. The experimental measurement results show that this new ASTM-OFB fiber optic sensor has two obvious resonance peaks near 1500 nm and 1580 nm, and its strain sensitivity is -37.85 pm/με and -71.92 pm/με respectively, which is about 42 times higher than that of the conventional SMS sensor; the temperature sensitivities in the two resonance peaks are 25.23 pm/°C and 26.47 pm/°C separately. The ASTM-OFB fiber optic sensors measure strain and temperature changes simultaneously with a temperature-strain crosstalk sensitivity of only 0.36 με/°C; its ASTM and OFB structures are prepared by common optical fiber fusion splicing mechanism, with a simple structure, controllable processing parameters and cost-effective.