A Curvature Sensor Based on Twisted Single-Mode-Multimode-Single-Mode Hybrid Optical Fiber Structure

作者：Tian, Ke; Xin, Yifan; Yang, Wenlei; Geng, Tao; Ren, Jing; Fan, Ya-Xian; Farrell, Gerald; Lewis, Elfed; Wang, Pengfei^*

来源：Journal of Lightwave Technology, 2017, 35(9): 1725-1731.

DOI：10.1109/JLT.2017.2650941

• Curvature sensor
• Mach-Zehnder interferometer
• multimode interference
• temperature dependence

An optical fiber curvature sensor based on a twisted multimode fiber (MMF) sandwiched between two single-mode fibers (SMF) is proposed and investigated theoretically and experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared with a traditional single-mode-multimode-single-mode fiber structure sensor, the proposed configuration offers a higher average curvature sensitivity of -2.42 nm/m(-1) over a curvature measurement range of 0-1.7390 m(-1) and -7.09 dB/m(-1) at an operating wavelength of 1537 nm. The temperature sensitivity of this sensor has been determined as 0.01 nm/degrees C over a wavelength range of 1535-1550 nm and circa 0.007 dB/degrees C at the wavelength of 1537 nm, over a measured temperature range of 21-121 degrees C.

• 出版日期2017-5-1
• 单位哈尔滨工程大学