Application of MZI Symmetrical Structure With Fiber Balls and Seven-Core Fiber in Microdisplacement Measurement

作者：Zhao, Liming; Li, Hong; Song, Yanming; Dong, Mingli^*; Zhu, Lianqing^*

来源：Photonic Sensors, 2019, 9(2): 97-107.

DOI：10.1007/s13320-018-0518-5

• Microdisplacement
• Mach-Zehnder interferometer
• fiber ball
• symmetrical structure
• seven-core fiber

An optical fiber microdisplacement sensor based on symmetric Mach-Zehnder interferometer (MZI) with a seven-core fiber and two single-mode fiber balls is proposed. The rationality and manufacturing process of the MZI sensing structure are analyzed. The fabrication mechanism of the Mach-Zehnder sensor by CO2 laser is described in detail. Experimental results show that temperature sensitivities of the two dips are 98.65 pm/degrees C and 89.72 pm/degrees C, respectively. The microdisplacement sensitivities are 2017.71 pm/mm and 2457.92 pm/mm, respectively. The simultaneous measurement of temperature and microdisplacement is demonstrated based on the sensitive matrix. The proposed Mach-Zehnder interference sensor exhibits the advantages of compact structure, simple manufacturing process, and high reliability.

• 出版日期2019-6