Application of MZI Symmetrical Structure With Fiber Balls and Seven-Core Fiber in Microdisplacement Measurement
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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/°C and 89.72 pm/°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.
KeywordsMicrodisplacement Mach-Zehnder interferometer fiber ball symmetrical structure seven-core fiber
This work was supported by the Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT_16R07), the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (Grant No. IDHT20170510), the 111 Project (Grant No. D17021), and Research Project of Beijing Education Committee (Grant No. Reseach on all-in-fiber integrated MZI sensor fabricated by CO2 laser).
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