Abstract

A fiber in-line Mach-Zehnder interferometer based on dual inner air-cavities for simultaneous refractive index and temperature sensing is presented. The dual inner air-cavities are fabricated by use of femtosecond laser micromachining, fusion splicing, and slightly tapering techniques. The transmission spectrum of the interferometer exhibits a number of resonance wavelength dips corresponding to different orders of cladding modes. By tracking the shift of two dip wavelengths, the changes of refractive index and temperature can be obtained by use of a matrix method. The sensitivities achieved for refractive index and temperature are 464.96 nm/RIU and 28.7 pm/°C, respectively. The device has high potential in physical, chemical, and biological measurement due to its high sensitivity, multiparameter sensing capability, and ease of fabrication.

© 2016 IEEE

Miniaturized fiber in-line Mach–Zehnder interferometer based on inner air cavity for high-temperature sensing

T. Y. Hu, Y. Wang, C. R. Liao, and D. N. Wang
Opt. Lett. 37(24) 5082-5084 (2012)

Research on simultaneous measurement of temperature and refractive index based on thin-core fiber and pokal taper

Yimei Zhong, Juan Qin, Zhengrong Tong, Weihua Zhang, Wei Huang, and Wenlin Gao
Appl. Opt. 58(8) 1955-1960 (2019)

Simultaneous measurement of temperature and refractive index using focused ion beam milled Fabry-Perot cavities in optical fiber micro-tips

Ricardo M. André, Stephen C. Warren-Smith, Martin Becker, Jan Dellith, Manfred Rothhardt, M. I. Zibaii, H. Latifi, Manuel B. Marques, Hartmut Bartelt, and Orlando Frazão
Opt. Express 24(13) 14053-14065 (2016)

Simultaneous refractive index and temperature measurements using a tapered bend-resistant fiber interferometer

Ping Lu, Jeremie Harris, Yanping Xu, Yuangang Lu, Liang Chen, and Xiaoyi Bao
Opt. Lett. 37(22) 4567-4569 (2012)

Simultaneous measurement of refractive index and temperature using multimode microfiber-based dual Mach–Zehnder interferometer

Haipeng Luo, Qizhen Sun, Zhilin Xu, Deming Liu, and Lin Zhang
Opt. Lett. 39(13) 4049-4052 (2014)