Microfiber-based inline Mach-Zehnder interferometer for dual-parameter measurement

Haipeng Luo, Qizhen Sun*, Zhilin Xu, Weihua Jia, Deming Liu, Lin Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


An approach to realizing simultaneous measurement of refractive index (RI) and temperature based on a microfiber-based dual inline Mach-Zehnder interferometer (MZI) is proposed and demonstrated. Due to different interference mechanisms, as one interference between the core mode and the lower order cladding mode in the sensing single-mode fiber and the other interference between the fundamental mode and the high-order mode in the multimode microfiber, the former interferometer achieves RI sensitivity of -23.67 nm/RIU and temperature sensitivity of 81.2 pm/oC, whereas those of the latter are 3820.23 nm/RIU, and -465.7 pm/oC, respectively. The large sensitivity differences can provide a more accurate demodulation of RI and temperature. The sensor is featured with multiparameters measurement, compact structure, high sensitivity, low cost, and easy fabrication.

Original languageEnglish
JournalIEEE Photonics Journal
Issue number2
Publication statusPublished - 16 Feb 2015

Bibliographical note

Creative Commons BY

Funding: National Natural Science Foundation of China under Grant 61275004 and Grant 61290315 and in part by the European Commission's Marie Curie International Incoming Fellowship under Grant 328263.


  • refractive index
  • Sensors
  • subwavelength structure
  • temperature


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