Microfiber-Based Inline Mach–Zehnder Interferometer for Dual-Parameter Measurement


An approach to realizing simultaneous measurement of refractive index (RI) and temperature based mostly on a microfiber-primarily based twin inline Mach–Zehnder interferometer (MZI) is proposed and demonstrated. Because of completely different interference mechanisms, collectively interference between the core mode and therefore the lower order cladding mode within the sensing single-mode fiber and the other interference between the elemental mode and also the high-order mode in the multimode microfiber, the previous interferometer achieves RI sensitivity of 23.sixty seven nm/RIU and temperature sensitivity of eighty one.two pm/oC, whereas those of the latter are 3820.twenty three nm/RIU, and 465.7 pm/oC, respectively. The giant sensitivity differences can give a a lot of accurate demodulation of RI and temperature. The sensor is featured with multiparameters measurement, compact structure, high sensitivity, low value, and straightforward fabrication.

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