A high sensitivity refractive index sensor based on photonic crystal fibre Mach–Zehnder interferometer

Wang, Qi; Zhao, Wan‐Ming; Wang, Botao; Hu, Haifeng; Li, Jin

doi:10.1080/09500340.2017.1310314

Cited by 11 publications

(1 citation statement)

References 17 publications

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“…Among these interferometers, optical fiber Mach‐Zehnder interferometer (MZI) has gained more attention. Various structures of MZI have been proposed, including peanut‐shape structure, 17,18 waist‐broadened tapers structure, 19 core mismatched structure, 20 down‐tapers structure, 21 and structure of direct fusion of SMF and photonic crystal fiber (PCF) 22 . In addition, multi‐parameter measurement capability is a very important indicator to measure the performance of the sensor, but temperature cross‐sensitivity problems are often encountered in multi‐parameter measurement.…”

Section: Introductionmentioning

confidence: 99%

Dual parameter in‐line fiber Mach‐Zehnder interferometer based on few‐mode fiber

Wang

Liu

et al. 2020

Micro & Optical Tech Letters

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This article proposes and demonstrates an in‐line fiber Mach‐Zehnder interferometer (MZI) based on few‐mode fiber for simultaneous measurement of temperature and refractive index. The Mach‐Zehnder interferometer is fabricated by fusion splicing a section few‐mode fiber (FMF) between hollow fiber (HF) microsphere cavity and single mode fiber (SMF) sphere. Since the different sensitivity responses of the two resonance dips in the transmission spectrum, the proposed sensor can simultaneous measurement of temperature and refractive index by monitoring the wavelength shifts of the two resonance dips. The experimental results show that the temperature sensitivities are 47.7 and 43.4 pm/°C within the temperature range from 30 to 80°C, respectively (red shift). The refractive index sensitivities are −21.41 and −30.11 nm/RIU when the refractive index changes from 1.330 to 1.394 RIU, respectively (blue shift). Furthermore, this sensor has excellent advantages of high extinction ratio, cost‐effective, ease of fabrication and compact structure, which make it competitive in the field of dual‐parameter sensing applications.

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