Refractive index sensor with asymmetrical fiber Mach–Zehnder interferometer based on concatenating single-mode abrupt taper and core-offset section

A Mach-Zehnder interferometer (MZI) built using several concatenated different structures is proposed as a refractive index sensor. This sensor is comprised of a microbubble, a section of reduced cladding fiber (RCF) and a core-offset single-mode fiber (SMF). These structures are joined together through specialized arc fusion splicing procedures. The sensor is characterised by immersing it in Cargille oil with refractive index values ranging from 1.30 to 1.39. The sensor exhibits linearity in respect to the refractive index changes, with a good sensitivity of 144.42 nm/RIU. The proposed MZI has the advantages of cost effective, repeatable fabrication, compact size and high sensitivity, which make it a promising sensor.

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Enhanced Mach-Zehnder Interferometer Multimode–Single-Mode–Multimode Fiber Optic Refractive Index Sensor Based on Surface Plasmon Resonance

10.20944/preprints202111.0544.v1 ◽

2021 ◽

Author(s):

Zahra Akbarpour ◽

Vahid Ahmadi ◽

Farzaneh Arabpour Roghabadi

Keyword(s):

Refractive Index ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

High Performance ◽

Low Cost ◽

Single Mode ◽

Zehnder Interferometer ◽

Refractive Index Sensor ◽

Mach Zehnder Interferometer

In this paper, an all-fiber Mach-Zehnder interferometer (MZI) sensor for refractive index (RI) measuring is presented, which is based on Multimode–Single-mode–Multimode (MSM) fiber. The effects of both reducing the radius of the sensing part and the surface plasmon resonance (SPR) on its efficiency are investigated. Increasing the interaction of high-order modes with external media, caused by etching the cladding layer of the single-mode fiber part, significantly improves the sensitivity. Both wavelength and intensity interrogation approaches are employed to study the Multimode–etched Single-mode–Multimode (MESM) fiber sensor. The intensity and the wavelength sensitivities for the RI measurement in the range of 1.428-1.458 are obtained as -2308.92 %/RIU and 1313.14 nm/RIU, respectively. Finally, the MESM-SPR sensor is proposed and characterized. Results exhibit high performance in the RI range of 1.333 to 1.357, in which the sensitivity of 1433 nm/RIU is achieved. The advantages like low cost, high sensitivity, and simple fabrication methods make these sensors promising devices for chemical, food industry, and biosensing applications.

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

Journal of Modern Optics ◽

10.1080/09500340.2017.1310314 ◽

2017 ◽

Vol 64 (16) ◽

pp. 1639-1647 ◽

Cited By ~ 5

Author(s):

Qi Wang ◽

Wanming Zhao ◽

Botao Wang ◽

Haifeng Hu ◽

Jin Li

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

High Sensitivity ◽

Zehnder Interferometer ◽

Refractive Index Sensor ◽

Photonic Crystal Fibre ◽

Mach Zehnder Interferometer

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Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Sensors ◽

10.3390/s19245440 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5440 ◽

Cited By ~ 2

Author(s):

Xiaopeng Han ◽

Chunyu Liu ◽

Shengxu Jiang ◽

Shuo Leng ◽

Jiuru Yang

Keyword(s):

Refractive Index ◽

Temperature Fluctuation ◽

Extinction Ratio ◽

Single Mode ◽

Zehnder Interferometer ◽

Structure Parameters ◽

Refractive Index Sensing ◽

Polarization Maintaining Fiber ◽

Polarization Maintaining ◽

Mach Zehnder Interferometer

A novel in-fiber Mach-Zehnder interferometer based on cascaded up-down-taper (UDT) structure is proposed by sandwiching a piece of polarization maintaining fiber between two single-mode fibers (SMF) and by utilizing over-fusion splicing method. The dual up tapers respectively act as fiber splitter/combiner, the down taper acts as an optical attenuator. The structure parameters are analyzed and optimized. A larger interference fringe extinction ratio ~15 dB is obtained to achieve refractive index (RI) sensing based on intensity demodulation. The experimental results show that the RI sensitivity is −310.40 dB/RIU with the linearity is improved to 0.99 in the range of 1.3164–1.3444. The corresponding resolution can reach 3.22 × 10−5 RIU, which is 6.8 times higher than wavelength demodulation. The cross sensitivity which caused by temperature fluctuation is less than 1.4 × 10−4.

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