Ms. Hui Zhang Profile

Hui Zhang

at Heilongjiang Univ

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Publications (2)

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Proceedings Article | 1 November 2021 Paper

Multimode assisted open-cavity Mach-Zehnder interferometer

Hui Zhang, Chuanxu Liu, Meng Zhang, Jiuru Yang

Proceedings Volume 12057, 120570E (2021) https://doi.org/10.1117/12.2604007

KEYWORDS: Optical microcavities, Visibility, Mach-Zehnder interferometers, Multimode fibers

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In this paper, in order to improve fabrication efficiency, a novel multimode open-cavity Mach-Zehnder interferometer (MOC-MZI) is proposed and completed based on joint-assistance of microfiber and multimode fibers (MMFs), through flame brush and arc-discharged core-offset splicing techniques, in which a sub-millimeter-long MMF is used as the expansion fiber. The light field distributions of MOC-MZI with different core diameters of MMF (denoted by d_MMF) by beam propagation method were investigated, and the effective beam expansion range was quantified with respect to the length of MMF (denoted by L_MMF). Moreover, the optimal offset value of the microfiber (denoted by α) with different waist diameters (denoted by d) was obtained by simulation. According to the simulation results, the maximum fringe visibility can reach 28.3 dB via the optimized L_MMF (=600 μm) and microfiber (d=40 μm, α=30 μm). Additionally, the energy attenuation of MOC-MZI is studied with varied cavity length, and the possible intensity-sensitive cavity length is found. Multiple open-cavity structures with different dMMF from 0 to 105 μm were then experimentally prepared and compared. When dMMF=105 μm, a millimeter-length open-cavity MZI is obtained with the visibility of ~8-dB, and its temperature response was characterized in terms of wavelength and intensity.

Proceedings Article | 1 November 2021 Paper

Intensity modulated optical liquid level sensor based on cascaded multimode-single-mode-multimode fiber structure

Jinwen Zhang, Hui Zhang, Huaicheng Zhang, Xue Zhang, Jiuru Yang

Proceedings Volume 12057, 120570F (2021) https://doi.org/10.1117/12.2604009

KEYWORDS: Liquids, Sensors, Multimode fibers, Modulation, Fiber optics sensors, Mach-Zehnder interferometers

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In this paper, a novel fiber-optic liquid level sensor is proposed and experimentally completed through a cascaded multimode-single-mode-multimode (MSM) structure with the same length of 25 mm. Two typical in-line Mach-Zehnder interferometers (MZIs) are respectively formed in each MSM structure, but more cladding modes are excited in the second MZI. A multimode-interference-like fringe then is observed, due to the mismatched energy of two MZIs. The comprehensive tests are performed in terms of liquid (water) level and temperature. The experimental results show that obvious intensity variation is demonstrated in a continuous liquid level measurement, but with a slight wavelength drift (about ±0.522 nm). The liquid level sensitivity reaches 0.261 dB/mm in the range from 0 to 40 mm with the linearity of 0.98. Inversely, the temperature response exhibits a flat wavelength shift. The wavelength sensitivity is 43.27 pm/°C and the intensity change is merely 0.01 dB/°C In the range from 24 to 58 °C. So the calculated temperature crosstalk is about 0.04 mm/°C and the measured error is compressed within 0.02%. It is obvious that, owing to such low crosstalk, our senor has the potential in high discriminative simultaneous measurement of engineering application.

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