All-fiber Mach-Zehnder interferometers for sensing applications

Optics Express
Lecheng LiDeming Liu

Abstract

We propose and demonstrate a thinned fiber based Mach-Zehnder interferometer for multi-purpose sensing applications. The sensor head is formed by all-fiber in-line singlemode-multimode-thinned-singlemode (SMTS) fiber structure, only using the splicing method. The principle of operation relies on the effect that the thinned fiber cladding modes interference with the core mode by employing a multimode fiber as a mode coupler. Experimental results showed that the liquid refractive index information can be simultaneously provided from measuring the sensitivity of the liquid level. A 9.00 mm long thinned fiber sensor at a wavelength of 1538.7228 nm exhibits a water level sensitivity of -175.8 pm/mm, and refractive index sensitivity as high as -1868.42 (pm/mm)/RIU, respectively. The measuring method is novel, for the first time to our knowledge. In addition, it also demonstrates that by monitoring the wavelength shift, the sensor at a wavelength of 1566.4785 nm exhibits a refractive index sensitivity of -25.2935 nm/RIU, temperature sensitivity of 0.0615 nm/°C, and axial strain sensitivity of -2.99 pm/με, respectively. Moreover, the sensor fabrication process is very simple and cost effective.

References

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Citations

Feb 12, 2013·Sensors·G A Cárdenas-SevillaJoel Villatoro
Nov 1, 2017·Optics Letters·Abhijit RoyMaruthi M Brundavanam
Aug 23, 2018·Optics Express·Yu WangSailing He
Jun 30, 2019·Scientific Reports·Xiaosheng HuangSeongwoo Yoo
May 15, 2020·Sensors·Flavio EspositoAgostino Iadicicco
Nov 13, 2015·Applied Optics·Yinping MiaoJianquan Yao
Feb 23, 2019·Sensors·Ana L HernandezMiguel Holgado
Nov 7, 2019·Optics Express·Matthew J MurrayBrandon Redding
Mar 25, 2019·Mikrochimica Acta·Dnyandeo Pawar, Sangeeta N Kale
Mar 4, 2020·Optics Express·Benoit VanusXiaoyi Bao
Mar 10, 2018·Optics Express·Lingzhen YangNigel Copner
Jan 16, 2019·Applied Optics·Zhihua ShaoQiangzhou Rong
Mar 3, 2021·The Review of Scientific Instruments·Lijun LiZhaochun Zhang

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