Abstract
A simple high-resolution refractive index (RI) and phase sensor has been demonstrated and the results numerically verified. A free space gap is employed in one arm of a Mach–Zehnder interferometer (MZI) to serve as the sensing mechanism with a physical spacing of 1.4 mm. The propagation constant of transmitted light in the MZI’s gap changes due to the small variation in the ambient RI that will further shift the optical phase of the signal. A free space optical delay line is embedded within the MZI’s other arm to set the phase reference point and compensate for variations in the optical phase difference. The ambient RI is computed by measuring the phase shift in the transmission spectrum A high-resolution sensing of 0.8 pm/%RH corresponds to phase change of 0.012°/%RH has been achieved in 1520 nm.
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Ahmad, H., Amiri, I., Zulkifli, A., Hassan, H., Safaei, R., Thambiratnam, K.: Stable dual-wavelength erbium-doped fiber laser using novel fabricated side-polished arc-shaped fiber with deposited ZnO nanoparticles. Chin. Opt. Lett. 15(1), 011403 (2017a)
Ahmad, H., Safaei, R., Rezayi, M., Amiri, I.: Novel D-shaped fiber fabrication method for saturable absorber application in the generation of ultra-short pulses. Laser Phys. Lett. 14(8), 085001 (2017b)
Amiri, I., Ali, J.: Optical quantum generation and transmission of 57–61 GHz frequency band using an optical fiber optics. J. Comput. Theor. Nanosci. 11(10), 2130–2135 (2014)
Amiri, I., Soltanian, M., Alavi, S., Ahmad, H.: Multi wavelength mode-lock soliton generation using fiber laser loop coupled to an add-drop ring resonator. Opt. Quant. Electron. 47(8), 2455–2464 (2015)
Bhatia, V., Vengsarkar, A.M.: Optical fiber long-period grating sensors. Opt. Lett. 21(9), 692–694 (1996)
Cho, T.-S., Choi, K.-S., Seo, D.-C., Kwon, I.-B., Lee, J.-R.: Novel fiber optic sensor probe with a pair of highly reflected connectors and a vessel of water absorption material for water leak detection. Sensors 12(8), 10906–10919 (2012)
Corres, J.M., Matias, I.R., Hernaez, M., Bravo, J., Arregui, F.J.: Optical fiber humidity sensors using nanostructured coatings of SiO nanoparticles. IEEE Sens. J. 8(3), 281–285 (2008)
Fuke, M.V., Vijayan, A., Kanitkar, P., Aiyer, R.: Optical humidity sensing characteristics of Ag-polyaniline nanocomposite. IEEE Sens. J. 9(6), 648–653 (2009)
Khijwania, S.K., Srinivasan, K.L., Singh, J.P.: An evanescent-wave optical fiber relative humidity sensor with enhanced sensitivity. Sens. Actuators B Chem. 104(2), 217–222 (2005)
Korenko, B., Rothhardt, M., Hartung, A., Bartelt, H.: Novel fiber-optic relative humidity sensor with thermal compensation. Sensors 12004, 1 (2015a)
Korenko, B., Rothhardt, M., Hartung, A., Bartelt, H.: Novel fiber-optic relative humidity sensor with thermal compensation. IEEE Sens. J. 15(10), 5450–5454 (2015b). doi:10.1109/JSEN.2015.2444100
Li, Y., Tong, L.: Mach–Zehnder interferometers assembled with optical microfibers or nanofibers. Opt. Lett. 33(4), 303–305 (2008)
Liao C, Wang D, He X, Yang M (2011) Twisted optical microfiber for refractive index sensing. In: 21st International conference on optical fibre sensors (OFS21). International Society for Optics and Photonics, p 77534
Lou, J., Wang, Y., Tong, L.: Microfiber optical sensors: a review. Sensors 14(4), 5823–5844 (2014)
Mathew, J., Semenova, Y., Rajan, G., Farrell, G.: Humidity sensor based on a photonic crystal fiber interferometer. Electron. Lett. 46(19), 1341–1343 (2010)
Pereira, F., Hallett, A.H.: A new double beam optical lever refractometer and the variation of the refractive index of NaCl with temperature. Rev. Sci. Instrum. 42(4), 490–493 (1971)
Polynkin, P., Polynkin, A., Peyghambarian, N., Mansuripur, M.: Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels. Opt. Lett. 30(11), 1273–1275 (2005)
Soltanian, M., Ahmad, H., Khodaie, A., Amiri, I., Ismail, M., Harun, S.: A stable dual-wavelength thulium-doped fiber laser at 1.9 μm using photonic crystal fiber. Sci. Rep. 5, 14537 (2015a)
Soltanian, M.R.K., Amiri, I.S., Alavi, S.E., Ahmad, H.: Dual-wavelength erbium-doped fiber laser to generate terahertz radiation using photonic crystal fiber. J. Lightwave Technol. 33(24), 5038–5046 (2015b)
Soltanian, M.R.K., Sharbirin, A.S., Ariannejad, M.M., Amiri, I.S., Rue, R.M.D.L., Brambilla, G., Rahman, B.M.A., Grattan, K.T.V., Ahmad, H.: Variable waist-diameter Mach–Zehnder tapered-fiber interferometer as humidity and temperature sensor. IEEE Sens. J. 16(15), 5987–5992 (2016). doi:10.1109/JSEN.2016.2573961
Sun, A., Li, Z., Wei, T., Li, Y., Cui, P.: Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film. Sens. Actuators B Chem. 142(1), 197–203 (2009)
Tian, Z., Yam, S.S., Loock, H.-P.: Refractive index sensor based on an abrupt taper Michelson interferometer in a single-mode fiber. Opt. Lett. 33(10), 1105–1107 (2008)
White, G.: Thermal expansion of reference materials: copper, silica and silicon. J. Phys. D Appl. Phys. 6(17), 2017–2078 (1973)
Wo, J., Wang, G., Cui, Y., Sun, Q., Liang, R., Shum, P.P., Liu, D.: Refractive index sensor using microfiber-based Mach–Zehnder interferometer. Opt. Lett. 37(1), 67–69 (2012)
Wu, D.K., Kuhlmey, B.T., Eggleton, B.J.: Ultrasensitive photonic crystal fiber refractive index sensor. Opt. Lett. 34(3), 322–324 (2009)
Wu, Q., Semenova, Y., Wang, P., Farrell, G.: High sensitivity SMS fiber structure based refractometer–analysis and experiment. Opt. Express 19(9), 7937–7944 (2011)
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Soltanian, M.R.K., Amiri, I.S., Ariannejad, M.M. et al. A simple humidity sensor utilizing air-gap as sensing part of the Mach–Zehnder interferometer. Opt Quant Electron 49, 308 (2017). https://doi.org/10.1007/s11082-017-1140-2
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DOI: https://doi.org/10.1007/s11082-017-1140-2