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Double-Pass In-Line Fiber Taper Mach–Zehnder Interferometer Sensor

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4 Author(s)
Yi Li ; Dept. of Phys., Univ. of Ottawa, Ottawa, ON, Canada ; Liang Chen ; Harris, E. ; Xiaoyi Bao

In this letter, a novel double-pass in-line fiber taper Mach-Zehnder interferometer (MZI) is proposed and demonstrated as a refractive index and temperature sensor. The double-pass configuration is achieved by connecting a reflecting mirror to one port of the MZI. The attenuation peaks of the double-pass MZI spectra have higher contrasts than the peaks of single-pass spectra. Using our recently proposed spectrum differential integration analyzing method, the double-pass MZI sensors' sensitivities can be made nearly twice as large as those of the single-pass MZI.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 23 )