Fiber refractive index sensor based on dual polarized Mach-Zehnder interference caused by a single-mode fiber loop

Applied Optics
Lei ChenSong Wang

Abstract

A novel refractive index (RI) sensor head is proposed and experimentally demonstrated in this paper. The proposed sensor head is composed of a segment of bared single-mode fiber and a fiber holder that is fabricated by a 3D printer. The mechanism of the sensor head is based on dual polarized Mach-Zehnder interference. According to the aforementioned mechanism, we derived that the RI responses of the resonance dips possess an exponential functional manner when the E field is along the fast or slow axes. In addition, based on the finite element method, we found that the resonance dips wavelength responses are more sensitive when the input E field is along the fast axis. A confirmation experiment was performed, and the results confirmed our hypothesis. The maximum arithmetic mean value of RI response is about 657.895  nm/RIU for the proposed sensor head when the ambient RI changes from 1.3350 to 1.4110. Moreover, in the case of the proposed liquid RI sensor head, aligning the E field along the fast axis is the potentially needed condition for polarization.

References

Jun 16, 2015·Optics Express·Carlo Edoardo CampanellaVittorio M N Passaro
Sep 26, 2015·Applied Optics·Bárbara Rutyna HeidemannJosé Luís Fabris

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