Abstract
A novel setup for a Double-Taper Mach-Zehnder Interferometer (DTMZI) is presented to measure axial strain and torsion. An epoxy section is added between the two tapers as a fixture to ensure torsion sensing. The modal filtering effect of the epoxy upon the interferometry response is experimentally verified. The transmission spectrum of DTMZI under strain and torsion is modelled and further analyzed through the differential accumulated phase between the beating modes.The experimental spectral observation confirms our estimate. The relationships between the spectral shifts in wavelength and applied displacements are obtained. The sensor shows a very high sensitivity against the applied strain and twists.
Highlights
F IBER optic sensors have been used in a variety of applications measuring such mechanical parameters as strain and torsion [1]
This paper demonstrates a new setup for a Double-Taper Mach-Zehnder Interferometer (DTMZI) that ables the sensor to measure the two targeted mechanical parameters: axial strain and twist
A DTMZI is configured with two in-line tapers, shown in Fig.1b, one of which is responsible for the higher-order modes (HOMs) excitation, while the other taper acts as a phase-matching component to form interferometry between the HOMs and the fundamental mode
Summary
F IBER optic sensors have been used in a variety of applications measuring such mechanical parameters as strain and torsion [1]. Examples include Multimode fibers (MMFs) [2], Fiber Bragg Gratings (FBGs) [3], Long Period Gratings (LPGs) [4], multicore fibers [5], Photonic Crystal Fibers (PCFs) [6], and in-line fiber tapers [7] are those waveguides providing such conditions Amongst all, the latter in the form of a Double-Taper Mach-Zehnder Interferometer (DTMZI) shows more promise as it can be fabricated quickly with the essential tools in hand, namely single-mode fiber (SMF) and fusion splicer [8]. Utilizing the coupled-mode theory (CMT), we studied the analytical behaviour of DTMZI under these mechanical forces and provided parameters for further modelling and simulation. The experimental results show an agreement between our modelling estimate and spectral observations
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