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In-fiber quasi-Michelson interferometer with a core–cladding-mode fiber end-face mirror

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Abstract

An in-fiber quasi-Michelson interferometer working on reflection is proposed and experimentally demonstrated. The device consists of a short section of multimode fiber (MMF) followed by a single-mode fiber (SMF) whose end face is terminated by a thick silver film. The MMF excites cladding modes into downstream SMF via the mismatched-core splicing interface. The core–cladding modes are reflected back by the silver film and recoupled to the core of lead-in SMF through the MMF. A well-defined interference pattern is obtained as the result of core–cladding mode interference. A configuration with a 40 mm pigtail SMF at a wavelength of 1528 nm exhibits a water level sensitivity of 49.8pm/mm and a liquid refractive index sensitivity of 574.6(pm/mm)/RIU (refractive index unit). In addition, the selected dip provides a considered temperature sensitivity of 61.26pm/°C and a high displacement sensitivity of 1018.6pm/mm.

© 2013 Optical Society of America

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