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Indexed by:期刊论文

Date of Publication:2015-03-23

Journal:OPTICS EXPRESS

Included Journals:SCIE、EI、Scopus

Volume:23

Issue:6

Page Number:7602-7610

ISSN No.:1094-4087

Abstract:We present a novel dual-channel fiber optic interferometer based on intermodal interference from single-mode fiber (SMF) bending. This dual-channel interferometer has simple structure, consisting of two bare fiber semicircular bending regions with different bending radiuses connected by a section of straight fiber. A dual-channel interferometer with bending radiuses of 4 mm and 4.3mm is fabricated and refractive index (RI) sensing is realized by measuring the wavelength shift of the resonance dips in the transmission spectrum of the dual-channel interferometer. In the RI range of 1.3403 to 1.3726, the corresponding RI sensitivities for these two channels are 207 and 245nm/RIU (refractive index unit) and the RI resolutions are about 6.57 x 10(-5) RIU and 5.55 x 10(-5) RIU, respectively. (C) 2015 Optical Society of America