Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-03-23

Journal: OPTICS EXPRESS

Included Journals: Scopus、EI、SCIE

Volume: 23

Issue: 6

Page Number: 7602-7610

ISSN: 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