title: Few-mode fiber based distributed curvature sensor through quasi-single-mode Brillouin frequency shift.
abstract: We proposed and demonstrated a few-mode fiber (FMF) based optical-fiber sensor for distributed curvature measurement through quasi-single-mode Brillouin frequency shift (BFS). By central-alignment splicing FMF and single-mode fiber (SMF) with a fusion taper, a SMF-components-compatible distributed curvature sensor based on FMF is realized using the conventional Brillouin optical time-domain analysis system. The distributed BFS change induced by bending in FMF has been theoretically and experimentally investigated. The precise BFS response to the curvature along the fiber link has been calibrated. A proof-of-concept experiment is implemented to validate its effectiveness in distributed curvature measurement.
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.forename: Ruoxu
authors.initials: R
authors.lastname: Wang
authors.forename: Deming
authors.initials: D
authors.lastname: Liu
authors.forename: Songnian
authors.initials: S
authors.lastname: Fu
authors.forename: Can
authors.initials: C
authors.lastname: Zhao
authors.forename: Huifeng
authors.initials: H
authors.lastname: Wei
authors.forename: Weijun
authors.initials: W
authors.lastname: Tong
authors.forename: Perry Ping
authors.initials: PP
authors.lastname: Shum
authors.forename: Ming
authors.initials: M
authors.lastname: Tang