title: Differential measurement scheme for Brillouin optical correlation domain analysis.
abstract: We newly propose and experimentally demonstrate a differential measurement scheme for Brillouin optical correlation domain analysis, where the difference between Brillouin gain spectra constructed by a normal and a phase-modulated Brillouin pump waves are analyzed to measure local Brillouin frequencies in optical fibers. In experiments, a five-fold enhancement in the spatial resolution is obtained compared to an ordinary BOCDA system under the same modulation parameters, as a result of the improved dynamic range by the suppression of background noises.
authors.affiliation: Center for Opto-Electronic Convergence Systems, Korea Institute of Science and Technology (KIST), Seoul, South Korea.
authors.forename: Ji Ho
authors.initials: JH
authors.lastname: Jeong
authors.forename: Kwanil
authors.initials: K
authors.lastname: Lee
authors.forename: Kwang Yong
authors.initials: KY
authors.lastname: Song
authors.forename: Je-Myung
authors.initials: JM
authors.lastname: Jeong
authors.forename: Sang Bae
authors.initials: SB
authors.lastname: Lee
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers