title: A distributed fiber vibration sensor utilizing dispersion induced walk-off effect in a unidirectional Mach-Zehnder interferometer.
abstract: We propose and experimentally demonstrate a novel ultra-long range and sensitive distributed fiber vibration sensor. Only one unidirectional Mach-Zehnder interferometer (MZI) is employed in this scheme as the sensing element. In this sensor structure, we utilize chromatic dispersion-induced walk-off effect between the vibration signals sensed by two distributed feedback (DFB) lasers at different wavelengths to locate the vibration position. Vibration signals with frequencies up to 9 MHz can be detected and the spatial resolution of 31 m is achieved over 320 km of the standard single mode fiber. Monitoring multiple vibration sources can also be realized using this scheme.
authors.forename: Qingming
authors.initials: Q
authors.lastname: Chen
authors.forename: Chao
authors.initials: C
authors.lastname: Jin
authors.forename: Yuan
authors.initials: Y
authors.lastname: Bao
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Li
authors.forename: Jianping
authors.initials: J
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Lu
authors.forename: Liang
authors.initials: L
authors.lastname: Yang
authors.forename: Guifang
authors.initials: G
authors.lastname: Li
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D014160:Transducers, Pressure; D014732:Vibration