title: Measurement range enlargement in Brillouin optical correlation-domain reflectometry based on double-modulation scheme.
abstract: We have demonstrated a double-modulation scheme to enlarge the measurement range of Brillouin optical correlation-domain reflectometry for fiber-optic distributed strain sensing. In this scheme, the frequency of the laser output is simultaneously modulated with two different frequencies. In the experiment, 53-cm resolution and 1.5-km measurement range were simultaneously obtained. Furthermore, 27-cm resolution and 1.5-km measurement range were also simultaneously achieved when a noise-floor compensation technique was employed.
authors.affiliation: Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku,Tokyo 113-8656, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Mizuno
authors.forename: Zuyuan
authors.initials: Z
authors.lastname: He
authors.forename: Kazuo
authors.initials: K
authors.lastname: Hotate
mesh_terms: D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D010783:Photometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D013314:Stress, Mechanical; D014159:Transducers