title: Two-axis bend measurement with Bragg gratings in multicore optical fiber.
abstract: We describe what is to our knowledge the first use of fiber Bragg gratings written into three separate cores of a multicore fiber for two-axis curvature measurement. The gratings act as independent, but isothermal, fiber strain gauges for which local curvature determines the difference in strain between cores, permitting temperature-independent bend measurement.
authors.affiliation: Department of Physics, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK. g.m.h.flockhart@hw.ac.uk
authors.forename: G M H
authors.initials: GM
authors.lastname: Flockhart
authors.forename: W N
authors.initials: WN
authors.lastname: MacPherson
authors.forename: J S
authors.initials: JS
authors.lastname: Barton
authors.forename: J D C
authors.initials: JD
authors.lastname: Jones
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: I
authors.initials: I
authors.lastname: Bennion