[18p-A35-1~10] 3.13 Optical control devices and optical fibers

2:30 PM - 2:45 PM JST(5:30 AM - 5:45 AM UTC)

[18p-A35-5] Long-distance quasi-distributed FBG sensor based on time-division multiplexing

〇Keiji Kuroda¹, Kosei Shimizu¹ (1.Kitasato Univ.)

Keywords:

Fiber Bragg grating,Heterodyne Detection,Long-distance sensing

We report time-division multiplexed interrogation of fiber Bragg gratings distributed in a single long fiber. A heterodyne detection technique is used to sensitively detect weak reflections from fiber Bragg gratings. Reflection spectra of three fiber Bragg gratings located at 14 m, 2 km, and 42 km, each with a reflectivity of 1%, are simultaneously observed with sufficient signal-to-noise ratios.