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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 11 — Apr. 10, 2007
  • pp: 1968–1971

Field test of a distributed fiber-optic intrusion sensor system for long perimeters

Juan C. Juarez and Henry F. Taylor  »View Author Affiliations


Applied Optics, Vol. 46, Issue 11, pp. 1968-1971 (2007)
http://dx.doi.org/10.1364/AO.46.001968


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Abstract

Field tests in desert terrain of a distributed sensor system for detecting and locating intruders based on the phase-sensitive optical-time-domain reflectometer ( ϕ - OTDR ) are described. The sensing element is a single-mode telecommunications fiber in a 4.5   mm diameter cable buried in a trench filled with loose sand. Light pulses from a continuous-wave Er:fiber Fabry–Perot laser with a narrow ( < 3   kHz ) instantaneous linewidth and low (few kilohertz per second) frequency drift are injected into one end of the fiber, and the orthogonal polarizations of the backscattered light are monitored with separate receivers. Localized phase changes in the optical carrier are sensed by subtracting a ϕ - OTDR trace from an earlier stored trace. High sensitivity and consistent detection of intruders on foot and of vehicles traveling down a road near the cable line was realized over a cable length of 8.5   km and a total fiber path of 19 km in real time.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.3510) Lasers and laser optics : Lasers, fiber
(290.5870) Scattering : Scattering, Rayleigh

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 7, 2006
Revised Manuscript: November 16, 2006
Manuscript Accepted: December 1, 2006
Published: March 20, 2007

Citation
Juan C. Juarez and Henry F. Taylor, "Field test of a distributed fiber-optic intrusion sensor system for long perimeters," Appl. Opt. 46, 1968-1971 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-11-1968

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