An intrusion detection sensor based on coherent optical time domain reflector

A distributed fiber optic intrusion detection sensor is proposed, in which a nonbalanced Mach-Zehnder interferometer is used as phase demodulator, and an optical time domain reflectometer is used as a position detector. The experimental results concluded that the positioning error of ±25m can be achieved along an 8.8-km single mode fiber. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2746–2748, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25602