@ARTICLE{Życzkowski_M._Pulsed_2018,
 author={Życzkowski, M. and Karol, M.},
 volume={vol. 26},
 number={No 2},
 journal={Opto-Electronics Review},
 pages={183-187},
 howpublished={online},
 year={2018},
 publisher={Polish Academy of Sciences (under the auspices of the Committee on Electronics and Telecommunication) and Association of Polish Electrical Engineers in cooperation with Military University of Technology},
 abstract={A modified optical fibre based Mach-Zehnder interferometer was applied as a sensor to detect wiretapping in long transmission optical fibre lines. The signal consisting of short pulses (around 1 ns) was launched to the input of the interferometer based on the polarization maintaining fibres and polarization elements. When the sensing line was undisturbed, detectors registered only a single pulse. The additional two side pulses appear, if the wiretapping attempt took place. For robust detection of any alarm situation we proposed two-criteria algorithm to minimize false alarm rate. Moreover, slow environmental fluctuations were continuously monitored and compensated by polarization controllers. We measured frequency characteristics of the sensor and performed a hundred wiretapping attempts, which proved high performance of the sensor.},
 type={Article},
 title={Pulsed interferometric optical fibre sensor detecting wiretapping in long transmission lines},
 URL={http://journals.pan.pl/Content/115312/PDF/main.pdf},
 keywords={Optical fibre sensors, Mach-Zehnder interferometer, Quantum sensors},
}