1 July 2015 A novel optical coherent domain reflectometer with dual frequency modulation
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Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96553P (2015) https://doi.org/10.1117/12.2185269
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of
Abstract
We developed a novel optical coherent domain reflectometer (OCDR) technique with large measurement range by using of dual frequency modulation. The probe and local oscillator beams are frequency modulated independently, and the sensing position can be adjusted digitally via the time delay between the driving signals for the two modulators. Meanwhile, the frequency tuning spans of the two paths are different to enable heterodyne detection. In the demonstrational experiments, a spatial resolution of 3.9 m over a range of 24.6 km fiber was achieved with 35 MHz tunable range of the modulator, and the spatial resolution keeps a constant over the whole measurement range.
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L. Liu, L. Liu, Q. Liu, Q. Liu, X. Fan, X. Fan, L. Ma, L. Ma, J. Du, J. Du, Z. He, Z. He, } "A novel optical coherent domain reflectometer with dual frequency modulation", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96553P (1 July 2015); doi: 10.1117/12.2185269; https://doi.org/10.1117/12.2185269
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