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Opt Lett. 2010 May 15;35(10):1503-5. doi: 10.1364/OL.35.001503.

High-resolution DPP-BOTDA over 50 km LEAF using return-to-zero coded pulses.

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  • 1Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, Ontario K1N6N5, Canada.


Coded optical probe pulses in return-to-zero/non-return-to-zero (RZ/NRZ) formats are used for long-range distance sensing based on a differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA) in order to enhance the spatial resolution and measurement accuracy. It is found that using the RZ format maintains the Brillouin spectral shape, enhances the sensing range and leads to a higher signal-to-noise ratio compared to a single-pulse Brillouin optical time-domain analysis. With 512 bit RZ-coded pulse pairs of 60/55 ns for the DPP-BOTDA, a spatial resolution of approximately 0.5 m and a strain resolution of 12 microepsilon (which is equivalent to a 0.7 MHz Brillouin frequency shift) have been achieved over a 50 km large effective area fiber.

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