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Diagram of operation principle. (a) Arrangement of the fiber segments had different Brillouin frequency shifts (BFSs); (b) wavelengths used in BOTDA and Ф-OTDR. RS: Rayleigh scattering; BLS: Brillouin loss spectrum; BGS: Brillouin gain spectrum; (c) interleaving of the input pulses of BOTDA and Ф-OTDR.
