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We demonstrate a high-performance Brillouin optical time-domain analysis (BOTDA) system with an extended sensing range by combining frequency-division multiplexing and in-line Erbium doped fiber amplifiers (EDFAs). The frequency-division multiplexing BOTDA features multiple sections of fibers with different Brillouin frequency shifts, and it reduces the effective Brillouin interaction length to one...
We propose a novel scheme to realize distributed birefringence measurement over a 500-m polarization-maintaining fiber with a 20-cm resolution based on Brillouin dynamic grating, observing three characteristic periods of the birefringence variation.
We propose a true distributed birefringence measurement of polarization-maintaining fiber based on transient Brillouin grating. A birefringence variation of 2.5 ?? 10-6 along 8 m Bow-tie fiber is measured with 20 cm spatial resolution.
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