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Coherent self-heterodyne Brillouin OTDR for measurement of Brillouin frequency shift distribution in optical fibers

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4 Author(s)
Shimizu, K. ; R&D Center, NTT Telecommun. Field Syst., Ibaraki, Japan ; Horiguchi, T. ; Koyamada, Y. ; Kurashima, T.

Time domain reflectometry of spontaneously Brillouin scattered lightwaves in a single-mode optical fiber is demonstrated with a coherent self-heterodyne detection system employing a recently proposed frequency translator, a DFB laser diode, and erbium-doped fiber amplifiers. Since the probe pulse frequency is up-converted by the translator by an amount approximately equal to the Brillouin frequency shift, the self-heterodyne beat frequency can be reduced to a sufficiently low frequency in the IF band. The system enables one-end measurement of the Brillouin frequency shift distribution in optical fibers with a single way dynamic range (SWDR) of 16 dB and a frequency resolution of 5 MHz for a spatial resolution of 100 m

Published in:

Lightwave Technology, Journal of  (Volume:12 ,  Issue: 5 )

Date of Publication:

May 1994

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