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SNR enhancement in high resolution phasesensitive OTDR systems using chirped pulse amplification concepts

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Figure

Fig. 4. Signal spectra before and after propagation through 8 meters of  SMF (input peak power of 40 W)
Fig. 5. Connectors observed in the trace from: (a) non-dispersed pulse  (FWHM of 7 ps), (b) pulse stretched, amplified (FWHM of ~1 ns) and  then re-compressed, and (c) pulse stretched and amplified (FWHM of

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