Influence of modulation instability on the operation of phase-sensitive optical time domain reflectometersстатья
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Дата последнего поиска статьи во внешних источниках: 2 декабря 2016 г.
Аннотация:Modulation instability (MI) in optical fibers adversely affects performance of phase-sensitive optical time domain reflectometers causing reduction of statistical visibility of the coherent reflectograms and corresponding degradation of the phase sensitive signal. This effect limits intensity of the probing pulse and imposes limits on the reflectometer operational range. Intensity limits imposed by the MI development were quantified for different positive dispersion fibers using nearly rectangular ~200 ns pulses at 1.5 μm wavelengths. MI development and reversible character of energy exchange between narrowband probing pulse and wideband optical noise known as Fermi–Pasta–Ulam energy recursion were observed. It is demonstrated both experimentally and numerically that the operational range of coherent reflectometers can be extended by increasing probing pulse energy if negative (normal) dispersion fibers are used, where MI development is suppressed.