Modulation instability at propagation of narrowband 100-ns pulses in optical fibers of various types |
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Authors: | S A Babin A E Ismagulov E V Podivilov M P Fedoruk I S Shelemba and O V Shtyrina |
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Institution: | (1) Research Center of Laser Science and Engineering and School of Computer and Communication, Hunan University, Changsha, 410082, P.R. China; |
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Abstract: | The instability of the propagation of narrowband 100-ns laser pulses in the transparency window of a single-mode fiber in
the presence of continuous broadband noise is demonstrated. The modulation instability developed due to the nonlinearity and
anomalous dispersion leads to a rapid decay of the narrowband component after passing through the fiber. The modulation-instability
threshold is shown to be sensitive to the noise level in a spectral interval of about 100 GHz near a central wavelength of
about 1.55 μm and is inversely proportional to the fiber length (varied from 1.6 to 21.0 km in the experiments). The effect
is completely eliminated owing to the application of a dispersion-shifted fiber with normal dispersion. |
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