We demonstrate that, in the presence of noise, propagation of narrow-band 100-ns pulses through a 6-km long optical fibre sharply reduces their amplitude when a threshold power (∼0.2 W) is exceeded. The effect is due to the development of modulation instability and is sensitive to the noise level in the spectral region ∼100 GHz in width around the central frequency.
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Ismagulov et al. (2009) studied this question.
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