Mechanisms of self-similar pulses generation in a normal dispersion-decreasing fiber

Abstract

Based on the principle of virtual equivalent gain, the evolution of self-similar pulses in a normal dispersion-decreasing fiber is investigated. The occurrence of wave breaking during the process under highly nonlinear conditions and the effect of its revealed four-wave mixing on the process are also analyzed. The results indicate that the pulse spectrum broadening in the initial stage is dominated by self-phase modulation while by four-wave mixing in the later stage. The more intense nonlinearity is, the faster the pulse evolution converges to the self-similarity synchronously in both the time domain and the spectrum domain.

Keywords

Wave Breaking / Fiber Amplifier / Pulse Spectrum / Pulse Chirp / Frequency Chirp

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This work has been supported by the School Key Fund of South-central University for Nationalities (No.yzz05008), and the Hubei Provincial Department of Education (No.Q20101613).