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Spectral compression of chirp-free optical pulses in fibers with exponentially increasing dispersion

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Abstract

We numerically demonstrate high-degree spectral compression of chirp-free optical pulses in fibers with exponentially increasing dispersion. The spectral compression factor and brightness-enhanced factor can exceed 10, and the suggested fiber is a 0.8 km dispersion exponentially increasing fiber. We find that the input pulses finally evolve into the self-similar soliton as they propagate in the fiber. The pulse chirp is generated, although the input pulse is chirp-free, and the detailed evolution of the chirp parameter is discussed. The exponentially increasing dispersion has enabled the efficient spectral compression, and some key parameters such as the initial pulse width, initial dispersion value, and dispersion exponentially increasing rate also affect the spectral compression process for the hyperbolic secant and Gaussian input pulses. Wavelength tunability and effect of third-order dispersion also are discussed. We further provide a comparison between the numerical results from the generalized nonlinear Schrödinger equation and pulse parameter equations.

© 2017 Optical Society of America

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