Highly efficient self-similar spectral compression of hyperbolic secant pulses enhanced by pre-chirping in nonlinear fibres

Abstract

The highly efficient self-similar spectral compression of pre-chirped hyperbolic secant pulses is numerically demonstrated in the nonlinear fibre with the exponentially increasing dispersion. It is found that by implementing a pre-chirping process on chirp-free pulses before spectral compression, the spectral compression factor (SCF) and the brightness enhancement factor (BEF) can be significantly improved. In a 0.8 km long nonlinear fibre with the exponentially increasing dispersion, SCF and BEF can reach 16.12 and 13.17, respectively, which are 40.31% and 6.05% higher than those of chirp-free pulses. Additionally, the proposed technique is superior in terms of SCF, BEF, and pulse quality than spectral compression in the linearly increasing dispersion profile. Further comparison is provided between simulation results of the generalized nonlinear Schrödinger equation and the pulse parameter equations.

Self-interaction of ultrashort pulses in an epsilon-near-zero nonlinear material at the telecom wavelength

“…It is well known that the interplay of the pulse's chirp with the GVD and Kerr nonlinearity plays a significant role in spectral and temporal shaping of the pulses [31,32]. We have considered different values of the chirp in input 5, −0.8 < C < +0.8, to investigate their impact on the self-interaction.…”