Generation of Bragg similaritons in nonlinear fiber Bragg gratings with gain

TL;DR

This paper investigates how laser pulses can be amplified in nonlinear fiber Bragg gratings with gain, showing that under certain conditions, pulses evolve into stable, quasi-parabolic Bragg similaritons due to higher-order dispersion effects.

Contribution

It demonstrates the formation of Bragg similaritons in gain-assisted nonlinear fiber Bragg gratings and highlights the stabilizing role of fourth-order dispersion.

Findings

Fourth-order dispersion stabilizes pulse propagation.

Amplified pulses can evolve into Bragg similaritons.

Higher-order dispersion influences pulse shape and stability.

Abstract

We have explored through numerical simulations the amplification of laser pulses in nonlinear fiber Bragg gratings with gain and normal dispersion. The distortion of the temporal intensity profile caused by the higher-order dispersion coefficients is examined. The stabilizing effect of fourth-order dispersion on pulse propagation is demonstrated. For some conditions, the amplified pulse shape evolves towards a Bragg similariton, a quasi-parabolic temporal profile with wave-breaking free temporal characteristics.