# Universal Peregrine soliton structure in nonlinear pulse compression in optical fiber

## TL;DR

This paper provides experimental evidence that the Peregrine soliton, a specific wave structure predicted in nonlinear physics, universally appears during pulse compression in optical fibers, confirmed through detailed measurements and simulations.

## Contribution

It demonstrates the universal emergence of the Peregrine soliton in optical fiber pulse compression, supported by experimental data and numerical simulations, highlighting its robustness across parameters.

## Key findings

- Peregrine soliton observed during pulse compression
- Experimental results match numerical simulations
- Universal mechanism is highly robust

## Abstract

We present experimental evidence of the universal emergence of the Peregrine soliton predicted in the semi-classical (zero-dispersion) limit of the focusing nonlinear Schr\"{o}dinger equation [Comm. Pure Appl. Math. {\bf 66}, 678 (2012)]. Experiments studying higher-order soliton propagation in optical fiber use an optical sampling oscilloscope and frequency-resolved optical gating to characterise intensity and phase around the first point of soliton compression and the results show that the properties of the compressed pulse and background pedestal can be interpreted in terms of the Peregrine soliton. Experimental and numerical results reveal that the universal mechanism under study is highly robust and can be observed over a broad range of parameters, and experiments are in very good agreement with numerical simulations.