We report the observation of strong nonreciprocal soliton amplification mediated by a Raman-scattering-like effect in single isolated collisions. A pump soliton is found to lose the greater part of its energy to a signal soliton, irrespective of the pump-signal relative amplitude. The result is an efficient rectifying mechanism able to accumulate energy into extreme waves. Experiments are carried out through photorefractive soliton two-wave mixing with a gain coefficient of up to 80 cm-1 that emerges in conditions of nonlinear response, leading to the formation of rogue waves.
Bibliographical noteFunding Information:
We acknowledge support from the Lazio Innova 2018 Project (No. F83G17000850007), Sapienza-Ricerca di Ateneo 2017 and 2018 Projects (No. RM11715C3FA0E680, No. RG1181643688C4C1), the H2020 Fet project PhoQus, the Doctoral Foundation of Tianjin Normal University (Grant No. 135202XB1607), and the Research and Visiting Abroad Project for Young Scholars of Tianjin Normal University 2015-2020.
© 2019 American Physical Society.