Soliton refraction by an optical soliton gas

Pierre Suret, Martin Dufour, Giacomo Roberti, Gennady El, François Copie, Stephane Randoux*

*Corresponding author for this work

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We report an optical fiber experiment in which we investigate the interaction between an individual soliton and a dense soliton gas. We evidence a refraction phenomenon where the tracer soliton experiences an effective velocity change due to its interaction with the optical soliton gas. This interaction results in a significant spatial shift that is measured and compared with theoretical predictions obtained via the inverse scattering transform theory. The effective velocity change associated with the refraction phenomenon is found to be in good quantitative agreement with the results of the spectral kinetic theory of soliton gas. Our results validate the collision rate ansatz that plays a fundamental role in the kinetic theory of soliton gas and also is at the heart of generalized hydrodynamics of many-body integrable systems.
Original languageEnglish
Article numberL042002
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Research
Issue number4
Publication statusPublished - 2 Oct 2023

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