Nonlinear optics of fibre event horizons

Karen E. Webb, Miro Erkintalo (), Yiqing Xu, Neil G. R. Broderick, John M. Dudley, Goëry Genty and Stuart G. Murdoch
Additional contact information
Karen E. Webb: University of Auckland, Private Bag 92019
Miro Erkintalo: University of Auckland, Private Bag 92019
Yiqing Xu: University of Auckland, Private Bag 92019
Neil G. R. Broderick: University of Auckland, Private Bag 92019
John M. Dudley: Université de Franche-Comté, Institut FEMTO-ST, CNRS UMR 6174
Goëry Genty: Optics Laboratory, Tampere University of Technology, PO Box 692
Stuart G. Murdoch: University of Auckland, Private Bag 92019

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The nonlinear interaction of light in an optical fibre can mimic the physics at an event horizon. This analogue arises when a weak probe wave is unable to pass through an intense soliton, despite propagating at a different velocity. To date, these dynamics have been described in the time domain in terms of a soliton-induced refractive index barrier that modifies the velocity of the probe. Here we complete the physical description of fibre-optic event horizons by presenting a full frequency-domain description in terms of cascaded four-wave mixing between discrete single-frequency fields, and experimentally demonstrate signature frequency shifts using continuous wave lasers. Our description is confirmed by the remarkable agreement with experiments performed in the continuum limit, reached using ultrafast lasers. We anticipate that clarifying the description of fibre event horizons will significantly impact on the description of horizon dynamics and soliton interactions in photonics and other systems.

Date: 2014
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DOI: 10.1038/ncomms5969

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