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Amiranashvili, Shalva
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Tobisch, Elena
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Lighthill criterion
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nonlinear Schrödinger equation
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optical fibers
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New journal of physics : the open-access journal for physics 21 (2019), Nr. 3
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Extended criterion for the modulation instability
(
[London] : IOP,
2019
)
Amiranashvili, Shalva
;
Tobisch, Elena
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Modulation instability, following the classical Lighthill criterion, appears if nonlinearity and dispersion make opposite contributions to the wave frequency, e.g. in the framework of the one-dimensional nonlinear Schrödinger equation (NLSE). Several studies of the wave instabilities in optical fibers revealed four wave mixing instabilities that are not covered by the Lighthill criterion and require use of the generalized NLSE. We derive an extended criterion, which applies to all four wave interactions, covers arbitrary dispersion, and depends neither on the propagation equation nor on the slowly varying envelope approximation. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
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