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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 24 — Nov. 22, 2010
  • pp: 25449–25460

Limitations of the linear Raman gain approximation in modeling broadband nonlinear propagation in optical fibers

Miro Erkintalo, Goëry Genty, Benjamin Wetzel, and John M. Dudley  »View Author Affiliations


Optics Express, Vol. 18, Issue 24, pp. 25449-25460 (2010)
http://dx.doi.org/10.1364/OE.18.025449


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Abstract

We consider the accuracy of modeling ultrashort pulse propagation and supercontinuum generation in optical fibers based on the assumption of a material Raman response that varies linearly with frequency. Numerical simulations in silica fiber using the linear Raman gain approximation are compared with simulations using the full Raman response, and differences in the spectral, temporal and stability characteristics are considered. A major finding is that for conditions typical of many experiments, although the input pulses may satisfy the criteria where the linear gain approximation is valid, the subsequent evolution and breakup of the input pulse can rapidly lead to a situation where the linear model leads to severe inaccuracies. Numerical artifacts within the linear model inducing unphysical pulse collapse are also identified.

© 2010 OSA

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5650) Nonlinear optics : Raman effect
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Nonlinear Optics

History
Original Manuscript: September 24, 2010
Revised Manuscript: November 4, 2010
Manuscript Accepted: November 4, 2010
Published: November 19, 2010

Citation
Miro Erkintalo, Goëry Genty, Benjamin Wetzel, and John M. Dudley, "Limitations of the linear Raman gain approximation in modeling broadband nonlinear propagation in optical fibers," Opt. Express 18, 25449-25460 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-24-25449


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