We derive an approximate solution to the nonlinear Schrödinger equation which includes the effects of fiber gratings or 3 narrow-band spectral features. Our approach allows rapid estimation of grating enhancements from a single waveguide-only simulation.|We derive an approximate solution to the nonlinear Schrödinger equation which includes the effects of fiber gratings or 3 narrow-band spectral features. Our approach allows rapid estimation of grating enhancements from a single waveguide-only simulation.

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