On the soliton generation in optical fibres

Abstract

This is a comment on a recent paper by Burzlaff.His paper is devoted to the investigation of optical soliton generation for special input pulses within the framework of the non-linear Schrodinger equation.This comment demonstrates that the main result by Burzlaff, namely the threshold condition for soliton generation, may be obtained in a general form for any initial pulse with a constant phase (and its Galilei transformation).In particular, our general result includes the Burzlaff results.We note also that the formula obtained is applicable to the sine-Gordon equation with a special type of initial condition.