If we create such a soliton using slightly wrong power or shape, then it will adjust itself until it reaches the standard "sech" shape with the right power. Unfortunately this is achieved at the expense of some power loss, that can cause problems because it can generate another non-soliton field propagating together with the field we want. Mono-dimensional solitons are very stable: for example, if formula_15 we will generate a first order soliton anyway; if "N" is greater we'll generate a higher order soliton, but the focusing it does while propagating may cause high power peaks damaging the media.