The present invention provides a method of modeling an optical fiber
amplifier, the method being characterized in that it comprises the steps
consisting in: establishing (100) the speed equations and the
propagation equations of physical phenomena or effects involved in an
optical fiber amplifier; obtaining (112) exact analytic solutions for the
propagation equations of signals in the fiber, discretizing them, and
interpolating them along the fiber; solving (120) the previously
discretized speed equations by injecting into them solutions obtained
from the propagation equations; and delivering (130) the performance
parameters of the fiber in terms of amplification.