Pulse propagation in high-gain optical fiber amplifiers with normal group-velocity dispersion has been studied by self-similarity analysis of the nonlinear Schrödinger equation with gain. For an amplifier with a constant distributed gain, an exact asymptotic solution has been found that corresponds to a linearly chirped parabolic pulse that propagates self-similarly in the amplifier, subject to simple scaling rules. The evolution of an arbitrary input pulse to an asymptotic solution is associated with the development of low-amplitude wings on the parabolic pulse whose functional form has also been found by means of self-similarity analysis. These theoretical results have been confirmed with numerical simulations. A series of guidelines for the practical design of fiber amplifiers to operate in the asymptotic parabolic pulse regime has also been developed.
© 2002 Optical Society of AmericaFull Article | PDF Article
V. I. Kruglov, A. C. Peacock, J. M. Dudley, and J. D. Harvey
Opt. Lett. 25(24) 1753-1755 (2000)
Christophe Finot, Guy Millot, and John M. Dudley
Opt. Lett. 29(21) 2533-2535 (2004)
Christophe Finot, Francesca Parmigiani, Periklis Petropoulos, and David J. Richardson
Opt. Express 14(8) 3161-3170 (2006)