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Ring laser configuration studied by collective coordinates

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Abstract

A perturbed nonlinear Schrödinger equation is used to model an optical laser fiber ring for generation of femtosecond optical pulses. The ring is built from a nonlinear laser fiber joint together with a passive nonlinear fiber. We assume that the optical pulses are solitons perturbed by loss and gain. Starting from the single-soliton solution of the nonlinear Schrödinger equation, we use a collective coordinate approach to derive a Lagrangian as a function of the collective coordinates. The evolution equations for the collective coordinates emerge from the Lagrange equations, including the associated generalized forces that result from the perturbations. Remarkably good agreement is obtained between the collective coordinate approach and the full numerical simulations of the fiber ring laser.

© 1995 Optical Society of America

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