SOLITON-SOLUTIONS IN OPTICAL-FIBER DEVICES POSSESSING PERIODICAL HIGH-GAIN PROFILES

We study the behavior of optical pulses propagating in optical fibers possessing periodical gain profiles which do not satisfy the adiabatic amplification conditions. We demonstrate that it is possible to obtai n first and higher order soliton solutions, and we predict their final asymptotic amplitudes and widths as well as some of their transient c haracteristics. These predictions agree with results of numerical simu lations and allow to describe the global behavior of optical fiber dev ices that use periodical gain profiles, such as high gain doped fiber amplifiers.