A detailed numerical study is performed of the dynamics of optical pulse compression in an additive pulse mode-locking configuration consisting of an erbium-doped fiber laser coupled to a nonlinear optical fiber. Pulse evolution is treated by the use of an extended nonlinear Schrödinger equation incorporating a gain-and-loss term in the active fiber laser and a loss term for the nonlinear fiber, which forms the nonlinear auxilliary cavity. To treat ultrashort optical pulses with durations of less than 100 fs, we have considered third-order dispersion and self-frequency shift. On the basis of extensive numerical simulations of the all-fiber coupled-cavity configuration, a stable operating range for pulse compression is identified. It is shown that a variety of less-desirable dynamical evolutions, including pulse splitting, are obtained under other operating conditions.
© 1993 Optical Society of America
Original Manuscript: July 13, 1992
Revised Manuscript: December 29, 1992
Published: July 1, 1993
T. Geisler, K. A. Shore, M. P. Soerensen, J. Mørk, J. Mark, and P. L. Christiansen, "Nonlinear fiber external cavity mode locking of erbium-doped fiber lasers," J. Opt. Soc. Am. B 10, 1166-1174 (1993)