Abstract

In this paper we report studies on the dynamical behaviors of erbium-doped fiber lasers with one polarized mode. The chaotic behaviors, as well as the coexistent scenario of the period doubling and the intermittently chaotic routes to chaos, are observed experimentally in this fiber laser with pump modulation. Optical bistability and a simple bifurcation are also observed in different modulation frequencies. A simple theoretical model has been developed to obtain almost all the dynamical behaviors. Another method to gain chaos in an erbium-doped fiber-ring laser system is a coupled-ring system. Theoretical study shows that chaos occurs in this dual-ring system. Again a bifurcation scenario is found in the marginal region from self-pulsation to chaos. Interestingly enough, a duplicated ring can produce synchronized chaos.

© 1998 Optical Society of America

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