Abstract

We develop a perturbation theory as an approximate solution to the nonlinear Helmholtz equation in a multimode waveguide to examine the transition from the low-power multimode interference solution to high-power self-guiding solution. We compare the perturbation results with those obtained from finite-difference beam-propagation simulations. The results indicate that the lowest-order linear mode evolves into the self-guided mode as the power in the input beam is increased.

© 2005 Optical Society of America

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