Abstract

We present detailed experimental and numerical analyses of nonlinear all-optical switching in long-period gratings (LPGs) in ${\mathrm{As}}_2{\mathrm{Se}}_3$ chalcogenide fiber. We characterize the nonlinear propagation of picosecond pulses through the LPG and observe nonlinear switching at optical peak powers around $55\mathrm{W}$. This is 2 orders of magnitude lower than previously demonstrated in silica fibers, owing to the very strong Kerr nonlinearity in ${\mathrm{As}}_2{\mathrm{Se}}_3$ chalcogenide glass. The results are discussed in the context of applications in passively mode-locked lasers and all-optical regenerators.

© 2008 Optical Society of America

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