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