All-optical switching in long-period fiber gratings

Nonlinear pulse propagation in long-period fiber gratings is studied with a mode-locked $Q$-switched laser pulse approximately 80 ps in duration at a wavelength of 1.05 $\mathit{\mu }\mathrm{m}$. Optical switching, pulse reshaping, and optical limiting are found at intensities in the range of 1–20 GW$/{\mathrm{cm}}^2$.