We report, for the first time to our knowledge, the experimental obser
vation of quasi-cw nonlinear switching and multiple gap-soliton format
ion within the bandgap of a fiber Bragg grating. As many as five gap s
olitons with 100-500-ps durations were generated from a 2-ns pulse at
a launched peak intensity of approximate to 27 GW/cm(2). A correspondi
ng increase in the grating transmission from 3% to 40% of the incident
pulse energy was observed. (C) 1998 Optical Society of America.