We report on our recent experiments on nonlinear switching in fibre Bragg g
ratings. Using an all-fibre source we show an increase in transmission of a
FBG from 4% to 40% at high powers. This switching is associated with the f
ormation of gap solitons inside the grating. We also demonstrate an all-opt
ical AND gate using polarization coupled gap solitons and the optical pushb
room. (C) 1998 Optical Society of America.