An all optical chopping device for shaping and reshaping comprising an all
optical AND logic gate having a first input for receiving a first optical
signal, a second input for receiving a second optical signal and at least
one output. The AND gate may be arranged to produce at least at one
output thereof an optical output signal corresponding to a portion of the
AND product of the first optical signal and the second optical signals.
The optical output signal may be narrower than at least one of the first
optical signal and the second optical signal.