The recent prediction that intermodal dispersion could affect the prop
agation of short pulses in a two-core optical fibre was confirmed expe
rimentally. A picosecond pulse at 1.548 mu m launched into one core of
a meters-long two-core fibre was found to come out of either core of
the fibre as two temporally separate pulses. By measuring the time del
ay between these two pulses, the intermodal dispersion in the fibre wa
s estimated to be 1.13 ps/m, in good agreement with theory. (C) 1997 E
lsevier Science B.V.