Interchannel skew in graded index multimode fibre-optic ribbon can be
reduced by forming each channel from fibre sequentially cut from the s
ame pull. A 1.25 ps/m maximum variation in optical pulse delay has bee
n measured across a 102 m long 12 fibre ribbon. These improvements ext
end the applications of multimode ribbon fibre to include low cost syn
chronous parallel transmission at 622 Mbyte/s over distances greater t
han 1 km.