Dispersion measurements in new ‘Selfoc’ fibres

Dispersion measurements in new ‘Selfoc’ fibres have been performed using a Ga Al Aslaser as light source. A strong influence of the laser/fibre coupling on the pulse response was observed. The measured pulse broadening from 0.6 ns (the half-peak power width of the laser output pulse) to 8 ns after a transmission length of 700 m is much larger than the previously reported value. Over this length the dispersion was found to increase linearly. The measured refractive index profile and that calculated from the observed dispersion are in good agreement.