Comparison of Nyquist- and partial response signalling for digital transmission in optical fibre systems

Presents a comparison of binary and multilevel coded Nyquist transmission with raised cosine 100% roll-off equalization and of partial response transmission with duobinary code equalization for digital optical fibre systems. For comparison the maximum repeater spacing and the sensitivity of the system to phase jitter are evaluated. The improvement which is gained in the case of a bandwidth limited optical fibre system by a multi-level and by the partial response system over the binary system is shown by numerical examples for transmission at high bit rates.