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We investigate optimal dispersion maps for 40 Gbit/s DWDM systems based on return-to-zero differential phase-shift-keying modulated channels. Accumulating the dispersion compensation in 150 km G.652 units leads to a small transmission penalty of less than 0.5 dB.
We have experimentally demonstrated 8 times 10 Gbit/s modified duo-binary RZ (MD-RZ) signal repeaterless transmission over a record length of 240 km standard fibre (SMF-28). A Raman amplifier was used to enhance the OSNR and extend the repeaterless transmission distance with low receiver penalty.
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