ON THE RELATIONSHIP BETWEEN CHROMATIC DISPERSION AND TRANSMITTER FILTER RESPONSE IN DUOBINARY OPTICAL COMMUNICATION-SYSTEMS

It is shown through numerical simulation that limiting the spectral oc cupancy of a duobinary optical signal, which can be achieved by an app ropriate choice of electrical transmitter filter response, is necessar y in order to receive a benefit from duobinary transmission in single- mode optical communication systems. It is explained why such band limi ting gives an improvement in dispersion immunity, and why ideal duobin ary signaling is ineffective. The results are in good agreement with p ublished experimental work.