An SiGe bipolar IC for directly driving a differential electroabsorpri
on modulator in a 40Gbit/s fibre optic TDM system is presented. An adj
ustable modulator bias voltage (0 to -2V) is generated on-chip by a no
vel active network in the output stage. Clear eye diagrams at 40Gbit/s
and output swings up to 2.5V(pp) (nominal 2V(pp)) were measured on mo
unted chips.