The real frequency technique applied to narrow-band MMIC multi-stage optical modulator drivers

For the recent OSSB (optical single side band) systems, modulator drivers need only a narrow bandwidth (2 GHz bandwidth at 40 GHz) to convert electric signals into optical ones. Indeed, one of the most simple ways to eliminate the periodic fading due to chromatic dispersion is to use an optical single side band signal. In accordance with this principle, this paper presents two highly linear multistage MMIC amplifiers. For the design of the matching networks, the real-frequency technique has been successfully applied to 26.5-29.5 GHz and 40.5-42.5 GHz amplifiers.