GaInP/GaAs HBT Laser Driver Circuit

A high performance driver circuit for direct laser modulation has been fabricated with a 50 GHz baseline HBT GaInP/GaAs technology. It can operate at bit rate up to 16 Gbit/s with a 40 mA modulation current and 800 mW power dissipation. We also show that correctly sizing transistor area is a key factor for obtaining higher bit rate.