  In recent years, the data traffic has grown exponentially and the forecasts
indicate a huge market that could be addressed by communication infrastructure
and service providers. However, the processing capacity, space, and energy
consumption of the available technology is a serious bottleneck for the
exploitation of these markets. Chip-integrated optical communication systems
hold the promise of significantly improving these issues related to the current
technology. At the moment, the answer to the question which material is best
suited for ultrafast chip integrated communication systems is still open. In
this manuscript we report on ultrafast graphene photodetectors with a bandwidth
of more than 76 GHz well suitable for communication links faster than 100
GBit/s per channel. We extract an upper value of 7.2 ps for the timescale in
which the bolometric photoresponse in graphene is generated. The photodetectors
were fabricated on 6 inch silicon-on-insulator wafers in a semiconductor pilot
line, demonstrating the scalable fabrication of high-performance graphene based
devices.
