Optoelectronic clock recovery circuit usingresonant tunnelling diode and uni-travelling-carrier photodiode

An optoelectronic clock recovery circuit is reported that monolithically integrates a resonant tunnelling diode and a uni-travelling-carrier photodiode. The integrated circuit extracts an electrical 11.55 GHz clock signal from 11.55 Gbit/s RZ optical data streams in a wide locking range with low power dissipation. Furthermore, the extraction of a subharmonic clock from 23.1 and 46.2 Gbit/s input data streams is also confirmed.