An opto-electronic integrated circuit (OEIC) apparatus is disclosed for generating an electrical signal at a frequency .gtoreq.10 GHz. The apparatus, formed on a single substrate, includes a semiconductor ring laser for generating a continuous train of mode-locked lasing pulses and a high-speed photodetector...http://www.google.es/patents/US5998781?utm_source=gb-gplus-sharePatente US5998781 - Apparatus for millimeter-wave signal generation
