WE PROPOSE TO DESIGN A CHIP-SCALE OPTOELECTRONIC SYNTHESIZER THAT CAN GENERATE EHF-SIGNALS (30-300 GHZ) OF HIGH SPECTRAL PURITY. WE WILL DEMONSTRATE SELECTED OPTOELECTRONIC COMPONENTS USED TO FORM THE EHF-SYNTHESIZER. YEAR 1 DURING YEAR 1 WE WILL DEVELOP A MODE-LOCKED LASER TESTBED AND DEMONSTRATE THE GENERATION OF EHF-FREQUENCIES VIA THE OPTICAL HETERODYNING OF COMB-LINES. WE WILL ALSO SIMULATE THE PERFORMANCES OF OPTICAL WAVEGUIDES AND MICRORINGS DESIGNED FOR INTEGRATION WITH THE MODE-LOCKED LASER. YEAR 2 DURING YEAR 2 WE WILL ACCESS PHOTONIC INTEGRATED CIRCUIT (PIC) FOUNDRIES TO FABRICATE THE COMPONENTS DESIGNED IN YEAR 1. WE WILL CHARACTERIZE THE PIC COMPONENTS FABRICATED FOR OPTICAL FILTERING. USING PROCESS DESIGN KITS WE WILL ALSO DESIGN AND LAYOUT ADDITIONAL INTEGRATED OPTICS COMPONENTS USED FOR PULSE SHAPING. YEAR 3 DURING YEAR 3 WE WILL INSERT THE FABRICATED PIC COMPONENTS IN THE MODE-LOCKED LASER TESTBED AND DEMONSTRATE THE GENERATION OF EHF SIGNALS FROM THE MODE-LOCKED LASER. IN ADDITION WE WILL COMPLETE THE CHARACTERIZATION OF THE FABRICATED OPTOELECTRONIC COMPONENTS. USING DATA COLLECTED FROM OUR COMPONENT CHARACTERIZATION WE WILL SIMULATE THE OVERALL PERFORMANCE OF THE CHIP-SCALE OPTOELECTRONIC SYNTHESIZER