A M -Varlou# clnnlu dedicated tohigh apeetral In this study, various solutions are investigated for a purity # I g d trmsmllaion using fiber optlcs me prwented. low phase noise optical link at 10 MHz, 800 MHz and Three a P P~~~O n types are bVw@ated : refe" 3.5 GHz. Indirect synchronization has been chosen for *qnenV di'hibution at lo IF dislalbutlon at the two lower frequencies, and both indirect and direct synchronization have been investigated at 3.5 GHz using Tbe reeeptlon clrcdt h o@caUy qmh"d oldllntor, w,,,cb pro,,dr II good alpal fonditloning f.r hm the two types of active devices : an 1nP based bipolar photowme m&wg the aish input dpal quaty transistor (photo-HBT) [3], and an InP based HEMT close to the d e r .device [4]. The application goal for the 10 MHz link is the reference frequency distribution in a telecommunications satellite. The signal from the ultra stable quartz clystal microwave aynthnlaed mJa at 3J