A scalable switched photonic link has been used to select RF local-oscillat
or (LO) signals. The LO signals transmitted by these externally modulated p
hotonic links have phase noise as low as - 145 dBc/Hz at an offset of 10 kH
z from an X-band signal, The optoelectronic switch selects among different
LO inputs with an isolation of better than 80 dB. This performance is suita
ble for many radar and communications applications.