Direct optical injection locking of a monolithic self-oscillating mixe
r operating at similar to 6 GHz is reported. The mixing can be achieve
d with conversion gain and the locking provides considerable improveme
nt in carrier-to-noise ratio for both the oscillation signal and the r
esultant intermediate-frequency (IF) signal. This type of component ma
y be attractive for systems involving the fibre distribution of microw
ave reference signals.