This paper shows the latest results research on
the optical control of a GaAs chip monolithic Voltage
Controlled Oscillator, and is an extension of previous
work realized by our group in the field of opticalmicrowave
interaction. The oscillator was originally
designed for the transmitter stage of a VSAT
communications front-end system in the 14.5 GHz band.
The possibilities of optical control of the VCO by
illumination of the PHEMT transistor are demonstrated
through measurements of the oscillation output power
and frequency. An optical control range of 8dB of
oscillation output power and up to 400MHz of oscillation
frequency has been obtained