Stabilizing an Optoelectronic Microwave Oscillator

This paper compares methods of active stabilization of an optoelectronic microwave oscillator (OEO) based on inser- tion of a source of optical group delay into an OEO loop. The per- formance of an OEO stabilized with either a high- optical cavity or an atomic cell is analyzed. We show that the elements play a role of narrow-band microwave filters improving an OEO stability. An atomic cell also allows for locking the oscillation frequency to particular atomic clock transitions. This reports a proof-of-prin- ciple experiment on an OEO stabilization using the effect of elec- tromagnetically induced transparency in a hot rubidium atomic vapor cell.

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