Stabilized Optoelectronic Oscillator With Enlarged Frequency-Drift Compensation Range

To improve the frequency-drift compensation range for the stabilized optoelectronic oscillator, a novel stabilization scheme based on the frequency conversion pair has been proposed and experimentally demonstrated. The cavity length is adjusted by controlling the phase shift of oscillation signal at relatively low frequency via frequency division and frequency multiplication. In the proof-of-concept experiment, a 10-GHz signal has been successfully generated with the phase noise about -123 dBc/Hz at 10-kHz offset frequency assisted by the external triggering. The optoelectronic resonant cavity is tuned at 5 GHz via a divide-by-2 prescaler and a frequency doubler, and the frequency compensation range can be enlarged more than three times compared with a conventional phase-locked-loop-based stabilization method. Finally, the stability of the locked optoelectronic oscillator is improved from 4.1 × 10
^-7
to 1.1 × 10
^-10
at 1000-s averaging time.