Spurious Suppression in Millimeter-Wave OEO With a High- $Q$ Optoelectronic Filter

A millimeter-wave optoelectronic oscillator with low phase noise and low spurs employing ultrahigh Q optoelectronic hybrid band-pass filter is proposed. The 1-MHz pass-band filter in 29.99 GHz with Q value of 30000 has been demonstrated. Based on this ultranarrow band-pass filter, a 29.99-GHz millimeter-wave signal with the spurious suppression ratio more than 83 dB is successfully generated. Besides, the single-sideband phase noise is about -113 dBc/Hz at 10-kHz offset frequency.