A millimeter-wave optoelectronic oscillator employing self-regenerative frequency dividing and phase-locking techniques is proposed. The frequency division of millimeter-wave signal is achieved effectively via self-regenerative frequency divider breaking the frequency limitation of commercial frequency dividers. In virtue of the frequency conversion pair, the phase-locking technique is effectively utilized to stabilize the millimeter-wave optoelectronic oscillator by a commercial analog phase shifter in relative low frequency band. Finally, a 40-GHz millimeter-wave signal is generated with the single-sideband phase noise about -116 dBc/Hz at 10-kHz frequency offset. Besides, the frequency stability of the proposed millimeter-wave optoelectronic oscillator is greatly improved from 1.2×10-6 to 2.96×10-13 at 1024-s averaging time in a lab room without any thermal control.
A novel scheme for the generation and stabilization of the millimeter-wave (mmW) signal is theoretically analyzed and experimentally demonstrated. By using the microwave photonics frequency-quadrupling technology and phase-locked optoelectronic oscillator, we generate the millimeter-wave signal with low phase noise and high stability without the frequency limitation of the electrical phase detector and the voltage-controlled microwave phase shifter. Finally, a 40-GHz mmW signal with the stability of 1.38 × 10−12 at the average time of 100 s is generated. The spurious suppression ratio reaches 97 dB, and the measured single-sideband phase noise is lower than -103 dBc/Hz at 10-kHz offset frequency.
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