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采用双环注入锁定的方案来实现X波段超低相噪、小杂散光电振荡器(opto-electronic oscillator,OEO).基于近似线性理论,对注入锁定双环OEO建立了新的理论解析模型,并基于该模型分析了注入信号功率对注入锁定双环OEO相噪、杂散的影响.结果表明,适当的注入功率是同时保证低相噪与小杂散的关键.搭建基于光纤延时的载波抑制相噪测量系统,采用高线性度光电探测器与低相噪微波放大器来提高系统的灵敏度,并采用双通道互相关方案来进一步降低测量系统的噪底.实现了X波段OEO的超低相噪(-125 dBc/Hz@1 kHz,-145 dBc/Hz@10 kHz)与测量系统的超高灵敏度(-130 dBc/Hz@1 kHz,-168 dBc/Hz@10 kHz),国内无相当指标报道,接近国外文献报道过的最好指标.
An ultra-low phase-noise, small-stalled opto-electronic oscillator (OEO) is realized by a double-loop injection-locked scheme.Based on the approximate linear theory, a new theoretical analytical model is established for injection locked bicyclic OEO The model analyzes the effect of injection signal power on injection-locked double-ring OEO phase noise and spurs.The results show that proper injection power is the key to ensure low phase noise and small spurious at the same time.Coupled phase noise suppression The measurement system uses a high linearity photodetector and a low phase noise microwave amplifier to improve the sensitivity of the system and uses a two-channel cross-correlation scheme to further reduce the noise floor of the measurement system. The ultra-low phase noise of the X-band OEO (- 125 dBc / Hz @ 1 kHz, -145 dBc / Hz @ 10 kHz) Very high sensitivity to measurement systems (-130 dBc / Hz @ 1 kHz, -168 dBc / Hz @ 10 kHz) Close to the best indicators reported in foreign literature.