Tunable DC-60 GHz RF Generation Utilizing a Dual-Loop Optoelectronic Oscillator Based on Stimulated Brillouin Scattering
Tunable DC-60 GHz RF Generation Utilizing a Dual-Loop Optoelectronic Oscillator Based on Stimulated Brillouin Scattering
复制标题
利用基于受激布里渊散射的双环光电振荡器产生可调谐 DC-60 GHz 射频
DOI：
10.1109/jlt.2015.2403073
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发表时间：
2015-07-01
影响因子：
4.7
通讯作者：
Chen, Zhangyuan
中科院分区：
文献类型：
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作者：
Peng, Huanfa;Zhang, Cheng;Chen, Zhangyuan
实验证明了基于受激布里渊散射（SBS）的双环光电振荡器（OEO）。利用两个激光器来实现 OEO 的可调谐性。一个用作信号激光器，另一个用作泵浦激光器。通过直接调谐泵浦激光器的波长，可以获得从直流到 60 GHz 的广泛可调范围，用于生成射频信号。据我们所知，这是 OEO 迄今为止实现的最宽的基频可调范围。对于长度为 2 公里和 4 公里的双环光纤，当振荡频率选择为 5、10 或 20 GHz 时，在 10 kHz 偏移下测得的单边带 (SSB) 相位噪声为 -100 dBc/Hz。当振荡频率为10 GHz时，边模抑制比(SMSR)为35 dB。与单环路配置相比，双环路配置提高了所提出的 OEO 的频率和功率稳定性。单环路和双环路配置的 1 秒平均频率波动的 Allan 方差分别为 1.2 x 10(-7) 和 4.9 x 10(-11)。此外，首次详细介绍了基于控制理论的相位噪声模型，用于评估基于SBS的双环OEO的SSB相位噪声性能。在 100 Hz 至 100 MHz 的偏移频率范围内，实验相位噪声结果与提出的相位噪声模型非常吻合。在不同的相位噪声测试中，理论和实验表明，SBS 引起的放大自发发射 (ASE) 噪声是所提出的 OEO 中超过 100 kHz 频率偏移的相位噪声的主要来源。
A dual-loop optoelectronic oscillator (OEO) based on stimulated Brillouin scattering (SBS) is experimentally demonstrated. Two lasers are utilized to realize the tunability of the OEO. One acts as the signal laser, the other is employed as the pump laser. By directly tuning the wavelength of the pump laser, a widely tunable range from dc to 60 GHz for the RF signal generation can be obtained. To the best of our knowledge, this is the widest fundamental frequency tunable range which has ever been achieved by an OEO. With dual-loop fiber lengths of 2 and 4 km, the single sideband (SSB) phase noise is measured to be -100 dBc/Hz at 10 kHz offset when the oscillation frequency is chosen as 5, 10, or 20 GHz. The side-mode suppression ratio (SMSR) is 35 dB when the oscillation frequency is 10 GHz. The stability of both frequency and power of the proposed OEO is improved with the dual-loop configuration when compared with the singleloop one. The Allan variances of the frequency fluctuation at 1-s average are 1.2 x 10(-7) and 4.9 x 10(-11) for the single-loop and dual-loop configurations, respectively. Furthermore, a phase noise model based on control theory to evaluate the SSB phase noise performance of the dual-loop OEO based on SBS is detailed for the first time. The experimental phase noise results agree well with the proposed phase noise model at an offset frequency range from 100 Hz to 100 MHz. Among different phase noise tests, the amplified spontaneous emission (ASE) noise induced by SBS is shown theoretically and experimentally to be the dominant source for the phase noise beyond 100-kHz frequency offset in the proposed OEO.