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提出了一种利用光学谐振腔代替长光纤作为光电振荡器系统延时器件,以提高微波品质因子的方案。此方案中,光子可以在谐振腔中多次循环传播,2英寸(1英寸=2.54 cm)的平面光波导谐振腔,最高可以使系统产生1 923.1 ns的延时、输出频谱宽度为0.52 MHz的微波信号,微波的品质因子达12 077.1,光学谐振腔的延时效果等效于388.7 m长光纤。通过在系统中加入光波导谐振腔,产生了1.2 GHz的微波信号,中心频率1.2 GHz处其相位噪声为-93 dBc/Hz@10 kHz。此方案的优势在于:使用光学谐振腔代替长光纤作为光电振荡器的延时器件时,可以减小长光纤容易受外界环境温度和应力等的影响,降低微波信号的相位噪声。
A scheme of using the optical resonator instead of the long optical fiber as the delay device of the optical oscillator system to improve the microwave quality factor is proposed. In this scheme, photons can propagate through the resonator multiple times. The 2-inch (1 inch = 2.54 cm) planar waveguide resonator can make the system produce a delay of 1 923.1 ns with an output spectral width of 0.52 MHz The quality factor of the microwave signal and the microwave is 12 077.1, and the delay of the optical resonator is equivalent to that of the 388.7 m long fiber. By adding an optical waveguide resonator to the system, a 1.2 GHz microwave signal was generated with a phase noise of -93 dBc / Hz @ 10 kHz at 1.2 GHz center frequency. The advantage of this solution is that the use of an optical resonator instead of a long optical fiber as a delay device for a photoelectric oscillator reduces the susceptibility of a long optical fiber to external ambient temperature and stress and reduces the phase noise of the microwave signal.