论文部分内容阅读
提出并分析验证了一种由光场往返调制实现的光域双环路光电振荡器(OEO)。系统中光信号往返两次通过马赫-曾德尔调制器(MZM)后再进行反馈调制,使得环路中的光纤延时利用率加倍,并构成两个不同环长的光学环路。理论上对该结构的起振条件和双环选模原理进行了分析,经过与传统单环光电振荡器实验对比,此结构能有效提高边模抑制比,所测得的边模抑制比为48.33dB,在频偏10kHz时的单边带相位噪声为-97.35dBc/Hz。该结构无需增加有源器件,降低了系统中光纤的使用量,简化了实验的控制参数。信号在两个环路中循环时相向传输,进而消除了随机干涉和拍噪声引入。
An optical double-loop optical oscillator (OEO) is proposed and analyzed. The optical signal in the system passes through the Mach-Zehnder modulator (MZM) twice for feedback modulation, doubling the delay of the fiber in the loop and forming two optical loops with different ring lengths. In theory, the starting conditions of the structure and the principle of double-loop mode selection are analyzed. Compared with the conventional single-loop optical oscillator, this structure can effectively increase the side mode rejection ratio, and the measured side mode rejection ratio is 48.33dB , With a single-sideband phase noise of -97.35 dBc / Hz at a frequency offset of 10 kHz. The structure without adding active devices, reducing the amount of fiber in the system, simplifying the experimental control parameters. When the signal circulates in the two loops, it is transmitted oppositely, thus eliminating the random interference and the introduction of noise.