光电振荡器结构及稳定性研究

发布时间：2018-02-24 17:13

本文关键词： 光电振荡器布拉格光栅法布里泊罗滤波器相位噪声长期稳定性压电陶瓷　出处：《浙江大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着现代光电技术的发展,光通信技术在航空航天、光纤通信、雷达探测等领域有着越来越重要的地位。光电技术的一个重要的核心器件信号源,也愈发的受到研究学者的重视。光电振荡器(Optoelectronic Oscillator)作为一种高Q值、频谱纯度高、输出信号稳定且具有低相位噪声的光电信号源,更是受到了研究者的青睐,得到了极大的发展。本文先对光电振荡器的经典单环结构进行了介绍,并对光电振荡器的工作原理进行分析,对光电振荡器的起振条件、输出响应线性化、噪声特性等方面进行了具体的分析。对现有的光电振荡器结构进行了介绍,并对其工作原理,性能的优缺点进行了分析比较。通过对光电振荡器技术的研究与分析,本文提出了一种利用光纤布拉格光栅和法布里泊罗滤波器的新型光电振荡器结构。该结构利用布拉格光栅和法布里泊罗滤波器构成光环形腔产生稳定的激光信号,减少了激光源的使用,避免了激光源带入的相对强度噪声。在该结构中采用同一法布里泊罗滤波器进行二次滤波,提高了整个系统的频谱纯度,同时减弱了温度改变对于光电振荡器输出频率的影响。实验结果测得,该结构可以输出8.97GHz的射频信号,在偏移中心频率10kHz处相位噪声达到-109dBc/Hz。信号的输出频率边模抑制比达到-50dB。并在实验室的条件下测得,整个系统运行9个小时,中心频率的漂移仅有±2ppm,有着良好的长期稳定性。最后,对光电振荡器的长期稳定性进行了比较详细分析。重点分析了环境温度改变对于光电振荡器中光纤折射率、射频滤波器的影响。对现有的对光电振荡器长期稳定性改进方法进行了分析,比较了它们之间的优势与不足之处,参照现有的压电陶瓷调节方法,提出一种利用压电陶瓷来改变光电振荡器光纤长度,进而提高光电振荡器长期稳定性的方法。
[Abstract]:With the development of modern optoelectronic technology, optical communication technology plays a more and more important role in the fields of aerospace, optical fiber communication, radar detection and so on. Optoelectronic Oscillator is a kind of optoelectronic signal source with high Q value, high spectral purity, stable output signal and low phase noise. In this paper, the classical single-ring structure of the optoelectronic oscillator is introduced, and the working principle of the optoelectronic oscillator is analyzed. The structure of the existing optoelectronic oscillator is introduced, the working principle, the advantages and disadvantages of its performance are analyzed and compared. Through the research and analysis of optoelectronic oscillator technology, In this paper, a novel optoelectronic oscillator structure using fiber Bragg grating and Fabry-Perot filter is proposed. The structure uses Bragg grating and Fabry-Perot filter to produce stable laser signal in an optical ring cavity. The use of laser source is reduced and the relative intensity noise brought in by laser source is avoided. In this structure, the same Fabry-Perot filter is used for secondary filtering, which improves the spectral purity of the whole system. At the same time, the influence of temperature change on the output frequency of the optoelectronic oscillator is reduced. The experimental results show that the structure can output 8.97GHz RF signal. At the offset center frequency of 10kHz, the phase noise reaches -109dBc / Hz. the output frequency side mode rejection ratio of the signal reaches -50dB.It has been measured under laboratory conditions that the whole system runs for 9 hours and the drift of the center frequency is only 卤2 ppms. it has good long-term stability. Finally, the long-term stability of the optoelectronic oscillator is analyzed in detail. The influence of RF filter. The existing methods to improve the long-term stability of the optoelectronic oscillator are analyzed, and the advantages and disadvantages between them are compared. This paper presents a method to improve the long-term stability of an optoelectronic oscillator by using piezoelectric ceramics to change the length of the optical fiber.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN753.2

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