反馈型光电混合振荡器环内非线性现象的研究  

Study on the nonlinear phenomenon in the feedback type based opto-electronic hybrid oscillator

作　　者：洪俊[1] 张松华[1] 姚胜兴[1] 李祖林[1] 刘华清[1] 郭健[2] 

机构地区：[1]湖南工学院电气与信息工程学院,湖南衡阳421002 [2]东南大学毫米波国家重点实验室,江苏南京210096

出　　处：《光电子．激光》2015年第5期819-824,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61401091);湖南省教育厅科技计划(11C0377;13B158);衡阳市科技计划(2014KG62;2014KG66);湖南工学院重点学科建设资助项目

摘　　要：对反馈型光电混合振荡器建立了一种新的理论解析模型,不仅可以准确描述振荡器的功率与相噪特性,而且能够实现与Yao′s的经典近似线性模型兼容,清晰地体现非线性对增益进行压缩的物理机理。采用近似线性分析方法,综合考虑了光电调制器与微波放大器的非线性,建立了适用范围更广、精确度更高的理论解析模型,进而分析了微波放大器的非线性对振荡信号强度与相位噪声的影响。实验结果表明,本文模型均能实现对振荡信号的功率与相噪进行准确描述。此外,还分析了微波放大器有色噪声通过非线性实现上转换的物理现象,提出了"在光电振荡器(OEO)设计中让电光调制器非线性对环路增益进行压缩、保证微波放大器工作在线性区域是一种降低振荡信号近载频相噪的有效方式"的工程方法。A new theoretical analytical model for the feedback type based opto-electronic hybrid oscillator is proposed and verified by experiments. It can not only accurately characterize both the output power and phase noise of the oscillation signal,but also be compatible with Yaors classical theory model. In ad- dition, this model can reflect the nonlinear nature of the opto-electronic oscillator and owns good practical value. As for traditional models, only the nonlinearity of electro-optic modulator is considered and the mi- crowave amplifier is taken as linear device, so when the amplifier works in the nonlinear region, tradition- al models would be no longer effective. Using the quasi-linear analytical method, this new model has wi- der application fields and higher accuracy resulting from the consideration of both nonlinearities of elec- tro-optic modulator and amplifier. Based on this model, the effect of the nonlinearity of amplifier on the output power and phase noise of the oscillation signal is also analyzed. Experimental results show that this new model can be used in all kinds of gain-compression conditions. In addition, the physical phenom- enon of up-conversion of amplifierrs colored noise is analyzed and we propose that gain compression fin- ished by modulator and keeping the amplifier working in the linear region is an effective way to reduce the near-DC phase noise of OEO.

关 键 词：理论解析模型 光电振荡器(OEO) 非线性 相位噪声 

分 类 号：TN252[电子电信—物理电子学]