硅基微环谐振腔光信号处理与布里渊光纤激光器的理论和实验研究

发布时间：2018-11-06 18:01

【摘要】：随着光通信技术的日益成熟和微波射频通信技术的飞速发展，两者融合的微波光子技术受到了越来越多研究者的亲睐。由于优质的微波信号源是一切微波领域应用的基础，，以及激光器性能的提高和各种光子器件工艺的完善，光域中产生高品质的微波信号显示出了明显的优势，其中光电振荡器（OEO）具有突出的表现。本文以光电振荡器小型化为主线，分别对其中的高Q储能单元和窄线宽激光器进行了相应的研究。在高Q储能单元方面，研究了易集成的硅基微环谐振腔的光信号处理技术。在理论分析微环谐振腔基本性能的基础上，首次提出了基于串联双微环谐振腔热非线性效应的全光开关的方案，相对于单微环结构，双微环结构可以有效提高光开关消光比，最终获得了消光比为20.2dB和开关时间为微秒量级的全光开关；其次首先分析了10μm半径单微环谐振腔的延时特性，获得了15.7ps的最大延时量，在此基础上，提出了基于并联双微环谐振腔的双波长超宽带信号的方案，双环半径都为20μm，最终实现了间隔为0.84nm的双波长单极性超宽带信号，脉宽分别为33.96ps和53.19ps。采用窄线宽的布里渊光纤激光器作为OEO的起振源。在理论分析布里渊光纤激光器的基础上，首次提出了窄线宽单纵模双环布里渊光纤激光器的方案，主腔长度为100m和50m，而副光纤环配置为10m的长度，据维纳效应，可以保证激光器单模运行，由于主腔长度大于目前已报道的布里渊激光器长度（10m），那么在精细度和腔损一致的情况下，阈值减小到56mW和99mW，线宽为0.41kHz和3.23kHz。另一方面，光纤激光器的稳定性也是一个重要的指标，提出了基于保偏光纤光延时线的自动跟踪系统，实现了激光器的稳频，测得一小时内输出功率波动为6%。高阶斯托克斯波会直接影响到OEO的性能，因此在窄线宽单纵模布里渊光纤激光器的基础上，提出可调多波长双环布里渊光纤激光器的方案，对多级SBS效应进行了相应的研究。主腔长度也选为100m和50m，副光纤环长度同样配置为10m，可以保证每一阶斯托克斯波和反斯托克斯波处于单纵模运行状态，理论分析了每一阶斯托克斯波线宽之间的关系，以及影响此激光器稳定的主要因素，最终获得了间隔为0.084nm的51个多波长激光器、可调范围为30nm，且输出功率稳定。
[Abstract]:With the maturation of optical communication technology and the rapid development of microwave radio frequency communication technology, the microwave photonic technology which combines the two technologies has been favored by more and more researchers. Because the high quality microwave signal source is the foundation of all microwave applications, the improvement of laser performance and the improvement of various photonic device technology, the generation of high quality microwave signal in optical domain shows obvious advantages. Among them, the optoelectronic oscillator (OEO) has outstanding performance. In this paper, the high Q energy storage unit and the narrow linewidth laser are studied based on the miniaturization of the optoelectronic oscillator. In the aspect of high Q energy storage unit, the optical signal processing technology of silicon based micro ring resonator is studied. Based on the theoretical analysis of the basic properties of the microring resonator, an all-optical switching scheme based on the thermal nonlinear effect of the series double-microring resonator is proposed for the first time. Compared with the single-ring structure, the dual-microring structure can effectively improve the extinction ratio of the optical switch. Finally, an all-optical switch with extinction ratio of 20.2dB and switching time of microsecond is obtained. Secondly, the delay characteristics of 10 渭 m radius single microring resonator are analyzed, and the maximum delay quantity of 15.7ps is obtained. Based on this, a dual-wavelength ultra-wideband (UWB) signal scheme based on parallel double-microloop resonator is proposed. The double ring radius is 20 渭 m. Finally, bipolar unipolar UWB signals with interval of 0.84nm are realized. The pulse widths are 33.96ps and 53.19ps, respectively. A narrow linewidth Brillouin fiber laser is used as the starting source of OEO. Based on the theoretical analysis of Brillouin fiber laser, the scheme of narrow linewidth single longitudinal mode double ring Brillouin fiber laser is proposed for the first time. The main cavity length is 100 m and 50 m, while the secondary fiber ring is 10 m long. According to Wiener effect, Because the length of the main cavity is larger than the reported length of Brillouin laser (10m), the threshold value is reduced to 56mW and 99mW, and the linewidth is 0.41kHz and 3.23kHz when the fineness and cavity loss are the same. On the other hand, the stability of fiber laser is also an important index. An automatic tracking system based on polarization-maintaining optical delay line is proposed. The frequency stability of the laser is realized, and the output power fluctuation within one hour is measured to be 6. High order Stokes wave will directly affect the performance of OEO. Therefore, based on narrow linewidth single longitudinal mode Brillouin fiber laser, a scheme of adjustable multi-wavelength double-ring Brillouin fiber laser is proposed, and the multistage SBS effect is studied accordingly. The length of the main cavity is also chosen to be 100m and 50m, and the length of the secondary fiber ring is 10m, which can ensure that every Stokes wave and anti-Stokes wave are in a single longitudinal mode state. The relationship between the linewidth of each order Stokes wave is theoretically analyzed. Finally, 51 multi-wavelength lasers with an interval of 0.084nm are obtained. The adjustable range is 30 nm and the output power is stable.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN911.7;TN248

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