微环谐振调制器的调制性能研究

发布时间：2018-08-07 20:04

【摘要】：随着社会的发展和科技的进步,人们对通信网络提出了高速度和大容量的要求,光纤通信应运而生。集成光学器件不仅是光纤网络的重要组成部分,而且促进了光纤通信的发展。作为集成光学中的关键器件,光调制器是高速、长距离光通信中不可或缺的一部分。由于微环谐振调制器体积小、集成度高,功耗低,因此被广泛应用于集成光电子器件中。在分析微环谐振调制器时,传统的静态耦合模理论无法对微环谐振器的动态特性进行准确的分析,因此研究可获得精确结果、且利于计算机编程的动态分析方法十分必要。此外,设计可获得高质量调制输出信号,且调制带宽大、调制电压低的微环谐振调制器非常重要。结合这一需要,本文的主要工作如下:(1)针对分析微环谐振调制器已有方法的局限性,提出基于信号流程图的动态分析法,采用信号流程图动态分析微环谐振器的场传输模型,对时间和空间进行离散化,实现精确高效计算。(2)研究了单环谐振调制器的调制特性。利用正弦信号和高斯脉冲信号研究了单环谐振调制器在耦合强度调制、折射率调制和传输损耗调制这三种调制模式下的输出特性,并分析了调制深度。结果显示,耦合强度调制可获得极大的调制带宽和高质量的调制输出信号,折射率调制和传输损耗调制输出信号的幅度衰减较大,调制带宽受限。(3)研究了耦合强度调制模式的微环谐振调制器,包括含反馈波导的微环谐振调制器,基于MZI(Mach-Zehnder Interferometer)耦合区的微环谐振调制器。对于含反馈波导的微环谐振调制器,利用正弦信号和高斯脉冲信号,分析了反馈臂调制、微环调制和反馈臂与微环组合三种调制方式的调制输出特性和调制深度。结果显示,通过对反馈臂的折射率进行调制可以实现耦合强度调制,并增强调制效果,实现宽带调制。对于基于MZI耦合区的微环谐振调制器,在MZI的上下臂加相位环,可以增强调制效果。研究并比较了无相位环、含单个相位环、含双相位环的微环谐振调制器的调制性能,并对相位环的优化策略进行了研究。结果显示,相位环的引入能增强调制输出信号,当将相位环的工作点设置为谐振点时,会得到较大的调制深度和调制带宽,其调制性能更加优越。
[Abstract]:With the development of society and the progress of science and technology, people put forward the requirement of high speed and large capacity to the communication network, and optical fiber communication emerges as the times require. Integrated optical devices are not only an important part of fiber network, but also promote the development of optical fiber communication. As a key device in integrated optics, optical modulator is an indispensable part of high-speed and long-distance optical communication. Microloop resonant modulators are widely used in integrated optoelectronic devices due to their small size, high integration and low power consumption. In the analysis of microloop resonant modulator, the traditional static coupled mode theory can not accurately analyze the dynamic characteristics of the microloop resonator, so it is necessary to study the dynamic analysis method which can obtain accurate results and is conducive to computer programming. In addition, it is very important to design a microloop resonant modulator with high quality modulation output signal, large modulation bandwidth and low modulation voltage. According to this need, the main work of this paper is as follows: (1) aiming at the limitation of the existing methods of analyzing the microloop resonant modulator, a dynamic analysis method based on signal flowchart is proposed, and the field transmission model of microring resonator is analyzed dynamically by signal flowchart. Time and space are discretized to achieve accurate and efficient calculation. (2) the modulation characteristics of single ring resonant modulator are studied. Using sinusoidal signal and Gao Si pulse signal, the output characteristics of single ring resonant modulator in three modulation modes, i.e. coupling intensity modulation, refractive index modulation and transmission loss modulation, are studied. The modulation depth is also analyzed. The results show that the coupling intensity modulation can obtain great modulation bandwidth and high quality modulation output signal, and the amplitude attenuation of refractive index modulation and transmission loss modulation output signal is larger. Modulation bandwidth is limited. (3) the microloop resonant modulator with coupling intensity modulation mode, including microloop resonant modulator with feedback waveguide and microloop resonant modulator based on MZI (Mach-Zehnder Interferometer) coupling region, is studied. For microloop resonant modulator with feedback waveguide, the modulation output characteristics and modulation depth of feedback arm modulation, microloop modulation and combination of feedback arm and microloop are analyzed by using sinusoidal signal and Gao Si pulse signal. The results show that the coupling intensity modulation can be realized by modulating the refractive index of the feedback arm, and the modulation effect can be enhanced, and the wideband modulation can be realized. For the microloop resonant modulator based on MZI coupling region, the modulation effect can be enhanced by adding phase loop to the upper and lower arm of MZI. The modulation performance of microloop resonant modulator with no phase loop, single phase loop and dual phase loop is studied and compared, and the optimization strategy of phase loop is studied. The results show that the modulation output signal can be enhanced by the introduction of the phase loop. When the operating point of the phase loop is set to the resonant point, the modulation depth and bandwidth will be larger, and the modulation performance will be better.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN761

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