基于微环谐振腔结构的可重构光分插复用器的设计与仿真研究

发布时间：2018-06-20 15:36

本文选题：可重构光分插复用器 + 微环谐振腔　；参考：《兰州交通大学》2017年硕士论文

【摘要】：随着光通信技术的发展,新业务不断涌现,推动了光网络发生了根本的变化。密集波分复用光网络正向着具有光交换、光路由以及智能波长分配功能的全光网络方向发展。可重构光分插复用器(ROADM)作为全光网络中的关键节点器件,正在向波长可调谐、抑制串扰等更高性能的方向发展,逐渐成为光通信领域研究的热点。其基本组成单元微环谐振腔具有功能多、结构简单、尺寸小、灵敏度高及良好的波长选择性等优点,已被广泛用于设计制作光滤波器、光调制器、波分复用器和光开关等光通信器件。微环谐振腔为设计结构紧凑的高集成化可重构光分插复用器提供了一条新的途径,研究基于微环谐振腔结构的可重构光分插复用器对未来全光网络的发展具有重要意义。为了突破传统结构的光分插复用器在光传送骨干网上不能良好的实现低串扰、低损耗、可调谐的特性,所以本文研究了一种改进的具有优良性能的基于微环谐振腔结构的可重构光分插复用器。主要研究内容和结果如下:(1)在广泛阅读国内外文献的基础上,总结目前对可重构光分插复用器的研究存在调谐速度不够快、尺寸大、集成度不高的缺点,了解了真正实际应用的高速集成化的ROADM器件并不多。基于当今对微环谐振腔的研究成为了热点,本课题重点介绍了微环谐振腔结构的ROADM,对微环谐振腔的基本模型、工作原理、性能参数进行了分析,之后运用耦合模理论和传输矩阵法对微环谐振腔结构的ROADM的输出振幅、输出光谱、插入损耗、串扰进行了公式推导,并数值模拟分析,为后文的设计与优化奠定理论基础。(2)针对传统矩形十字波导交叉处存在串扰和散射损耗的缺点,在十字交叉处引入了锥形多模干涉原理,设计了锥形多模干涉十字交叉波导。仿真结果表明该十字波导能实现尺寸小、低串扰、低损耗的特性。利用锥形十字波导代替传统矩形波导,构建锥形单环谐振结构的ROADM模型,并模拟了其输出光谱、串扰、输出功率,仿真结果表明与传统结构的相比,该结构的输出光谱对称、谐振峰平坦、串扰几乎没有、输出功率提高了 16%。说明了采用线性锥形结构能很好的实现低损耗光传输。(3)提出了一种具有优良特性的四通道型的光分插复用器,即基于线性锥形级联四环结构的ROADM。介绍和分析了四环结构的ROADM的工作原理和基本功能,并介绍了热光调谐原理。运用FDTD算法对传统四环结构与线性锥形四环结构的ROADM特性进行分析,仿真结果表明线性锥形四环结构的ROADM具有非谐振光弱、箱型波谱响应平坦、各信道的插入损耗低和串扰小等优点,控制好加热片的加热功率,该结构能实现动态的下载不同波长信号。因此对未来集成大规模的ROADM器件设计具有重要的参考价值。
[Abstract]:With the development of optical communication technology, new services are emerging, which promote the fundamental change of optical network. Dense wavelength division multiplexing (DWDM) optical networks are developing towards all-optical networks with optical switching, optical routing and intelligent wavelength assignment. As a key node device in all optical networks, the reconfigurable optical add-in multiplexer (ROADM) is developing towards higher performance such as wavelength tunability, crosstalk suppression and so on, which has gradually become a hot topic in the field of optical communication. The micro ring resonator, which has many functions, simple structure, small size, high sensitivity and good wavelength selectivity, has been widely used in the design and manufacture of optical filters and modulators. Optical communication devices such as wavelength division multiplexer and optical switch. The microring resonator provides a new way to design a compact and highly integrated reconfigurable optical add / drop multiplexer. It is of great significance to study the reconfigurable optical add / drop multiplexer based on the micro ring resonator structure for the development of all optical networks in the future. In order to break through the characteristics of low crosstalk, low loss and tunability of traditional optical add / drop multiplexer in optical transport backbone network, So an improved reconfigurable optical add-in multiplexer with excellent performance based on the micro-ring resonator structure is studied in this paper. The main research contents and results are as follows: (1) on the basis of extensive reading of domestic and foreign literature, this paper summarizes the shortcomings of the current research on the reconfigurable optical add / drop multiplexer, such as not fast tuning speed, large size and low integration. There are not many high-speed integrated ROADM devices used in real applications. The research of micro ring resonator has become a hot topic in this paper. The basic model, working principle and performance parameters of micro ring resonator are analyzed. Then, the output amplitude, output spectrum, insertion loss and crosstalk of ROADM with micro-ring resonator structure are deduced by coupling mode theory and transfer matrix method. In order to solve the problem of crosstalk and scattering loss in the traditional rectangular cross waveguide, the conical multimode interference principle is introduced and the conical multi mode interference cross waveguide is designed. The simulation results show that the cross waveguide can achieve the characteristics of small size, low crosstalk and low loss. The ROADM model of conical single ring resonant structure is constructed by using conical cross waveguide instead of traditional rectangular waveguide. The output spectrum, crosstalk and output power of the structure are simulated. The simulation results show that the output spectrum of the structure is symmetrical compared with the traditional structure. The resonance peak is flat, the crosstalk is almost no, and the output power is increased by 16%. It is shown that the low loss optical transmission can be realized well by using linear conical structure. A four-channel optical add / drop multiplexer with excellent characteristics is proposed, that is, ROADM based on linear conical cascade four-ring structure. This paper introduces and analyzes the working principle and basic function of four ring structure ROADM, and introduces the principle of thermo-optical tuning. By using FDTD algorithm, the ROADM characteristics of the traditional four-ring structure and the linear conical four-ring structure are analyzed. The simulation results show that the ROADM with the linear conical four-ring structure has a non-resonant light weak, and the box wave spectrum response is flat. With the advantages of low insertion loss and low crosstalk of each channel, the heating power of the heating chip can be controlled well. The structure can dynamically download different wavelength signals. Therefore, it has important reference value for the future integrated large scale ROADM device design.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

【参考文献】