基于重构等效啁啾技术的分布反馈式激光器设计研究及测试

发布时间：2017-12-28 23:21

本文关键词：基于重构等效啁啾技术的分布反馈式激光器设计研究及测试　出处：《南京大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着时代的快速发展,连入通信网络的终端设备在不断增长,每天传输的数据流量也都在在激增,而智慧城市、云计算与大数据、物联网、光纤入户(FTTH)等领域也都在蓬勃发展,这些都对光通信网络的带宽和传输速度提出了越来越高的要求。面对分立的光学器件体积大、功耗大等问题,光子集成技术(PIC)即将若干光器件集成在一片基片上,是未来高速率、大容量的光通信网络的重要发展方向。而半导体激光器作为光源在光通信网络中起着重要作用,所以这对激光器的性能有很高的要求,同时大部分通信网络和普通人息息相关,这就需要考虑到半导体激光器制作成本的因素。通过重构等效啁啾技术(REC)设计半导体激光器,可以提高激光器的性能,同时可以降低成本,它是通过设计采样结构,利用均匀种子光栅同样可以实现一些复杂结构光栅的性能,因为采样周期通常是微米量级精度,所以重构等效啁啾技术将纳米级别精度的工艺转化成了微米级别精度的工艺,这大大降低了对工艺的要求,从而降低了成本。本论文主要是根据重构等效啁啾技术设计了激光器,同时对半导体激光器进行了测量。第一章是本论文的绪论部分,主要介绍了光通信发展历史、光子集成技术、半导体激光器发展历史、半导体激光器分类、半导体激光器工作原理,主要是关于半导体激光器研究的一些背景。第二章是本论文半导体激光器设计研究工作的理论基础,首先介绍了耦合模理论,它是分析一维周期性结构布拉格光栅的基础,传输矩阵法通过将整个光栅看成很多小段矩阵相乘,可以对耦合模方程进行求解得到反射率和时延。然后介绍了本论文的基础重构等效啁啾技术,以及重构等效啁啾技术的延伸等效相移技术,它是在采样周期中引入相移从而等效地在不同级次的光栅中引入相移。第三章首先介绍了提高单模特性的半导体激光器设计,它主要是利用弯曲波导实现了种子光栅左右两部分的等效周期不一样,而左右两部分的采样周期也不一样,同时使用等效相移技术,这样就可以实现光栅在+1级或-1级透射波长的重合,同时零级波长变得杂乱无章,从而提高激光器的单模特性。弯曲波导可以解决制作非均匀种子光栅的工艺难度,同时也降低了制作的成本。同时利用该结构设计了多波长激光器阵列,并且研究了弯曲波导连接处的损耗和优化问题。其次是介绍了抑制空间烧孔效应的激光器设计工作,它的结构为在等效相移结构的中间一部分区域没有折射率调制,通过仿真我们发现这种结构的中间区域光场分布没有十分聚集,这从而可以达到抑制空间烧孔效应。第四章介绍了激光器的测量工作和测量系统的搭建,主要测量了串联可调谐激光器的光谱、弯曲波导激光器测试、基于REC技术设计的DFB激光器芯片无杂散动态范围(SFDR)和眼图的测量。本论文的创新点主要有：第一,利用重构等效啁啾技术和弯曲波导设计了光栅左右两部分等效种子光栅周期不一样、采样周期不一样的结构,从而实现了提高激光器的单模特性；第二,利用重构等效啁啾技术设计了中间区域没有光栅的新型半导体激光器,从而实现了抑制空间烧孔效应的目的。
[Abstract]:With the rapid development of the times, even the terminal equipment into the communication network in the growing data traffic every day transmission are also in the surge in smart city, cloud computing and big data, networking, fiber to the home (FTTH) and other fields are booming, increasingly high demands on the optical communication network bandwidth and transmission speed. Face the problem of large volume of discrete optical devices and big power consumption, photonic integration technology (PIC) is a number of optical devices integrated on a semiconductor substrate, is an important development direction of optical communication network in the future high rate and large capacity of the. Semiconductor laser as an important source of light plays an important role in optical communication network. So this requires high performance of laser. At the same time, most communication networks are closely related to ordinary people. So we need to take account of the cost of semiconductor lasers. Through the reconstruction equivalent chirp technology (REC) design of semiconductor laser, can improve the performance of laser, and can reduce the cost, it is through sampling structure design, can achieve the same performance of complex gratings using uniform seed grating, because the sampling period is usually micron precision, so the reconstruction equivalent chirp technology will transform the nanometer level precision technology the process of micron level precision, which greatly reduces the requirement of the process, thereby reducing the cost. The main purpose of this thesis is to design a laser based on the reconstructed equivalent chirp technique and measure the semiconductor laser at the same time. The first chapter is the introduction of this paper. It mainly introduces the development history of optical communication, the technology of photonic integration, the development history of semiconductor lasers, the classification of semiconductor lasers, and the working principles of semiconductor lasers, mainly about the background of semiconductor laser research. The second chapter is the theoretical basis of semiconductor laser design research, first introduced the coupled mode theory, it is the basis of analysis of one-dimensional periodic structure of the Prague grating, transfer matrix method by the grating as many small matrix multiplication, the coupled mode equations are solved by the reflectivity and time delay. Then we introduce the basic reconstruction equivalent chirp technology and the extended equivalent phase shift technique of reconstructed equivalent chirp technology. It introduces phase shift in the sampling period, which is equivalent to introducing phase shift in different grades of grating. The third chapter introduces the improvement of semiconductor laser design single-mode characteristics, it is mainly to achieve the equivalent period of two parts about seed grating is not the same as the bend waveguide, around the two part of the sampling period is not the same, at the same time using the equivalent phase shift technology, which can realize overlap gratings in +1 or -1 transmission wavelength at the same time, the zero order wavelength becomes out of order, so as to improve the single mode laser. The bending waveguide can solve the process difficulty of making non-uniform seed gratings and also reduce the cost of production. At the same time, the multi wavelength laser array is designed by this structure, and the loss and optimization of the junction of the curved waveguide are studied. Then it introduces the design of laser work to eliminate the spatial hole burning effect, its structure for phase shift structure of the middle part in the region without equivalent refractive index modulation, through the simulation we find that the optical field distribution of the middle area of this structure is not gathered, which was to eliminate the spatial hole burning effect. The fourth chapter introduces the establishment of laser measurement and measurement system, a series of laser spectroscopy, laser bending test, waveguide DFB laser based on chip REC technology to design the SFDR measurement (SFDR) measurement and eye. The main innovation points of this paper are: first, the design of the grating around two part equivalent seed grating period is not the same, not the same as the sampling cycle structure using reconstruction equivalent chirp technology and curved waveguide, so it can improve the properties of single-mode laser; second, the new type of semiconductor laser with no grating middle region is designed by using the technology of reconstruction equivalent chirp thus, achieve the purpose of inhibiting the spatial hole burning effect.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN248

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