高速大功率单行载流子光波导探测器的设计与研究

发布时间：2018-04-06 22:06

  本文选题：高速大功率　切入点：单行载流子　出处：《电子科技大学》2014年硕士论文

【摘要】：光电探测器是光纤通信系统中不可或缺的组成部件,其性能的优劣对整个通信系统的性能起着决定性作用。特别是在ROF(Radio Over Fiber)系统中,需要高速大功率的光电探测器来直接驱动天线。但是传统的PIN光电探测器和波导探测器无法达到高速大功率的要求。本文介绍了一种单行载流子垂直方向耦合波导探测器(UTC-VDCPD,Uni-Traveling-Carrier Vertical Directional Coupling Waveguide Photodetector),它采用垂直方向耦合器来解决传统光波导探测器光电流分布不均匀的问题,同时解决了垂直表面入射式光电探测器响应度与响应速度相互制约的问题,并在其中引入单行载流子(UTC,Uni-Traveling-Carrier)结构,使之实现高速大功率工作。本文的工作就是围绕UTC-VDCPD展开的,取得了以下研究成果:1、根据超模理论和数值仿真软件BeamProp对垂直方向耦合波导探测器进行分析。针对具体的波导结构,通过综合考虑光电流分布的均匀性和量子效率,确定了波导的结构参数。2、通过权衡饱和输出光电流与3dB带宽之间的矛盾,设计出了UTC结构,并用ATLAS仿真,得到了UTC-VDCPD的基本工作参数,3dB带宽约为13 GHz,输出光电流为260 mA,响应度为1.04 A/W,实现了高速大功率的要求。3、对器件在低注入光强和高注入光强下,器件内部的能带结构、电场强度、载流子浓度和电流密度的分布进行了详细的分析,同时还分析了器件的交流小信号特性和瞬态特性。4、分析了单行载流子光电探测器(UTC-PD,Uni-Traveling-Carrier Photodiode)的小信号模型,分析指出,在吸收层中引入准中性电场可以降低光生电子在该层的积累和增加器件的3dB带宽。5、在小信号模型的基础上研究了导带不连续对UTC-PD的影响,并分析了一个具体的结构。研究结果表明,导带不连续性使得3dB带宽降低,增加收集层掺杂浓度是消除这种不利影响的最有效的一种方式。
[Abstract]:Photoelectric detector is an indispensable component of optical fiber communication system. Its performance plays a decisive role in the performance of the whole communication system.Especially in ROF(Radio Over Fibersystem, high-speed and high-power photodetectors are needed to drive the antenna directly.But the traditional PIN photodetectors and waveguide detectors can not meet the requirements of high speed and high power.In this paper, a single row carrier vertical coupled waveguide detector, Uni-Traveling-Carrier Vertical Directional Coupling Waveguide Photodetector, is introduced. It uses vertical coupler to solve the problem of non-uniform photocurrent distribution in traditional optical waveguide detectors.At the same time, the problem of the mutual restriction between the responsivity and the response speed of the incident photodetector on the vertical surface is solved, and the Uni-Traveling-Carrier structure of single row carrier is introduced to make it work at high speed and high power.The work of this paper is carried out around UTC-VDCPD, and the following research results are obtained: 1. According to the supermode theory and numerical simulation software BeamProp, the vertical coupled waveguide detector is analyzed.Considering the uniformity of photocurrent distribution and quantum efficiency, the structure parameter of waveguide is determined by considering the uniformity of photocurrent distribution and quantum efficiency. By weighing the contradiction between the saturated output photocurrent and the bandwidth of 3dB, the UTC structure is designed and simulated by ATLAS.The basic operating parameters of UTC-VDCPD are 3 dB bandwidth of about 13 GHz, output photocurrent of 260 Ma, responsivity of 1.04 A / W, and the requirement of high speed and high power. The energy band structure and electric field intensity of the device under low injection light intensity and high injection light intensity are obtained.The distribution of carrier concentration and current density is analyzed in detail. At the same time, the small signal characteristics and transient characteristics of the device are analyzed. The small-signal model of the single-line carrier photodetector is analyzed.The introduction of quasi-neutral electric field in the absorption layer can reduce the accumulation of photogenerated electrons in this layer and increase the 3dB bandwidth of the device. Based on the small-signal model, the influence of discontinuity of conduction band on UTC-PD is studied, and a concrete structure is analyzed.The results show that the band discontinuity reduces the bandwidth of 3dB, and increasing the doping concentration of the collection layer is the most effective way to eliminate this adverse effect.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11
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本文编号：1719096