本文選題：高速大功率　切入點：單行載流子　出處：《電子科技大學(xué)》2014年碩士論文

【摘要】：光電探測器是光纖通信系統(tǒng)中不可或缺的組成部件,其性能的優(yōu)劣對整個通信系統(tǒng)的性能起著決定性作用。特別是在ROF(Radio Over Fiber)系統(tǒng)中,需要高速大功率的光電探測器來直接驅(qū)動天線。但是傳統(tǒng)的PIN光電探測器和波導(dǎo)探測器無法達(dá)到高速大功率的要求。本文介紹了一種單行載流子垂直方向耦合波導(dǎo)探測器(UTC-VDCPD,Uni-Traveling-Carrier Vertical Directional Coupling Waveguide Photodetector),它采用垂直方向耦合器來解決傳統(tǒng)光波導(dǎo)探測器光電流分布不均勻的問題,同時解決了垂直表面入射式光電探測器響應(yīng)度與響應(yīng)速度相互制約的問題,并在其中引入單行載流子(UTC,Uni-Traveling-Carrier)結(jié)構(gòu),使之實現(xiàn)高速大功率工作。本文的工作就是圍繞UTC-VDCPD展開的,取得了以下研究成果:1、根據(jù)超模理論和數(shù)值仿真軟件BeamProp對垂直方向耦合波導(dǎo)探測器進行分析。針對具體的波導(dǎo)結(jié)構(gòu),通過綜合考慮光電流分布的均勻性和量子效率,確定了波導(dǎo)的結(jié)構(gòu)參數(shù)。2、通過權(quán)衡飽和輸出光電流與3dB帶寬之間的矛盾,設(shè)計出了UTC結(jié)構(gòu),并用ATLAS仿真,得到了UTC-VDCPD的基本工作參數(shù),3dB帶寬約為13 GHz,輸出光電流為260 mA,響應(yīng)度為1.04 A/W,實現(xiàn)了高速大功率的要求。3、對器件在低注入光強和高注入光強下,器件內(nèi)部的能帶結(jié)構(gòu)、電場強度、載流子濃度和電流密度的分布進行了詳細(xì)的分析,同時還分析了器件的交流小信號特性和瞬態(tài)特性。4、分析了單行載流子光電探測器(UTC-PD,Uni-Traveling-Carrier Photodiode)的小信號模型,分析指出,在吸收層中引入準(zhǔn)中性電場可以降低光生電子在該層的積累和增加器件的3dB帶寬。5、在小信號模型的基礎(chǔ)上研究了導(dǎo)帶不連續(xù)對UTC-PD的影響,并分析了一個具體的結(jié)構(gòu)。研究結(jié)果表明,導(dǎo)帶不連續(xù)性使得3dB帶寬降低,增加收集層摻雜濃度是消除這種不利影響的最有效的一種方式。
[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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.11
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本文編號：1719096