單端量子點(diǎn)半導(dǎo)體光放大器的動(dòng)態(tài)特性研究
發(fā)布時(shí)間：2018-07-25 19:25
【摘要】：全光通信是目前光纖通信技術(shù)發(fā)展的主要方向,其在解決節(jié)點(diǎn)間光/電/光轉(zhuǎn)換瓶頸問題的同時(shí)也提高了光纖帶寬利用率。光信號(hào)在光領(lǐng)域處理是全光通信網(wǎng)絡(luò)發(fā)揮優(yōu)勢的基礎(chǔ),而實(shí)現(xiàn)全光信息處理又依靠光器件,尤其以半導(dǎo)體光放大器(SOA)為基礎(chǔ)的各種功能器件成為光信息處理的關(guān)鍵。SOA可分為體材料Bulk-SOA、量子阱QW-SOA、量子線SOA以及量子點(diǎn)SOA(QD-SOA),其中QD-SOA性能優(yōu)越,態(tài)密度是離散的δ函數(shù),具有高增益、低溫度靈敏性、低線寬增強(qiáng)因子及門限電流小等特點(diǎn)。然而雙端QD-SOA應(yīng)用于全光通信網(wǎng)絡(luò)時(shí),信號(hào)經(jīng)處理后消光比容易退化。單端QD-SOA與雙端QD-SOA不同,后端面鍍有適當(dāng)反射率的增透膜,通過雙程增益就可以消除光信號(hào)消光比退化現(xiàn)象。本文主要對單端QD-SOA在全光信息處理方面應(yīng)用進(jìn)行了研究,主要內(nèi)容有以下幾點(diǎn):1.首先詳細(xì)討論了光纖通信的發(fā)展歷程,對通信網(wǎng)絡(luò)各基本組成部分(信源、傳輸媒介及光器件)進(jìn)行描述,分析了這種通信方式能夠解決光/電/光轉(zhuǎn)換瓶頸問題的原因。然后介紹了實(shí)現(xiàn)全光波長轉(zhuǎn)換技術(shù)和邏輯運(yùn)算門技術(shù)的常規(guī)方法,最后闡述了研究單端QD-SOA的目的及意義。2.在討論傳統(tǒng)SOA和雙端QD-SOA運(yùn)轉(zhuǎn)機(jī)制和結(jié)構(gòu)基礎(chǔ)上,詳細(xì)介紹了單端QD-SOA的結(jié)構(gòu)特點(diǎn)以及實(shí)現(xiàn)光雙倍放大原理,另外對有源區(qū)量子點(diǎn)材料態(tài)密度、制備方法和應(yīng)用價(jià)值進(jìn)行了相關(guān)介紹。3.依據(jù)光信號(hào)在QD-SOA的傳播方程,有源區(qū)分段方法,并采用牛頓迭代方法求解載流子的三能級(jí)躍遷速率方程,建立了針對研究單端QD-SOA靜態(tài)特性的理論模型。通過靜態(tài)模型,分析了單端QD-SOA的靜態(tài)增益及載流子能級(jí)間分布。在有源區(qū)粗分段基礎(chǔ)上,對每小段再次細(xì)化,利用定步長的四階龍格-庫塔法求解非線性躍遷速率方程,最終建立了研究單端QD-SOA動(dòng)態(tài)特性模型。4.構(gòu)建了基于XGM效應(yīng)的單端QD-SOA波長轉(zhuǎn)換器方案,通過動(dòng)態(tài)模型研究了轉(zhuǎn)換光增益、啁啾以及消光比特性,分析了輸入光功率、有源區(qū)長度、最大模式增益、線寬增強(qiáng)因子、能級(jí)間載流子躍遷時(shí)間、波長轉(zhuǎn)換間隔等對各種特性的影響。并特別對比了單雙端QD-SOA波長轉(zhuǎn)換器的消光比特性,得出單端波長轉(zhuǎn)換器結(jié)構(gòu)消光比性能更好。對于基于單端QD-SOA的XGM全光或非門,通過模擬得出改變輸入光脈沖序列組合不會(huì)影響全光邏輯或非作用效果,另外也證明了降低輸入光信號(hào)脈寬可以消除超高速光邏輯或非門碼型效應(yīng)的方法。
[Abstract]:All optical communication is the main developing direction of optical fiber communication technology. It not only solves the bottleneck problem of optical / electrical / optical conversion between nodes, but also improves the utilization rate of optical fiber bandwidth. Optical signal processing in optical field is the basis of all-optical communication network, and the realization of all-optical information processing depends on optical devices. In particular, various functional devices based on semiconductor optical amplifier (SOA) become the key of optical information processing. SOAS can be divided into bulk materials, quantum well QW-SOA, quantum wire SOA and quantum dot SOA (QD-SOA), in which QD-SOA has superior performance and density of state is a discrete 未 function. High gain, low temperature sensitivity, low linewidth enhancement factor and low threshold current. However, when two-terminal QD-SOA is used in all-optical communication networks, the extinction ratio is easy to degenerate after signal processing. Unlike QD-SOA with two ends, single end QD-SOA is coated with an antireflection film with appropriate reflectivity, and the degradation of the extinction ratio can be eliminated by double pass gain. In this paper, the application of single ended QD-SOA in all optical information processing is studied. The main contents are as follows: 1: 1. Firstly, the development course of optical fiber communication is discussed in detail, and the basic components of communication network (information source, transmission medium and optical device) are described, and the reason why this communication mode can solve the bottleneck problem of optical / electrical / optical conversion is analyzed. Then it introduces the conventional methods of realizing all optical wavelength conversion technology and logic operation gate technology. Finally, the purpose and significance of studying single terminal QD-SOA are expounded. On the basis of discussing the operation mechanism and structure of traditional SOA and two-terminal QD-SOA, the structure characteristics of single-ended QD-SOA and the principle of optical double magnification are introduced in detail. In addition, the density of states of quantum dots in active region is also discussed. The preparation method and application value were introduced. 3. Based on the propagation equation of optical signal in QD-SOA, the active division method, and the Newton iteration method to solve the three-level transition rate equation of carriers, a theoretical model for studying the static characteristics of single-ended QD-SOA is established. Based on the static model, the static gain and the distribution of carrier energy levels of single-ended QD-SOA are analyzed. On the basis of the coarse segment of the active region, each segment is refined again, and the fourth order Runge-Kutta method with fixed step size is used to solve the nonlinear transition rate equation. Finally, the dynamic characteristic model of single-ended QD-SOA is established. The scheme of single-ended QD-SOA wavelength converter based on XGM effect is constructed. The characteristics of conversion optical gain, chirp and extinction ratio are studied by dynamic model. The input optical power, active region length, maximum mode gain and linewidth enhancement factor are analyzed. The influence of carrier transition time and wavelength conversion interval between energy levels on various characteristics. In particular, the extinction ratio of single-ended QD-SOA wavelength converters is compared, and the performance of single-ended QD-SOA wavelength converters is better than that of single-ended QD-SOA wavelength converters. For XGM all-optical or non-gate based on single-ended QD-SOA, the simulation results show that changing the combination of input optical pulse sequences will not affect the all-optical logic or non-effect. It is also proved that reducing the pulse width of the input optical signal can eliminate the ultra-high speed optical logic or non-gate pattern effect.
【學(xué)位授予單位】：曲阜師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN722;TN929.11
本文編號(hào)：2144829
[Abstract]:All optical communication is the main developing direction of optical fiber communication technology. It not only solves the bottleneck problem of optical / electrical / optical conversion between nodes, but also improves the utilization rate of optical fiber bandwidth. Optical signal processing in optical field is the basis of all-optical communication network, and the realization of all-optical information processing depends on optical devices. In particular, various functional devices based on semiconductor optical amplifier (SOA) become the key of optical information processing. SOAS can be divided into bulk materials, quantum well QW-SOA, quantum wire SOA and quantum dot SOA (QD-SOA), in which QD-SOA has superior performance and density of state is a discrete 未 function. High gain, low temperature sensitivity, low linewidth enhancement factor and low threshold current. However, when two-terminal QD-SOA is used in all-optical communication networks, the extinction ratio is easy to degenerate after signal processing. Unlike QD-SOA with two ends, single end QD-SOA is coated with an antireflection film with appropriate reflectivity, and the degradation of the extinction ratio can be eliminated by double pass gain. In this paper, the application of single ended QD-SOA in all optical information processing is studied. The main contents are as follows: 1: 1. Firstly, the development course of optical fiber communication is discussed in detail, and the basic components of communication network (information source, transmission medium and optical device) are described, and the reason why this communication mode can solve the bottleneck problem of optical / electrical / optical conversion is analyzed. Then it introduces the conventional methods of realizing all optical wavelength conversion technology and logic operation gate technology. Finally, the purpose and significance of studying single terminal QD-SOA are expounded. On the basis of discussing the operation mechanism and structure of traditional SOA and two-terminal QD-SOA, the structure characteristics of single-ended QD-SOA and the principle of optical double magnification are introduced in detail. In addition, the density of states of quantum dots in active region is also discussed. The preparation method and application value were introduced. 3. Based on the propagation equation of optical signal in QD-SOA, the active division method, and the Newton iteration method to solve the three-level transition rate equation of carriers, a theoretical model for studying the static characteristics of single-ended QD-SOA is established. Based on the static model, the static gain and the distribution of carrier energy levels of single-ended QD-SOA are analyzed. On the basis of the coarse segment of the active region, each segment is refined again, and the fourth order Runge-Kutta method with fixed step size is used to solve the nonlinear transition rate equation. Finally, the dynamic characteristic model of single-ended QD-SOA is established. The scheme of single-ended QD-SOA wavelength converter based on XGM effect is constructed. The characteristics of conversion optical gain, chirp and extinction ratio are studied by dynamic model. The input optical power, active region length, maximum mode gain and linewidth enhancement factor are analyzed. The influence of carrier transition time and wavelength conversion interval between energy levels on various characteristics. In particular, the extinction ratio of single-ended QD-SOA wavelength converters is compared, and the performance of single-ended QD-SOA wavelength converters is better than that of single-ended QD-SOA wavelength converters. For XGM all-optical or non-gate based on single-ended QD-SOA, the simulation results show that changing the combination of input optical pulse sequences will not affect the all-optical logic or non-effect. It is also proved that reducing the pulse width of the input optical signal can eliminate the ultra-high speed optical logic or non-gate pattern effect.
【學(xué)位授予單位】：曲阜師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN722;TN929.11
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 張新亮,孫軍強(qiáng),黃德修,易河清;交叉增益型全光波長轉(zhuǎn)換器消光比退化機(jī)理[J];華中理工大學(xué)學(xué)報(bào);1999年10期
相關(guān)碩士學(xué)位論文 前1條
1 蔣中;半導(dǎo)體光放大器動(dòng)態(tài)特性的研究[D];華中科技大學(xué);2006年
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