【摘要】：隨著互聯(lián)網(wǎng)和通信網(wǎng)中各種數(shù)據(jù)業(yè)務(wù)需求的快速增加,高效、高速、大容量、智能交換的全光網(wǎng)絡(luò)日漸成為人們的研究熱點。量子點半導(dǎo)體光放大器(Quantum-dot semiconductor optical amplifier,QD-SOA)具有優(yōu)異的非線性特性,如高的飽和輸出功率、寬增益譜、溫度靈敏性低、閾值電流低等,因此非常適合被應(yīng)用于全光網(wǎng)絡(luò)。波長轉(zhuǎn)換技術(shù)和邏輯運算日益成為全光網(wǎng)絡(luò)和光通信系統(tǒng)中的關(guān)鍵技術(shù),波長轉(zhuǎn)換器及全光邏輯運算中伴隨的波長轉(zhuǎn)換功能實現(xiàn)了傳輸信息在兩個波長之間的轉(zhuǎn)換,通過對波長的再利用,提高了波長的利用率;通過數(shù)字交叉連接中波長路由功能的實現(xiàn),對波分復(fù)用網(wǎng)絡(luò)中的阻塞率進一步降低,提高了波分復(fù)用網(wǎng)絡(luò)的靈活性和可靠性。所以,基于QD-SOA效應(yīng)的全光波長轉(zhuǎn)換器、光邏輯門及光判決系統(tǒng)日漸成為了人們研究的熱點。本文基于QD-SOA的三能級結(jié)構(gòu)模型,模擬仿真了其靜態(tài)及動態(tài)特性,并采用牛頓迭代法(Newton)和四階龍格-庫塔法(Runge-Kutta)求解載流子速率方程和光場方程�；赒D-SOA的交叉相位調(diào)制型(Cross-phase modulation,XPM)的全光波長轉(zhuǎn)換(All-optical wavelength converter,AOWC)系統(tǒng)仿真分析了量子點半導(dǎo)體波長轉(zhuǎn)換特性,研究了有源區(qū)長度、泵浦光脈沖寬度(Pulse width)、最大模式增益、損耗系數(shù)、電子躍遷時間等參數(shù)對波長轉(zhuǎn)換器轉(zhuǎn)換特性及XPM型邏輯異或門、或門轉(zhuǎn)換效率的影響。主要內(nèi)容如下:1.介紹了全光波長轉(zhuǎn)換器、全光邏輯門、判決門的研究意義和國內(nèi)外發(fā)展現(xiàn)狀。簡述了基于QD-SOA-XPM效應(yīng)實現(xiàn)的邏輯或門、異或門的方案。2.基于XPM效應(yīng)的全光波長轉(zhuǎn)換器,模擬仿真了其轉(zhuǎn)換效率特性,分析了最大模式增益、損耗系數(shù)、電子躍遷時間的變化對轉(zhuǎn)換效率的影響。結(jié)果表明,減小輸入脈沖寬度、損耗系數(shù)、電子躍遷時間,增加有源區(qū)長度、最大模式增益均可以提高波長轉(zhuǎn)換器轉(zhuǎn)換效率。并且在基于XPM效應(yīng)全光邏輯異或門的仿真分析中,通過改變參量提高了轉(zhuǎn)換光轉(zhuǎn)換效率,從理論上給出了全光邏輯異或門優(yōu)化的工作參數(shù),對超高速信息處理、全光網(wǎng)絡(luò)中光判決技術(shù)等未來光網(wǎng)絡(luò)的發(fā)展具有重要的指導(dǎo)意義。3.基于XPM效應(yīng)的邏輯異或門、或門,研究了邏輯門的消光比(ER)、Q因子、啁啾,以及波長轉(zhuǎn)換效率特性。分析了有源區(qū)長度、電子躍遷時間、脈沖寬度、最大模式增益、損耗系數(shù)等因素對邏輯門轉(zhuǎn)換效率的影響規(guī)律。結(jié)果表明,要提高輸出信號的質(zhì)量從而獲得高的轉(zhuǎn)換效率,需兼顧消光比、Q因子特性,選取適當?shù)妮斎朊}沖寬度、損耗系數(shù)、電子躍遷時間,有源區(qū)長度、最大模式增益�；赬PM效應(yīng)全光邏輯異或門、或門的研究中,通過改變參量提高了轉(zhuǎn)換光轉(zhuǎn)換效率,從理論上給出了全光邏輯異或門優(yōu)化的工作條件。4.利用量子點半導(dǎo)體光放大器三能級結(jié)構(gòu)模型研究了QD-SOA有源區(qū)載流子恢復(fù)特性,并且基于馬赫-曾德爾干涉儀效應(yīng)(MZI)的光判決門,仿真分析了光場限制因子、注入電流和泵浦光功率等對光判決門對比度(CR)的影響。在QD-SOA載流子恢復(fù)特性的研究基礎(chǔ)上,通過注入補充電流,并改變載流子濃度、光場限制因子、泵浦光功率等參數(shù),探究了基于QD-SOA-MZI結(jié)構(gòu)光判決門的對比度特性。模擬仿真結(jié)果顯示:在有源區(qū)注入補充電流,促進載流子濃度的恢復(fù),進而提高了電子占有幾率;在注入泵浦光功率相同的條件下,增大光場限制因子,光開關(guān)對比度提高;對比有無補充電流注入兩種情況下的光開關(guān)對比度可以看出,注入補充電流并適當設(shè)置光場限制因子,提高了光開關(guān)對比度。所以,適當增加QD-SOA注入電流,對提高光判決門對比度以及改善光開關(guān)性能提供了有利的條件,對優(yōu)化光判決參數(shù)具有重要的意義。
[Abstract]:Quantum dot semiconductor optical amplifier (QD-SOA) has excellent nonlinear characteristics, such as high saturated output power, wide bandwidth and so on. Wavelength conversion technology and logic operation are increasingly becoming the key technologies in all-optical networks and optical communication systems. Wavelength converters and wavelength conversion functions associated with all-optical logic operations realize the conversion of transmission information between two wavelengths. Conversion, through the reuse of wavelength, the utilization of wavelength is improved; through the realization of wavelength routing function in digital cross-connect, the blocking rate of WDM network is further reduced, and the flexibility and reliability of WDM network are improved. Therefore, all-optical wavelength converter, optical logic gate and optical decision system based on QD-SOA effect are proposed. In this paper, based on the QD-SOA three-level structure model, the static and dynamic characteristics are simulated and solved by Newton iteration method and Runge-Kutta method. All-optical wavelength converter (AOWC) system is used to simulate and analyze the wavelength conversion characteristics of quantum dot semiconductor. The effects of active region length, Pulse width, maximum mode gain, loss coefficient, electron transition time on wavelength conversion characteristics and XPM logic XOR gate or gate are studied. The main contents are as follows: 1. The research significance and development status of all-optical wavelength converter, all-optical logic gate and decision gate are introduced. The scheme of logic or gate and XOR gate based on QD-SOA-XPM effect is briefly described. 2. All-optical wavelength converter based on XPM effect is simulated and its conversion efficiency characteristics are analyzed. The results show that the conversion efficiency of wavelength converter can be improved by reducing input pulse width, loss coefficient, electron transition time, increasing active region length and maximum mode gain. In this paper, the conversion efficiency is improved by changing the parameters, and the working parameters of all-optical logic XOR gate optimization are given theoretically. It has important guiding significance for the development of future optical networks such as ultra-high speed information processing and optical decision technology in all-optical networks. 3. Based on XPM effect, the extinction of logic gates is studied. The effects of active region length, electron transition time, pulse width, maximum mode gain and loss coefficient on the conversion efficiency of logic gates are analyzed. In the study of all-optical logic XOR gates or gates based on XPM effect, the conversion efficiency is improved by changing the parameters, and the optimum operating conditions of all-optical logic XOR gates are given theoretically. Carrier recovery characteristics in QD-SOA active region are studied by the three-level structure model of amplifier. Based on the optical decision gate of Mach-Zehnder interferometer effect (MZI), the effects of light field limiting factor, injection current and pump power on the contrast of optical decision gate (CR) are simulated and analyzed. The contrast characteristics of the QD-SOA-MZI structured light decision gate are investigated by changing the carrier concentration, the limiting factor of the optical field and the pump power. Under the same conditions, the contrast of optical switch can be improved by increasing the limiting factor of optical field. Compared with the contrast of optical switch with or without the supplementary current injection, the contrast of optical switch can be improved by injecting supplementary current and setting the limiting factor of optical field appropriately. It also provides favorable conditions for improving the performance of optical switches, and is of great significance for optimizing optical decision parameters.
【學(xué)位授予單位】：曲阜師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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