基于QD-SOA-MZI型全光逻辑门及判决门的研究
发布时间：2018-08-14 10:31
【摘要】：随着互联网和通信网中各种数据业务需求的快速增加,高效、高速、大容量、智能交换的全光网络日渐成为人们的研究热点。量子点半导体光放大器(Quantum-dot semiconductor optical amplifier,QD-SOA)具有优异的非线性特性,如高的饱和输出功率、宽增益谱、温度灵敏性低、阈值电流低等,因此非常适合被应用于全光网络。波长转换技术和逻辑运算日益成为全光网络和光通信系统中的关键技术,波长转换器及全光逻辑运算中伴随的波长转换功能实现了传输信息在两个波长之间的转换,通过对波长的再利用,提高了波长的利用率;通过数字交叉连接中波长路由功能的实现,对波分复用网络中的阻塞率进一步降低,提高了波分复用网络的灵活性和可靠性。所以,基于QD-SOA效应的全光波长转换器、光逻辑门及光判决系统日渐成为了人们研究的热点。本文基于QD-SOA的三能级结构模型,模拟仿真了其静态及动态特性,并采用牛顿迭代法(Newton)和四阶龙格-库塔法(Runge-Kutta)求解载流子速率方程和光场方程。基于QD-SOA的交叉相位调制型(Cross-phase modulation,XPM)的全光波长转换(All-optical wavelength converter,AOWC)系统仿真分析了量子点半导体波长转换特性,研究了有源区长度、泵浦光脉冲宽度(Pulse width)、最大模式增益、损耗系数、电子跃迁时间等参数对波长转换器转换特性及XPM型逻辑异或门、或门转换效率的影响。主要内容如下:1.介绍了全光波长转换器、全光逻辑门、判决门的研究意义和国内外发展现状。简述了基于QD-SOA-XPM效应实现的逻辑或门、异或门的方案。2.基于XPM效应的全光波长转换器,模拟仿真了其转换效率特性,分析了最大模式增益、损耗系数、电子跃迁时间的变化对转换效率的影响。结果表明,减小输入脉冲宽度、损耗系数、电子跃迁时间,增加有源区长度、最大模式增益均可以提高波长转换器转换效率。并且在基于XPM效应全光逻辑异或门的仿真分析中,通过改变参量提高了转换光转换效率,从理论上给出了全光逻辑异或门优化的工作参数,对超高速信息处理、全光网络中光判决技术等未来光网络的发展具有重要的指导意义。3.基于XPM效应的逻辑异或门、或门,研究了逻辑门的消光比(ER)、Q因子、啁啾,以及波长转换效率特性。分析了有源区长度、电子跃迁时间、脉冲宽度、最大模式增益、损耗系数等因素对逻辑门转换效率的影响规律。结果表明,要提高输出信号的质量从而获得高的转换效率,需兼顾消光比、Q因子特性,选取适当的输入脉冲宽度、损耗系数、电子跃迁时间,有源区长度、最大模式增益。基于XPM效应全光逻辑异或门、或门的研究中,通过改变参量提高了转换光转换效率,从理论上给出了全光逻辑异或门优化的工作条件。4.利用量子点半导体光放大器三能级结构模型研究了QD-SOA有源区载流子恢复特性,并且基于马赫-曾德尔干涉仪效应(MZI)的光判决门,仿真分析了光场限制因子、注入电流和泵浦光功率等对光判决门对比度(CR)的影响。在QD-SOA载流子恢复特性的研究基础上,通过注入补充电流,并改变载流子浓度、光场限制因子、泵浦光功率等参数,探究了基于QD-SOA-MZI结构光判决门的对比度特性。模拟仿真结果显示:在有源区注入补充电流,促进载流子浓度的恢复,进而提高了电子占有几率;在注入泵浦光功率相同的条件下,增大光场限制因子,光开关对比度提高;对比有无补充电流注入两种情况下的光开关对比度可以看出,注入补充电流并适当设置光场限制因子,提高了光开关对比度。所以,适当增加QD-SOA注入电流,对提高光判决门对比度以及改善光开关性能提供了有利的条件,对优化光判决参数具有重要的意义。
[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.
【学位授予单位】：曲阜师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
本文编号：2182575
[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.
【学位授予单位】：曲阜师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
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