全光模数转换中的时延补偿研究
发布时间：2018-07-29 09:52
【摘要】：科技飞速发展,人类社会进入信息化时代。对信息存储、传输以及处理均是按数字信号进行。然而自然界中的信息均是模拟信号。模数转换器是模拟域与数字域的桥梁,是信息系统不可缺少的核心。传统的模数转换是在电域进行的,然而因为电子瓶颈的存在,传统的模数转换无法适应超高速信号处理的需求。与此同时,全光信号处理发展迅猛,吸引了各国专家学者的注意。全光模数转换不但可以规避电子瓶颈的制约,而且潜力巨大,是信号处理领域的关键研究方向。全光量化技术是全光模数转换的核心,也是重点研究对象。其中,基于孤子自频移的全光量化方案因为响应迅速、效果良好,吸引了许多学者的关注与研究。本论文针对基于孤子自频移量化编码方案中存在的时延问题进行深入的研究,研究内容包括以下几个方面： (1)介绍了全光模数转换的研究意义,回顾了国内外全光模数转换的发展历史以及研究现状。介绍了色散补偿的多种技术。 (2)研究基于孤子自频移的全光量化编码结构,从麦克斯韦方程组开始,演算得到广义非线性薛定谔方程,进而研究了求解该方程的两种基本方法——分步傅立叶法和矩量法。综合利用矩量法和分步傅里叶法求解得出影响光脉冲中心频率改变量以及时延的因素有哪些,研究确定时延补偿原理,并针对性的提出两种补偿时延的方法——负色散光纤法和啁啾光纤布拉格光栅法。 (3)研究了负色散光纤折射率剖面的不同类型。依据前面确立的时延补偿机制,脉冲时延补偿线是一条直线,并且脉冲时延补偿线的斜率与脉冲时延线的斜率恰好相反。选择出最佳的负色散光纤用于补偿时延。系统仿真结果表明,时延补偿后最大的时间误差是0.9ps,此方案支持的最大采样率是555GSa/s,输出的编码结果正确有效。 (4)研究光纤光栅耦合模理论,利用传输矩阵法完成数值求解。然后采用单一变量法,分析研究啁啾变量、光栅长度、调制深度、切趾技术对啁啾光纤布拉格光栅反射谱和时延线产生的影响。分析研究结果,设计最佳参数的啁啾光纤布拉格光栅补偿时延。系统仿真结果表明,时延补偿后最大的时间误差是3.3ps,此方案支持的最大采样率是151GSa/s,输出的编码结果正确有效。
[Abstract]:With the rapid development of science and technology, human society has entered the information age. For information storage, transmission and processing are based on digital signals. However, the information in nature is analogue signal. Analog-to-digital converter (ADC) is the bridge between analog domain and digital domain, and it is the indispensable core of information system. The traditional analog-to-digital conversion is carried out in the electrical domain. However, due to the existence of electronic bottleneck, the traditional analog-to-digital conversion can not meet the needs of ultra-high speed signal processing. At the same time, all-optical signal processing has developed rapidly and attracted the attention of experts and scholars from all over the world. All optical A / D conversion can not only avoid the restriction of electronic bottleneck, but also has great potential. It is a key research direction in signal processing field. All-optical quantization technology is the core of all-optical A-D conversion, and it is also an important research object. Among them, soliton self-frequency shift based all-optical quantization scheme has attracted the attention and research of many scholars because of its rapid response and good effect. In this thesis, the time-delay problem in soliton-based self-frequency shift quantization coding scheme is studied in depth. The research contents include the following aspects: (1) the significance of all-optical A / D conversion is introduced. The development history and research status of all optical A / D conversion at home and abroad are reviewed. Several techniques of dispersion compensation are introduced. (2) All-optical quantization coding structure based on soliton self-frequency shift is studied. The generalized nonlinear Schrodinger equation is derived from Maxwell equations. Then, two basic methods for solving the equation, the fractional step Fourier method and the method of moments, are studied. Based on the method of moments and the fractional Fourier method, the factors affecting the central frequency change and delay of optical pulse are obtained, and the principle of time delay compensation is studied. Two methods of compensating time delay, negative dispersion fiber method and chirped fiber Bragg grating method, are proposed. (3) different types of refractive index profiles of negative dispersive fiber are studied. According to the time-delay compensation mechanism previously established, the pulse delay compensation line is a straight line, and the slope of the pulse delay compensation line is just opposite to that of the pulse delay line. The optimal negative dispersion fiber is selected to compensate the delay. The system simulation results show that the maximum time error after delay compensation is 0.9ps. the maximum sampling rate supported by this scheme is 555GSA / s, and the output coding results are correct and effective. (4) the coupled mode theory of fiber Bragg grating (FBG) is studied. The transfer matrix method is used to solve the problem. Then, the effects of chirped variables, grating length, modulation depth and apodization on the reflection spectrum and delay line of chirped fiber Bragg gratings are studied by single variable method. The results are analyzed and the optimal parameters of chirped fiber Bragg grating (FBG) are designed to compensate the time delay. The system simulation results show that the maximum time error after delay compensation is 3.3 pss. the maximum sampling rate supported by this scheme is 151 GSA / s, and the output coding results are correct and effective.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN792
本文编号：2152302
[Abstract]:With the rapid development of science and technology, human society has entered the information age. For information storage, transmission and processing are based on digital signals. However, the information in nature is analogue signal. Analog-to-digital converter (ADC) is the bridge between analog domain and digital domain, and it is the indispensable core of information system. The traditional analog-to-digital conversion is carried out in the electrical domain. However, due to the existence of electronic bottleneck, the traditional analog-to-digital conversion can not meet the needs of ultra-high speed signal processing. At the same time, all-optical signal processing has developed rapidly and attracted the attention of experts and scholars from all over the world. All optical A / D conversion can not only avoid the restriction of electronic bottleneck, but also has great potential. It is a key research direction in signal processing field. All-optical quantization technology is the core of all-optical A-D conversion, and it is also an important research object. Among them, soliton self-frequency shift based all-optical quantization scheme has attracted the attention and research of many scholars because of its rapid response and good effect. In this thesis, the time-delay problem in soliton-based self-frequency shift quantization coding scheme is studied in depth. The research contents include the following aspects: (1) the significance of all-optical A / D conversion is introduced. The development history and research status of all optical A / D conversion at home and abroad are reviewed. Several techniques of dispersion compensation are introduced. (2) All-optical quantization coding structure based on soliton self-frequency shift is studied. The generalized nonlinear Schrodinger equation is derived from Maxwell equations. Then, two basic methods for solving the equation, the fractional step Fourier method and the method of moments, are studied. Based on the method of moments and the fractional Fourier method, the factors affecting the central frequency change and delay of optical pulse are obtained, and the principle of time delay compensation is studied. Two methods of compensating time delay, negative dispersion fiber method and chirped fiber Bragg grating method, are proposed. (3) different types of refractive index profiles of negative dispersive fiber are studied. According to the time-delay compensation mechanism previously established, the pulse delay compensation line is a straight line, and the slope of the pulse delay compensation line is just opposite to that of the pulse delay line. The optimal negative dispersion fiber is selected to compensate the delay. The system simulation results show that the maximum time error after delay compensation is 0.9ps. the maximum sampling rate supported by this scheme is 555GSA / s, and the output coding results are correct and effective. (4) the coupled mode theory of fiber Bragg grating (FBG) is studied. The transfer matrix method is used to solve the problem. Then, the effects of chirped variables, grating length, modulation depth and apodization on the reflection spectrum and delay line of chirped fiber Bragg gratings are studied by single variable method. The results are analyzed and the optimal parameters of chirped fiber Bragg grating (FBG) are designed to compensate the time delay. The system simulation results show that the maximum time error after delay compensation is 3.3 pss. the maximum sampling rate supported by this scheme is 151 GSA / s, and the output coding results are correct and effective.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN792
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