【摘要】：科技飛速發(fā)展,人類社會(huì)進(jìn)入信息化時(shí)代。對(duì)信息存儲(chǔ)、傳輸以及處理均是按數(shù)字信號(hào)進(jìn)行。然而自然界中的信息均是模擬信號(hào)。模數(shù)轉(zhuǎn)換器是模擬域與數(shù)字域的橋梁,是信息系統(tǒng)不可缺少的核心。傳統(tǒng)的模數(shù)轉(zhuǎn)換是在電域進(jìn)行的,然而因?yàn)殡娮悠款i的存在,傳統(tǒng)的模數(shù)轉(zhuǎn)換無法適應(yīng)超高速信號(hào)處理的需求。與此同時(shí),全光信號(hào)處理發(fā)展迅猛,吸引了各國(guó)專家學(xué)者的注意。全光模數(shù)轉(zhuǎn)換不但可以規(guī)避電子瓶頸的制約,而且潛力巨大,是信號(hào)處理領(lǐng)域的關(guān)鍵研究方向。全光量化技術(shù)是全光模數(shù)轉(zhuǎn)換的核心,也是重點(diǎn)研究對(duì)象。其中,基于孤子自頻移的全光量化方案因?yàn)轫憫?yīng)迅速、效果良好,吸引了許多學(xué)者的關(guān)注與研究。本論文針對(duì)基于孤子自頻移量化編碼方案中存在的時(shí)延問題進(jìn)行深入的研究,研究?jī)?nèi)容包括以下幾個(gè)方面： (1)介紹了全光模數(shù)轉(zhuǎn)換的研究意義,回顧了國(guó)內(nèi)外全光模數(shù)轉(zhuǎn)換的發(fā)展歷史以及研究現(xiàn)狀。介紹了色散補(bǔ)償?shù)亩喾N技術(shù)。 (2)研究基于孤子自頻移的全光量化編碼結(jié)構(gòu),從麥克斯韋方程組開始,演算得到廣義非線性薛定諤方程,進(jìn)而研究了求解該方程的兩種基本方法——分步傅立葉法和矩量法。綜合利用矩量法和分步傅里葉法求解得出影響光脈沖中心頻率改變量以及時(shí)延的因素有哪些,研究確定時(shí)延補(bǔ)償原理,并針對(duì)性的提出兩種補(bǔ)償時(shí)延的方法——負(fù)色散光纖法和啁啾光纖布拉格光柵法。 (3)研究了負(fù)色散光纖折射率剖面的不同類型。依據(jù)前面確立的時(shí)延補(bǔ)償機(jī)制,脈沖時(shí)延補(bǔ)償線是一條直線,并且脈沖時(shí)延補(bǔ)償線的斜率與脈沖時(shí)延線的斜率恰好相反。選擇出最佳的負(fù)色散光纖用于補(bǔ)償時(shí)延。系統(tǒng)仿真結(jié)果表明,時(shí)延補(bǔ)償后最大的時(shí)間誤差是0.9ps,此方案支持的最大采樣率是555GSa/s,輸出的編碼結(jié)果正確有效。 (4)研究光纖光柵耦合模理論,利用傳輸矩陣法完成數(shù)值求解。然后采用單一變量法,分析研究啁啾變量、光柵長(zhǎng)度、調(diào)制深度、切趾技術(shù)對(duì)啁啾光纖布拉格光柵反射譜和時(shí)延線產(chǎn)生的影響。分析研究結(jié)果,設(shè)計(jì)最佳參數(shù)的啁啾光纖布拉格光柵補(bǔ)償時(shí)延。系統(tǒng)仿真結(jié)果表明,時(shí)延補(bǔ)償后最大的時(shí)間誤差是3.3ps,此方案支持的最大采樣率是151GSa/s,輸出的編碼結(jié)果正確有效。
[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.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN792

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