本文關(guān)鍵詞： 信號處理 光纖器件 雙包層雙芯光纖 光時域微分器　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：光信號處理技術(shù)可以在光域直接對信號進行快速處理,是克服"電子瓶頸"實現(xiàn)全光網(wǎng)絡(luò)的重要技術(shù)之一,應(yīng)用領(lǐng)域十分廣泛。光時域微分器可以在光域直接對光信號進行時域微分運算,是光信號處理技術(shù)中一種十分重要的光器件。本文提出了一種雙包層雙芯光纖光波導(dǎo)結(jié)構(gòu),研究了該波導(dǎo)的模場矩陣、特征方程、傳輸特性以及色散特性;基于雙包層雙芯光纖光波導(dǎo)結(jié)構(gòu),提出了一種實現(xiàn)一階光時域微分器的方案,并分析了該微分器的3dB帶寬、能量效率和誤差因子等特性。本文主要完成的研究工作如下:(1)對目前全光網(wǎng)絡(luò)中光信號處理技術(shù)的現(xiàn)狀進行了深入研究,并分析了己有光時域微分器實現(xiàn)方案的優(yōu)缺點。(2)提出了一種雙包層雙芯光纖光波導(dǎo)結(jié)構(gòu)。通過對處于不同耦合狀態(tài)下雙芯光纖的傳輸特性分析,得出了在完全耦合狀態(tài)下,雙包層雙芯光纖光波導(dǎo)結(jié)構(gòu)的模場矩陣和特征方程。重點研究了雙包層雙芯光纖波導(dǎo)結(jié)構(gòu)的傳輸特性和色散特性,結(jié)果表明:該光波導(dǎo)的傳輸常數(shù)與入射波長、內(nèi)包層半徑和折射率差成反比關(guān)系、與纖芯半徑成正比關(guān)系;雙包層雙芯光纖相比于普通雙芯光纖,具有更大的傳輸常數(shù);雙包層雙芯光纖光波導(dǎo)的色散隨著入射波長的增加而線性增加。本文得出的上述結(jié)論,為提出基于雙包層雙芯光纖的一階光時域微分器提供了重要的理論依據(jù)。(3)提出了一種基于雙包層雙芯光纖光波導(dǎo)實現(xiàn)的一階光時域微分器方案,研究分析了該微分器的3dB帶寬、誤差因子和能量效率等特性,并驗證了對高斯脈沖信號的一階微分效果。結(jié)果表明,該微分器的中心頻率與光纖長度成反比關(guān)系,通過調(diào)節(jié)雙包層雙芯光纖的長度能夠?qū)崿F(xiàn)微分器中心頻率的調(diào)諧;微分器3dB帶寬與雙包層雙芯光纖內(nèi)包層半徑、折射率差成反比關(guān)系,且3dB帶寬最大可達到1.775THz,高于基于單包層雙芯光纖一階光時域微分器的最大3dB帶寬;當輸入高斯脈沖的衰減因子為0.5ps時,誤差因子最小可達到0.00997。
[Abstract]:The optical signal processing technology can process the signal directly in the optical domain, which is one of the important technologies to overcome the "electronic bottleneck" to realize the all-optical network. The optical time domain differentiator is a very important optical device in the optical signal processing technology, which can directly perform the time domain differential operation of the optical signal in the optical domain. In this paper, a double-clad double-core optical waveguide structure is proposed. The mode field matrix, characteristic equation, transmission characteristics and dispersion characteristics of the waveguide are studied. Based on the double-clad double-core fiber waveguide structure, a scheme to realize the first order optical time-domain differentiator is proposed, and the 3dB bandwidth of the differentiator is analyzed. Energy efficiency and error factor. The main research work in this paper is as follows: 1) the current situation of optical signal processing technology in all-optical network is deeply studied. The advantages and disadvantages of the existing optical time domain differentiator (OTD) are analyzed. (2) A double-clad double-core fiber waveguide structure is proposed. By analyzing the transmission characteristics of the dual-core fiber in different coupling states, it is concluded that the optical waveguide structure is fully coupled. The mode field matrix and characteristic equation of double-clad double-core fiber waveguide structure are studied. The transmission and dispersion characteristics of double-clad double-core fiber waveguide structure are studied. The results show that the transmission constant and incident wavelength of the double-clad double-core fiber waveguide are obtained. The inner cladding radius is inversely proportional to the refractive index difference and is proportional to the core radius. The dispersion of double-clad double-core fiber waveguide increases linearly with the increase of incident wavelength. In order to provide an important theoretical basis for the first order optical time domain differentiator based on double cladding double core fiber, a first order optical time domain differentiator scheme based on double clad double core fiber waveguide is proposed. The 3dB bandwidth of the differentiator is studied and analyzed. The error factor and energy efficiency are used to verify the first-order differential effect of Gao Si pulse signal. The results show that the central frequency of the differentiator is inversely proportional to the fiber length. The center frequency of differentiator can be tuned by adjusting the length of double-core fiber, and the 3dB bandwidth of differentiator is inversely proportional to the inner cladding radius and refractive index difference of double-clad double-core fiber. The maximum bandwidth of 3 dB can reach 1.775THz, which is higher than that based on single-cladding double-core fiber first order optical time domain differentiator, and the minimum error factor can reach 0.00997 when the attenuation factor of input Gao Si pulse is 0.5 PS.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN253

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