本文選題：光子晶體光纖　切入點：超連續(xù)譜　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：小芯徑光子晶體光纖具有高非線性、無截止單模和可控的色散等特性,在產(chǎn)生超連續(xù)譜方面具有重要的研究價值。目前,在光子晶體光纖中泵浦超短脈沖產(chǎn)生超連續(xù)譜的研究分析,已經(jīng)成為非線性光纖光學(xué)的一個重要分支。如何設(shè)計光子晶體光纖的幾何結(jié)構(gòu),獲得色散平坦變化的色散曲線,從而產(chǎn)生超寬帶超連續(xù)的連續(xù)譜,是當(dāng)前的研究熱點之一。本文的主要工作是研究在正常色散光纖中泵浦超短脈沖產(chǎn)生超連續(xù)譜,具體工作如下： 首先,為比較在光纖的正常色散區(qū)和反常色散區(qū)產(chǎn)生的SC,設(shè)計了零色散波長為1298nm的單模階躍折射率光纖。理論分析泵浦中心波長分別處于光纖零色散波長附近的正常色散區(qū)和反常色散區(qū)條件下產(chǎn)生的超連續(xù)譜。數(shù)值結(jié)果顯示在靠近零色散波長的反常色散區(qū)可以獲得帶寬為1418nm(20dB),平坦度為42dB的超連續(xù)譜。 其次,為研究光子晶體光纖的色散特性與其結(jié)構(gòu)參數(shù)的關(guān)系,分別使用了兩種設(shè)計光子晶體光纖參數(shù)的方法：保持孔直徑與孔間隔的比值不變,改變孔直徑；保持孔間隔不變,改變孔直徑與孔間隔的比值。通過數(shù)值計算,得到了全正常色散光子晶體光纖的幾何結(jié)構(gòu)。 為研究在正常色散區(qū)飛秒脈沖泵浦光子晶體光纖產(chǎn)生超連續(xù)譜,設(shè)計了全正常色散光子晶體光纖。數(shù)值計算了在該光纖中飛秒脈沖泵浦產(chǎn)生的超連續(xù)譜,光譜的帶寬為1131nm且平坦性較好。同時還研究了輸入脈沖峰值功率、初始寬度對產(chǎn)生的超連續(xù)譜的影響。 設(shè)計了一種部分空氣孔填充液體材料的全正常色散光子晶體光纖,本文選取液體油作為材料,結(jié)果表明光纖在波長為1000-2000nm范圍內(nèi)色散曲線平坦變化。模擬了所設(shè)計的光子晶體光纖中超連續(xù)譜的產(chǎn)生,最終得到的超連續(xù)譜范圍從918nm到2295nrn,并且整個在頻譜范圍內(nèi)平坦性較好。
[Abstract]:Abstract: small core diameter photonic crystal fiber has the characteristics of high nonlinearity, no cut-off single mode and controllable dispersion, so it has important research value in the generation of supercontinuum spectrum. The study and analysis of the supercontinuum spectrum generated by pumped ultrashort pulses in photonic crystal fiber has become an important branch of nonlinear fiber optics. How to design the geometric structure of photonic crystal fiber and obtain the dispersion curve with flat dispersion variation. The main work of this paper is to pump ultrashort pulse in normal dispersive fiber to produce supercontinuum spectrum. The main work is as follows:. First, A single-mode step refractive index fiber with zero dispersion wavelength of 1298 nm was designed to compare SC-generated in the normal dispersion region and anomalous dispersion region. The normal color of the pump center wavelength near the zero dispersion wavelength of the fiber was theoretically analyzed. The numerical results show that in the anomalous dispersion region near the zero dispersion wavelength, the band width is 1418 nm ~ 2 dB and the flatness is 42 dB. Secondly, in order to study the relationship between the dispersion characteristics of photonic crystal fiber and its structural parameters, two methods of designing photonic crystal fiber parameters are used: to keep the ratio of hole diameter to hole spacing unchanged and to change the hole diameter; The geometric structure of the fully normal dispersive photonic crystal fiber is obtained by numerical calculation by changing the ratio of the hole diameter to the hole spacing by keeping the hole spacing unchanged. In order to study the generation of supercontinuum spectrum of photonic crystal fiber pumped by femtosecond pulse in normal dispersion region, a fully normal dispersive photonic crystal fiber is designed, and the supercontinuum spectrum generated by femtosecond pulse pumping in the fiber is numerically calculated. The bandwidth of the spectrum is 1131nm and the flatness is good. The influence of the input pulse peak power and the initial width on the supercontinuum spectrum is also studied. A fully normal dispersive photonic crystal fiber with partial air hole filled liquid material is designed. In this paper, liquid oil is selected as the material. The results show that the dispersion curve is flat in the wavelength range of 1000-2000nm. The generation of the supercontinuum spectrum in the designed photonic crystal fiber is simulated. The resulting supercontinuum spectrum ranges from 918nm to 2295nrn, and the flatness of the whole optical fiber is good in the spectrum range.
【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】：2015
【分類號】：TN253

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

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