本文選題：啁啾光纖光柵 + 光學特性��； 參考：《江南大學》2014年碩士論文

【摘要】：隨著光通信產(chǎn)業(yè)的迅猛發(fā)展，光纖光柵是近年來發(fā)展最為迅速的光無源器件之一，而啁啾光纖光柵具有非線性小、插入損耗低、結構緊湊和能兼容光纖等優(yōu)勢，在光通信領域應用非常廣泛。因此，逐步解決光纖光柵目前在光通信理論和應用中所存在的各類關鍵問題必將會給光纖通信領域帶來巨大的改變。本文主要針對光纖光柵的光學特性和高速傳輸系統(tǒng)中的色散補償進行了詳細闡述。 首先，論文詳細介紹了光纖光柵(FBG)的分類和基本理論。以耦合模理論為基礎，利用傳輸矩陣法，詳細分析了不同參數(shù)下的均勻光纖光柵(UFBG)、切趾光纖光柵和啁啾光纖光柵(CFBG)的光學特性。從中可以分析到，光纖光柵反射率、邊模抑制比受光纖光柵長度、折變量和啁啾系數(shù)的影響規(guī)律。與光柵長度和啁啾系數(shù)相比，光柵折變量的數(shù)值對3dB帶寬的影響很大。另外，針對啁啾光纖光柵進行了變跡處理，使用兩種常用的變跡函數(shù)獲得了較理想的光學特性，在此基礎上構造了一種新的變跡函數(shù)，與兩種常用的變跡函數(shù)進行對比分析。通過對比發(fā)現(xiàn)，采用新的變跡函數(shù)進行變跡之后的啁啾光纖光柵的光學特性最理想。 接著，，從理論上簡要分析了單模光纖中的色散，光纖的總色散是由材料色散、波導色散和折射率分布色散組成。利用Optisystem軟件設計了高速傳輸系統(tǒng)的色散補償仿真實驗圖，對比了前置色散補償、后置色散補償和對稱色散補償三種色散補償方式對高速傳輸系統(tǒng)的色散補償效果，同時分析了三種色散補償方式下的誤碼率與入纖功率的關系。當入纖功率較小時，信噪比比較差，誤碼率也會比較高；隨著入纖功率的增加，噪音相對信號變小了，因此系統(tǒng)的信噪比也隨著增加了，誤碼率也隨之變小了；但是隨著光功率不斷的增加，非線性對系統(tǒng)的影響越來越大，誤碼率也隨之變大。 最后，設計了一個40/100/160Gb/s的光纖傳輸系統(tǒng)，通過對不同的速率、傳輸距離、占空比、脈沖形狀和不同的傳輸模式對光纖傳輸系統(tǒng)的三階色散(TOD)效應影響的分析，得出了三階色散導致脈沖展寬，脈沖邊緣產(chǎn)生震蕩，同時脈沖中心會產(chǎn)生時域偏移，隨著速率的增加，脈沖中心時域偏移也會變大，脈沖中心時域偏移也受占空比、脈沖形狀和光纖類型影響。
[Abstract]:With the rapid development of optical communication industry, fiber grating is one of the most rapidly developing optical passive devices in recent years, and chirped fiber grating has the advantages of small nonlinearity, low insertion loss, compact structure and compatible optical fiber. It is widely used in the field of optical communication. Therefore, gradually solving all kinds of key problems existing in optical communication theory and application of fiber Bragg grating will bring great changes to the field of optical fiber communication. The optical properties of fiber gratings and dispersion compensation in high-speed transmission systems are discussed in detail in this paper. Firstly, the classification and basic theory of FBG are introduced in detail. Based on the coupled mode theory, the optical properties of uniform fiber grating (UFBG), apodized fiber grating (FBG) and chirped fiber grating (CFBG) with different parameters are analyzed in detail by using the transfer matrix method. It can be concluded that the reflectivity of fiber grating and the ratio of side mode suppression are affected by the length of fiber grating, the refractive variables and the chirp coefficient. Compared with the grating length and chirp coefficient, the value of the grating refractive variable has a great influence on the 3dB bandwidth. In addition, the chirped fiber gratings are apodized, and the ideal optical properties are obtained by using two kinds of commonly used apodization functions. On this basis, a new kind of apodization function is constructed and compared with the two kinds of commonly used apodization functions. By comparison, it is found that the chirped fiber grating with a new apodization function is the most ideal. Then, the dispersion in single-mode fiber is analyzed in theory. The total dispersion is composed of material dispersion, waveguide dispersion and refractive index distribution dispersion. The simulation diagram of dispersion compensation for high speed transmission system is designed by using Optisystem software. The dispersion compensation effects of three dispersion compensation modes, namely precompensation, post compensation and symmetrical compensation, are compared. At the same time, the relationship between BER and fiber power under three kinds of dispersion compensation methods is analyzed. When the input power is small, the signal-to-noise ratio (SNR) is poor, and the bit error rate (BER) will be higher. With the increase of the input power, the relative noise signal becomes smaller, so the signal-to-noise ratio of the system increases with the increase of the SNR, and the bit error rate becomes smaller. However, with the increasing of optical power, the influence of nonlinearity on the system becomes more and more, and the bit error rate becomes larger. Finally, a fiber optic transmission system based on 40/100/160Gb/s is designed. The effects of different rates, transmission distance, duty cycle, pulse shape and transmission mode on the third order dispersion (Tod) effect of optical fiber transmission system are analyzed. It is concluded that the third-order dispersion results in pulse broadening, pulse edge oscillation and pulse center migration. With the increase of the rate, the pulse center time-domain migration will also become larger, and the pulse center time-domain migration will also be duty cycle. Pulse shape and fiber type influence.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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