本文關鍵詞： 光纖通信 少模光纖 模式復用 模式耦合 模間色散　出處：《北京郵電大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著骨干光纖傳輸系統(tǒng)中通信技術的不斷演進以及寬帶網(wǎng)絡中高速大容量數(shù)據(jù)業(yè)務的井噴式增長,全球通信系統(tǒng)對于傳輸容量的需求每年都在呈指數(shù)形式增長。然而,近期的研究結果表明,由于單模光纖非線性效應的影響以及高速光傳輸系統(tǒng)中對信號傳輸光信噪比的要求,利用波分復用技術的單模光纖的傳輸容量正在快速接近其香農(nóng)極限,因此必須考慮采用新的復用技術來突破現(xiàn)有的技術瓶頸,增加頻譜效率,滿足日益增長的網(wǎng)絡需求�；谏倌９饫w的模式復用技術作為一種新興的光多輸入多輸出傳輸方案就是在這種大的背景下發(fā)展而來,利用的是少模光纖中的限定模式分別承載信號,實現(xiàn)光纖傳輸容量成正比例的提成,成為了未來高速大容量光傳輸系統(tǒng)的關鍵技術之一。在模式復用系統(tǒng)中,由于工作環(huán)境不理想導致的傳輸光纖的折射率擾動可引起不同光纖模式間的耦合,并導致傳輸光場的場強與相位分布發(fā)生隨機變化以及不同信息光路的色散時延。此外模式復用系統(tǒng)中仍存在諸多重要的理論和技術問題有待研究解決,例如模式復用關鍵器件的實現(xiàn),模式耦合及色散效應的抑制,不同串擾情況下的少模光纖構造設計等。本文就是通過重點研究模式復用中的隨機模間耦合和傳輸模式特性進行的少模模式復用技術的前沿研究。 本文從基本理論出發(fā),重點研究了新型少模光纖在模式復用系統(tǒng)中的應用特性,通過推導麥克斯韋方程組分析了少模光纖中作為復用技術基礎的信息承載模式的相關特性,并在特定弱導少模光纖條件下,提出了可描述模式耦合以及模間色散的參數(shù)化物理模型,仿真分析了利用基模LP01與高階模式LP11作為模式復用承載信道的可能性與優(yōu)越性。同時,從波導光學的傳輸特性出發(fā),設計了一種具有相反色散斜率的多階躍折射率的少模光纖,作為模式復用系統(tǒng)的傳輸介質(zhì),組成了具有實時補償色散影響的四跨段傳輸鏈路,通過直接探測的模式復用系統(tǒng)仿真分析驗證了采用此種方案對傳輸容量為3*10Gb/s的模式復用系統(tǒng)在傳輸距離達20.4km的情況下,可有效將傳輸末端的色散總值控制在111ps以下,并研究分析了模式耦合以及模間色散對系統(tǒng)高性能的綜合影響。論文的具體工作安排如下： 首先,研究了少模光纖的基本特性,從麥克斯韋方程組出發(fā),詳細推導了少模光纖中的光傳輸特性,分析不同模式的光場場強分布,以及決定光纖中傳輸模式特性的結構重要參數(shù),并研究模式復用技術的理論基礎。 其次,從耦合模理論出發(fā),得到不同模式在特定結構下需要滿足的耦合模方程,采用光纖分段以及軸向偏移的結構來模擬的少模光纖的由于制作環(huán)境缺陷以及光纖微彎帶來的模式耦合以及模間色散效應,結合矩陣傳輸理論建立少模光纖的場耦合模型。為后續(xù)構建少模模式復用系統(tǒng)提供了理論模型。 再次,對少模光纖模式復用系統(tǒng)的基本模型進行分析探討,研究模式復用系統(tǒng)中需要解決的關鍵技術以及構成系統(tǒng)所需的關鍵問題,詳細比對分析不同的優(yōu)缺點,重點介紹少模光纖設計技術,并提出設計了一種適用于模式復用系統(tǒng)的可具有相反色散斜率的少模光纖,使其作為模式復用系統(tǒng)的傳輸介質(zhì)的同時能夠?qū)崟r補償傳輸過程中累積的色散影響。 最后,采用可具有相反色散斜率的少模光纖段,組成傳輸距離達20.5km四跨段的傳輸鏈路,建立結合模式耦合及模間色散的參數(shù)化物理仿真模型,并構建直接探測的模式復用系統(tǒng),仿真分析其系統(tǒng)傳輸性能。
[Abstract]:In recent years, with the blowout of high speed and large capacity data communication business evolving technology backbone optical transmission systems and broadband network growth, global demand for transmission capacity of the communication system in every year grows exponentially. However, recent research shows that due to the effect of single-mode fiber nonlinear effect and high speed optical transmission the system on signal transmission in the optical signal-to-noise ratio, the transmission capacity of single mode fiber by using wavelength division multiplexing technology is fast approaching the Shannon limit, so we must consider the reuse of new technology to break the bottleneck of existing technologies, increase the spectrum efficiency, meet the growing demand of network. And the mode division multiplexing mode fiber is a new kind of optical multiple input multiple output transmission scheme is developed in this context is based on the use of few mode fiber in the limit mode Are bearing signals, realize the optical fiber transmission capacity is proportional to the Commission, has become one of the key technologies for future high-speed large capacity optical transmission system. The mode multiplexing system, the work environment is not ideal due to the disturbance rate caused by optical fiber can cause different refractive coupling between optical fiber mode, and lead to the transmission of the light field intensity with the change of phase distribution and different information optical dispersion delay. In addition mode multiplexing system there are still many important theoretical and technical problems to be solved, such as the key device to realize mode multiplexing, suppression of mode coupling and dispersion effect, different crosstalk under the condition of few mode fiber structure design research. Less mode multiplexing technology this paper is focused on by the random mode coupling and mode multiplexing transmission mode characteristics.
From the basic theory, focuses on the application of new characteristics of few mode fiber in mode division multiplexing system, related characteristics as the basis of multiplexing information bearing mode in few mode fiber are analyzed by deriving the Maxwell equations, and in particular the weakly guiding few mode fiber under the conditions proposed can describe the mode coupling and mode the dispersion between the parametric physical model, simulation analysis as a model and the superiority of channel multiplexing bearing the possibility of using the base model LP01 and high-order LP11 model. At the same time, starting from the transmission characteristics of optical waveguide, a design with opposite dispersion slope multi step index few mode fiber as the transmission medium, mode multiplexing system, composed of four segment transmission links with real-time influence of dispersion compensation, through the analysis of the direct detection of the mode multiplexing system is verified by simulation using this scheme for transmission The capacity of 3*10Gb/s in mode division multiplexing system transmission distance of 20.4km, which can effectively control the transmission end of the dispersion value below 111ps, and analyzed the influence of mode coupling and integrated mode dispersion of high performance system. The specific arrangement of the thesis are as follows:
Firstly, study the basic characteristics of few mode fiber, starting from the Maxwell equations, deduced the optical transmission characteristics of few mode fiber in the analysis of the optical field intensity distribution of different modes, as well as an important parameter to decide the structure characteristics of the optical fiber transmission mode, and mode of complex theoretical foundation for technology.
Secondly, based on the coupled mode theory, different models need to satisfy the coupled mode equations in specific structure, the fiber section and the axial offset structure to simulate the production environment because of few mode fiber defects and micro bending optical fiber mode coupling and mode brings color dispersion effect, combined with the transfer matrix theory to establish coupling model less mode fiber. Provides a theoretical model of few mode multiplexing system for subsequent construction.
Again, the analysis of the basic model of few mode fiber mode multiplexing system, key research needs to solve the key technical problems in the system and mode multiplexing system required, with comparison and analysis of different advantages and disadvantages, focuses on the few mode fiber design technology, and design a suitable mode multiplexing system can in contrast with the dispersion slope of few mode fiber, the dispersion effect as the transmission medium mode multiplexing system to the accumulation process of real-time compensation in the transmission.
Finally, using few mode fiber segments with opposite dispersion slope of the transmission link consists of transmission distance up to 20.5km cross section, a combination of parameterized physical simulation model of mode coupling and mode dispersion, and construct the mode multiplexing system of direct detection, simulation analysis of the transmission performance of the system.

【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.11

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本文編號：1495978