光纤拉曼放大器在光纤通信系统中的性能研究
发布时间：2018-09-19 18:58
【摘要】：随着信息化社会的发展,将人们从时空的束缚中得以解放。通信在整个社会的发展中扮演着不可忽略的角色。而光纤通信以其低干扰、大容量,长距离、低损耗等优势承载着通信的骨干网络。 随着光纤通信系统的传输距离不断增长,为了克服光纤自身的衰减损耗,要求必要的提高信号进入光纤的初始光功率,但功率越高受激拉曼散射效应越明显,对系统性能影响越大。因此以掺铒光纤放大器为主要代表的中继放大器,在一定程度上缓解了功率矛盾。然而,掺铒光纤放大器存在着成本高、带宽窄等缺点。 此时,光纤拉曼放大器,以其低成本、非线性失真小,增益带宽几乎无限,输出功率高饱和,相对其他系统构造简单等优势,成为了长距离、大容量的密集波分复用系统广泛使用的理想技术。拉曼放大器,以受激拉曼散射效应为放大原理,以系统光纤作为放大介质,利用高功率的短波长光波作为泵浦对长波长、低功率信道的信息光波进行全程放大。泵浦在对信号放大时,并非等增益放大,而是受很多因素的影响,呈现出波动状态,所以要求光纤通信系统在对放大信号的同时还需要考虑到信号增益的平坦化,使其信号在接收端的接收功率总体平稳。 本文主要的研究重点如下：第一,在广泛汲取前人对外拉曼放大相关研究基础上,以光纤拉曼放大器系统的特点和应用为重点,介绍了拉曼放大器的工作原理和特性,引入拉曼放大器的理论模型,分析了系统放大增益与系统参数(信号初始功率,泵浦功率,光纤距离等)之间的关系。第二,深入分析了光纤通信系统的噪声,建立相关噪声的理论模型,并对双重瑞利背向散射噪声作了详细的分析和研究,从理论上验证了前人的实验结果,得到了噪声对系统影响以及与系统参数之间的数学关系。第三,以光纤拉曼放大器的传输耦合方程为基础,数值分析了泵浦及信号功率沿光纤的分布,借助改进的粒子群优化算法对放大系统的增益平坦度进行了优化,使得系统增益波动从3dB提高到0.5dB。
[Abstract]:With the development of information society, people will be liberated from the bondage of time and space. Communication plays an important role in the development of the whole society. Optical fiber communication has the advantages of low interference, large capacity, long distance and low loss. With the increasing transmission distance of optical fiber communication system, in order to overcome the attenuation loss of fiber itself, it is necessary to increase the initial optical power of the signal into the fiber, but the higher the power is, the more obvious the stimulated Raman scattering effect is. The greater the impact on system performance. Therefore, the relay amplifier, mainly represented by erbium-doped fiber amplifier, alleviates the power contradiction to some extent. However, erbium-doped fiber amplifiers have some disadvantages, such as high cost and narrow band. In this case, fiber Raman amplifiers, with their advantages of low cost, low nonlinear distortion, almost infinite gain bandwidth, high output power saturation and simple construction compared with other systems, have become long distances. Ideal technology widely used in large capacity dense wavelength division multiplexing systems. Raman amplifiers take stimulated Raman scattering (SRS) as amplification principle, system optical fiber as amplification medium and high power short wavelength optical wave as pump to amplify the long wavelength and low power channel information light wave. When pumping amplifies the signal, it is not equal gain amplification, but is affected by many factors, so the optical fiber communication system should consider the flatness of the signal gain while amplifying the signal. The received power of the signal at the receiving end is generally stable. The main research points of this paper are as follows: first, based on the previous researches on Raman amplifiers, the principle and characteristics of Raman amplifiers are introduced based on the characteristics and applications of optical fiber Raman amplifiers (FRAs). The theoretical model of Raman amplifier is introduced to analyze the relationship between system gain and system parameters (signal initial power, pump power, fiber distance, etc.). Secondly, the noise of optical fiber communication system is deeply analyzed, the theoretical model of correlated noise is established, and the double Rayleigh backscattering noise is analyzed and studied in detail. The influence of noise on the system and the mathematical relationship between noise and system parameters are obtained. Thirdly, based on the transmission coupling equation of fiber Raman amplifier, the distribution of pump and signal power along the fiber is numerically analyzed, and the gain flatness of the amplification system is optimized by the improved particle swarm optimization algorithm. The system gain fluctuation is increased from 3dB to 0.5 dB.
【学位授予单位】：西安邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN722;TN929.11
本文编号：2251029
[Abstract]:With the development of information society, people will be liberated from the bondage of time and space. Communication plays an important role in the development of the whole society. Optical fiber communication has the advantages of low interference, large capacity, long distance and low loss. With the increasing transmission distance of optical fiber communication system, in order to overcome the attenuation loss of fiber itself, it is necessary to increase the initial optical power of the signal into the fiber, but the higher the power is, the more obvious the stimulated Raman scattering effect is. The greater the impact on system performance. Therefore, the relay amplifier, mainly represented by erbium-doped fiber amplifier, alleviates the power contradiction to some extent. However, erbium-doped fiber amplifiers have some disadvantages, such as high cost and narrow band. In this case, fiber Raman amplifiers, with their advantages of low cost, low nonlinear distortion, almost infinite gain bandwidth, high output power saturation and simple construction compared with other systems, have become long distances. Ideal technology widely used in large capacity dense wavelength division multiplexing systems. Raman amplifiers take stimulated Raman scattering (SRS) as amplification principle, system optical fiber as amplification medium and high power short wavelength optical wave as pump to amplify the long wavelength and low power channel information light wave. When pumping amplifies the signal, it is not equal gain amplification, but is affected by many factors, so the optical fiber communication system should consider the flatness of the signal gain while amplifying the signal. The received power of the signal at the receiving end is generally stable. The main research points of this paper are as follows: first, based on the previous researches on Raman amplifiers, the principle and characteristics of Raman amplifiers are introduced based on the characteristics and applications of optical fiber Raman amplifiers (FRAs). The theoretical model of Raman amplifier is introduced to analyze the relationship between system gain and system parameters (signal initial power, pump power, fiber distance, etc.). Secondly, the noise of optical fiber communication system is deeply analyzed, the theoretical model of correlated noise is established, and the double Rayleigh backscattering noise is analyzed and studied in detail. The influence of noise on the system and the mathematical relationship between noise and system parameters are obtained. Thirdly, based on the transmission coupling equation of fiber Raman amplifier, the distribution of pump and signal power along the fiber is numerically analyzed, and the gain flatness of the amplification system is optimized by the improved particle swarm optimization algorithm. The system gain fluctuation is increased from 3dB to 0.5 dB.
【学位授予单位】：西安邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN722;TN929.11
【参考文献】
相关期刊论文 前3条
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2 王晓丽;张学良;温淑花;卢青波;;一种改进的粒子群优化算法[J];机械工程与自动化;2008年04期
3 巩稼民;平璐;李瑞;;在同种光纤中实现RFA增益平坦化的方法[J];应用光学;2012年03期
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