【作者】 吴兆喜；

【导师】 黄元庆；

【作者基本信息】 厦门大学 ， 测试计量技术及仪器， 2008， 博士

【摘要】 波长转换技术在光纤通信中有着广泛的应用,尤其是在基于波分复用的全光网络中将发挥关键性的作用。通过波长转换技术,可以提高波长的利用率,有效地解决网络中的阻塞问题,简化网络管理,增强网络对故障的适应能力。基于半导体光放大器的波长转换器具有结构简单、容易实现等优点,因此成为近年来研究的热点。本文针对半导体光放大器交叉增益调制型、交叉相位调制型和四波混频型波长转换技术进行了深入的理论和实验研究,具体工作如下:1、分析了进行波长转换技术研究的重要意义,较为全面地概述了波长转换器的种类和发展状况。2、详细分析了半导体光放大器用于波长转换的理论基础,建立了比较完善的半导体光放大器用于模拟交叉增益调制型、交叉相位调制型和四波混频型波长转换的静态和动态分段模型,为数值模拟研究奠定了坚实的基础。3、深入研究了半导体光放大器的增益特性,对半导体光放大器交叉增益调制型波长转换的消光比特性、转换效率和输出信噪比等进行了全面的仿真和实验研究,为实现参数优化提供了详细的理论依据。成功实现了1.25Gb/s的波长转换。4、数值模拟了半导体光放大器交叉相位调制型的同相和反相波长转换,重点研究了其输出消光比特性和输入功率动态范围,并提出了有效的优化参数的新方案。5、对半导体光放大器四波混频型波长转换进行了仿真研究,全面考虑了共轭光对四波混频过程的影响,深入研究了其转换效率和输出消光比特性,获得了对四波混频型波长转换技术的更客观的评价与结论。6、首次提出了半导体光放大器交叉增益调制和交叉相位调制级联的波长转换新方案,并进行了数值模拟,所得结果证明了该方案能够同时获得很高的消光比和很大的输入功率动态范围,并且具有很宽的波长转换范围和能实现无波长转换等众多优点。本文的主要创新工作如下:1、首次提出了半导体光放大器交叉增益调制和交叉相位调制级联的波长转换新方案,该方案能够同时获得很高的消光比和很大的输入功率动态范围,并且具有很宽的波长转换范围和能实现无波长转换等众多优点。2、提出了两路探测光输入功率不相等的理论与方案,获得了半导体光放大器交叉相位调制型的波长转换的优化参数,该方案比传统的交叉相位调制型波长转换具有更高的输出消光比和更大的输入功率动态范围。3、采用半导体光放大器交叉增益调制型波长转换的输入输出特性曲线来分析交叉增益型波长转换的输出消光比特性,该方法较其它方法更能直观地揭示交叉增益型波长转换输出消光比退化的现象及其原因。更多还原

【Abstract】 Wavelength conversion technology could be widely used in optical fiber communication, it will play the key role especially in the all-optical network based on wavelength division multiplexing (WDM). Wavelength conversion can increase the utilization efficiency of wavelengths, efficiently solve the blocking problem in the networks, simplify the management of the networks, enhance the adaptability to failure of the networks. Wavelength converter based on semiconcuctor optical amplifiers (SOAs) has become a research hotspot in recent years due to its advantages of simple configuration and easy realization.In this dissertation, we focus on the wavelength conversion based on cross-gain modulation (XGM), cross-phae modulation (XPM) and four-wave mixing (FWM), several theoretical and experimental studies has been carried out as follows:1. The research signification of wavelength convertion is analyzed. Many kinds of wavelength converters and their development status are summarized.2. The theoretical basis of wavelength conversion based on SOAs is investigated. The static and dynamic model of SOA, which are used to simulate the wavelength conversion based on XGM, XPM and FWM, is established.3. An in-depth study on the gain characteristics of SOA is carried out. Several properties of wavelength conversion based on XGM in SOA, such as output extinction ratio (ER), conversion efficiency, output signal-to-noise ration (SNR), are studied theoretically and experimentally. The results provide detail gists for parameters optimization. 1.25Gb/s wavelength conversion based on XGM in SOA is achieved. 4. Numerical simulation of both in-phase and out-of-phase wavelength conversion based on XPM in SOA is carried out, the study focus on the output ER characteristic and the input power dynamic range. An effective new scheme to optimize the parameters is proposed.5. Numerical simulation of the wavelength conversion based on FWM in SOA is carried out, and the effects of the satellite light are considered. An in-depth study on the conversion efficiency and the output ER characteristic is carried out. More impersonal evaluations and conclusions are obtained.6. A new scheme of wavelength conversion based on the cascade of XGM and XPM in SOAs is proposed for the first time. The new scheme has many advantages, such as both high ER and large input power dynamic range, broad conversion band and can realize no-conversion operation, which are proved by the simulation results.The innovations of this dissertation are as follows:1. A new scheme of wavelength conversion based on the cascade of XGM and XPM in SOAs is proposed for the first time. The new scheme has many advantages, such as both high ER and large input power dynamic range, broad conversion band and can realize no-conversion operation.2. A new theory and scheme in which the iuput powers of the two probe beam are not the same is proposed. Based the scheme, the parameters optimization is achieved and results in larger ER and larger input power dynamic range.3. The output ER characteristic of the wavelength coversion based on XGM in SOA is analysed throuth the in-out characteristic curve. This method can open out the degeneration of ER and its causation more intuitively than other methods.更多还原