【作者】 孙丹；

【导师】 张晓光；

【作者基本信息】 北京邮电大学 ， 物理电子学， 2007， 硕士

【摘要】 偏振模色散(PMD)被认为是限制10Gb／s以上光纤通信系统长距离传输的重要因素之一，是目前光纤通信领域的一个研究热点。反馈控制单元室偏振模色散自适应补偿系统中最关键的组成部分，反馈控制单元的模块化是偏振模色散自适应补偿器实用化的最重要的一步。本论文讨论了基于DSP的PMD补偿逻辑控制模块的软件设计与实现，特别是编写了系统初始化程序、链接命令文件、A／D转换程序、D／A转换程序、粒子群优化(PSO)算法处理程序、系统引导装载程序等，并实现了基于DSP的PMD补偿相关实验。本论文的主要工作如下(黑体部分为创新性工作)：◆简明扼要的回顾和总结了PMD的起因、PMD补偿技术、自适应逻辑控制单元的设计要求。◆详细分析了已有的PMD补偿系统中的逻辑控制模块的优、缺点，提出了基于DSP的PMD补偿系统逻辑控制模块的实现方案，并给出了基于DSP的逻辑控制模块硬件系统总体设计。◆分析了基于TMS320VC33的寻址方式和指令集，并结合TMS320VC33的系统资源，编写了链接命令文件和系统初始化文件。◆深入分析了A／D芯片的特性和PMD补偿系统要求，编写了A／D转换子程序和中断服务子程序。还深入分析了D／A芯片的特性，根据PMD补偿系统要求，编写了D／A转换子程序。◆详细阐述了PSO技术作为偏振模色散补偿控制算法的工作原理以及拓扑结构，编写了PSO(包括GPSO和LPSO)算法处理程序，并在DSP系统上的调试成功，实现了PSO算法在DSP系统中的移植。◆提出了利用FLASH实现TMS320VC33芯片系统程序引导装载方法，编写了FLASH擦除和烧写程序，实现了DSP系统的用户程序加载。◆重点设计了我们完成的几个有代表性的实验，包括：A／D模块采集模拟信号实验、A／D模块采集光纤链路中偏振度(DOP)信息曲面图实验、D／A模块控制光纤链路中偏振控制器的实验、拟合DOP椭球实验。实验验证了我们设计的DSP系统性能完全能够达到PMD补偿逻辑控制单元的要求。◆首次将DSP技术应用于PMD补偿系统，将基于DSP的逻辑控制模块用于光纤通信系统中一阶、二阶PMD补偿实验，获得了成功。实验结果表明：将基于DSP的逻辑控制模块用于光纤通信系统的PMD补偿时，达到了预期补偿效果，有利于实现PMD补偿系统的集成化和实用化。更多还原

【Abstract】 Polarization mode dispersion (PMD) is considered to be one of the main obstacles for long-haul optical fiber communication systems with the speed beyond 10Gb/s. Therefore, it has been a hot topic in recent years. Feedback control unit is the most important part in adaptive PMD compensation systems.The modularization of feedback control unit is the most important one-step for the practicability of adptive PMD compensator. Software design and realization of logic control unit based on DSP for PMD compensation systems is discussed, especially system initialization programs, linker command file, A/D conversion programs, D/A conversion programs, Particle Swarm Optimization(PSO) algorithm processing program, system boot loading program are also discussed. In addition, the adaptive PMD compensation experiments based on DSP are realized in optical communication system. The research works in the dissertation are summarized as follows:The origin of PMD, techniques in PMD compensation, design requirements for adaptive logic control unit are reviewed and summarized compendiously.The advantages and disadvantages of established logic control unit for PMD compensation system are analyzed. For the first time, the collectivity scheme for the logic control unit using DSP technique in PMD compensation systems is proposed and hardware collectivity design mothod based on DSP is given.The foundation of software development for DSP application system is analyzed in detail, especially addressing mode and instruction set of TMS320VC33.Combined with the system resources, linker command file and system initialization program are coded.Combined with the performance of A/D and the requirements of PMD compensation system, A/D conversation program and interrupt service program are coded. Similarly, D/A conversation program are coded.PSO was introduced in PMD compensation. The mechanism of PSO is presented in detail, and their topologic structures are analyzed. Coding and debugging for PSO(including GPSO and LPSO) algorithm processing program in DSP system is successful completed.Realizing boot loading using FLASH for TMS320VC33 is analyzed in detail. Erasure and loading codes for FLASH is successful completed. Accordingly, user’s program boot loading is realized.To confirm the validity of the logic control unit based on DSP, a series of experiments are completed, including acquisition analog signals for A/D module, acquisition DOP information for A/D module, D/A module controlling polarization controller, DOP ellipsoid data fitting experiments.The first and the second PMD compensation experiments are successfully completed using the logic control unit based on DSP. The results of the experiments show that the DSP system has the better capability in PMD compensation systems. It helps PMD compensation system integrated and practical.更多还原