Software Design And Realization Of Logic Control Unit Based On DSP In Adaptive Polarization Mode Dispersion Compensation Systems

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.