【作者】 黄山；

【导师】 赵华凤；

【作者基本信息】 清华大学 ， 电子科学与技术， 2004， 硕士

【摘要】 随着光纤通信传输速率和距离的不断增加,原来在光纤通信系统中不太被关注的偏振模色散(PMD)问题日显突出并引起广泛的关注,PMD已成为当前发展高速(10Gb/s 或更高)长距离光纤传输系统的主要限制因素。光纤链路中的PMD统计特性、PMD导致的信号失真以及PMD测量与补偿技术研究是目前光纤通信领域研究的热点和前沿之一。论文主要工作是研制用于“863”项目“光纤偏振模色散自适应补偿系统”试验的模拟器。论文对保偏光纤的温度特性进行了测试,对基于温度效应的偏振模色散模拟器进行了理论分析和仿真,完成了一套性能指标符合课题要求的模拟器。论文的主要成果和创新为:设计了单根高双折射光纤的温度特性的测量方法。该方法利用琼斯矩阵测量装置,通过计数输出光强的变化周期数,能够计算出光纤的温度敏感性参数,为模拟器的设计制作打下了基础。以高双折射光纤级联模型为基础,利用温度对光纤双折射特性的影响,建立了温度效应的PMD模拟器的模型,并进行了仿真。仿真结果表明:模拟器的DGD分布规律由级联段数决定,平均DGD由级联光纤总DGD决定。完成了一套8段45o焊接的温度效应模拟器,结构简单,核心部分没有偏振控制器等机械部件。其DGD平均值为30ps,概率密度基本符合麦克斯韦分布,能够产生二阶PMD,自相关函数正交散落。模拟器达到了“863”课题要求,并应用于PMD自适应补偿系统试验中。该项目已于2003年12月通过“863”专家组验收。更多还原

【Abstract】 With the increase in the bitrate and the transmission distance of optical fiber communication, polarization mode dispersion (PMD) has become of interest, and is regarded as a severe and ultimate limitation on high-speed long haul optical transmission with a bitrate of 10Gbit/s or higher. Study on PMD statistics and PMD-induced distortions, as well as PMD measurement and compensation techniques, is not only one of the frontiers in the field of optical fiber communication but also a significant topic related to high-speed and long-haul optical transmission.In the present dissertation, a PMD emulator is produced to serve the National High-Tech Project Self-adapted PMD compensation system. The temperature characteristics of High-birefringence fibers are measured. A novel model is derived to describing and simulating temperature-based PMD emulator. The temperature-based PMD emulator fits the performance index well.With Jones Matrix measurement device, through counting the periods of output light intensity changing, the temperature sensitivity of a single high-birefringence fiber is calculated. The sensitivity is a key parameter in simulation and emulator design.With the parameter of temperature sensitivity of high-birefringence fiber, a novel model describing temperature-based PMD emulator is derived. Simulation shows that DGD probability density function of the emulator is decided by how many high-birefringence fiber parts are connected and the average DGD of the emulator is decided by total DGD of connected fiber parts.A temperature based PMD emulator is produced with 30 ps average DGD and Maxwellian distribution. The emulator structure is very simple with no polarization controller at key design. Besides, it can generate second order PMD with autocorrelation function quadratic <WP=5>falloff. It fits the project performance index and is used in the compensation system. The project has been checked out by experts on December 2003.更多还原