Research On PMD Compensation Technology In Optical Fiber Communication

At present, polarization mode dispersion (PMD) has become an important limiting factor for the performance of long distance transmission, high rate data and analog communication systems. Further more, as the bit-rate of a single channel in optical fiber transmission approaches 40Gbit/s or beyond, the effect of PMD can't be neglected. It makes the intersymbol interference and corrupts severely the performance of the system. Because of the impact of the circumstance, PMD shows statistical characterization. It makes the compensation of PMD become difficult and PMD was considered the final factor of the optical communication.According to the research status in China as well as in the world, it is crucial to carry on the research on PMD for improving the domestic high bitrate optical fiber communication technology. First, a summary of the relating concepts of PMD and its statistics nature was given in this paper. Then analyses description method on PMD and techniques for PMD measurement and compares their advantages and disadvantages. An expression of PMD-induced pulse broadening was derived based on principal state polarization (PSP), which is the description for first-order PMD; then discussed the deterioration of receiver's sensitivity caused by PMD and the effect of PMD on RF spectrum at the receiver.The focus topic of this thesis is the PMD compensation technology. We first present the principle of first-order PMDC and a general model of PMDC. On this foundation, analyses and compares every feedbake of the automatism compensation system for compensating the PMD such as DOP, the power in a narrow-band or tones of the radio-frequency(RF), the eye-opening and BER. Then describe each sub-model, respectively, and give a summary.We analyse the compensation technology and compare their advantages and disadvantages. In order to compensate the system of high-speed optical communication link, we set up an integrated emulational model of the optical communication link and have a brief analysis of the model.