《应用于偏振模色散补偿系统中的前向纠错技术的研究》毕业学术论文.doc

密级： 保密期限： 硕士研究生学位论文 题目：应用于偏振模色散补偿系统中的前向纠错技术的研究 学 号： 　　　 086871 姓 名： 　　 　 专 业： 　 物理电子学 导 师： 　 学 院： 信息光子学与光通信研究院 2011 年 01 月 15 日  Forward Error Correction applied to Polarization Mode Dispersion Compensation System A dissertation submitted to Beijing University of Posts and Telecommunications for Master Degree By Yan Fei Supervised by Prof. Zhang Xiaoguang 2011.01.15 摘 要 光纤通信使高速率、大容量、长距离的通信成为现实和未来发展的趋势。具有损耗低、传输频带宽容量大、体积小、重量轻、抗电磁干扰、不易串音等优点。在光纤通信系统中，早期由于光纤及与系统相关的光电子器件的发展，系统性能优于一般电缆及无线通信，因而无需采用前向纠错（FEC）技术；另一方面由于光传输信息速率相对较高，没有与其匹配的纠错编译码器。直到光传输速率提高到Gb/s，并且光放大延长了无中继传输距离后，一些在短距离、低速率系统中表现不明显的因素如偏振模色散等，限制了系统性能的进一步改善，于是才开始了将FEC应用于光通信系统的研究。低密度奇偶校验码（LDPC codes）Abstract Optical fibre communications have been expected to be a high-speed and high-capacity communication, which has a lot of advantages such as low loss, high spectra capacity, small size, low weight. In the early period, due to the development of optical fibre and relevant optoelectronic equipments and devices, system performance was so good that forward error correction technique was not even needed to be used in fibre communication system, and the relatively faster optical information rate made that error correction did not match the codec with the transmission system. Until the light transmission rate gone up to the Gb/s , and the transmission distance without repeaters had been extended by the applying of optical amplification, some factors such as polarization mode dispersion, were found to be bottleneck in the further improvement of system performance, while these factors in the short-range, low-rate system was not obvious , . So the research of FEC applied in optical communication system started. LDPC code is near the Shannon limit performance of good code and the decoding complexity is relatively low. The polarization mode dispersion compensation and polarization mode dispersion mitigation (FEC) in combination has some t