Abstract
As bit-rate in optical fiber communications system increases to 4OGbit/s or beyond in single channel, polarization mode dispersion (PMD), especially higher-order PMD, has become one of major obstacles in high-speed and long-distance transmission systems. Therefore, it is obvious that there are two ways to think of higher-order PMD, one is to investigate that how the higher-orderPMD affect system performance and its critical limitation value; the other is to find effective methods to mitigate or compensate higher-order PMD to improve system performance. Therefore, in this paper, firstly a detailed discussion will focus on the system impairment due to higher-order PMD, secondly, a improved first-order PMD compensation method is proposed to compensate part of higher-order PMD and checked with numerical simulation.
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