【作者】 任志君；

【导师】 王晶；

【作者基本信息】 中国海洋大学 ， 光学工程， 2003， 硕士

【摘要】 色散缓变光纤(DDF)作为一种新型的特种光纤，有着不同于常规光纤的特殊性能和用途，尤其在光脉冲压缩和调制不稳定性产生孤子脉冲串方面显示出突出的优越性，受到国内外学者的关注。 本文理论上推导了DDF中调制不稳定性的增益谱，研究了不同剖面DDF的调制不稳定性，并采用数值方法计算了脉冲在各种剖面的DDF中传输性能。研究结果表明：无论是在脉冲的无畸变稳定传输方面，还是实现脉冲压缩方面，DDF都有着常规光纤所不能比拟的优越性。而且，不同类型的DDF在不同的应用领域各有其优越性，这为实际中趋利避害、更好的发挥不同类型DDF的最佳性能提供了科学依据。 最后，我们还研究了偏振模色散(PMD)对DDF通信系统的影响，发现PMD是影响DDF系统性能的最终限制因素之一，必须想办法加以补偿。更多还原

【Abstract】 Comparing to the common fiber, dispersion decreasing fiber (DDF), which is a new special fiber, has peculiar performance and use. And it has prominent advantage in the aspect of pulse compression and soiiton-chaurs coming into being. So, many scholars pay a lot of attention to DDF research.In this thesis the gain spectrum of modulation instability (MI) is calculated theoretically, and the MI in different DDF is studied. Then pulse’s evolvement in different DDF is simulated by means of numerical method. The results show that the performance of DDF communication system is much better than common fiber in the aspect of not only pulse transmission without aberration but also pulse compression. Moreover, different DDF has respective advantage in different application area. It provides the scientific gist to exert the optimum performance of different type of DDF in practice.In the end, the influences of polarization mode dispersion (PMD) on DDF communication system are studied. It found that PMD is one of the ultimately limiting factors and must be compensated in practice.更多还原