光信号在色散光纤中的传输特性
毕业论文关键词：光纤损耗 光纤色散 色散补偿
Optical signal transmission characteristics of the dispersion fiber
Abstract: In 1966, Charles K. Kao proposed using quartz fiber as a new communications medium opened ,the era of fiber-optic communications. With the advent of the information age, the development of optical communication technology increasingly highlighted its irreplaceable role, and optical transmission technology for fiber optic communication has a pivotal role. However, the optical signal transmitted will be accompanied by fiber dispersion and loss, they are two important factors affecting the optical fiber transmission. When optical signal transmitted in fiber, along with the transmission distance increasing, the light of different components in transmission, delays are caused by different pulse stretching so wide phenomenon, which is called the fiber dispersion. Dispersion on the bandwidth of the fiber, while the bandwidth determines the size of the optical fiber transmission information capacity. When the optical fiber transmission amount of information increases, the fiber dispersion will increase, which will result in the error rate optical fiber transmission increasing. This paper studies the optical signal transmission characteristics of the dispersion in the fiber, and introduced modern technology and its development direction of dispersion compensation.
Keywords:Fiber loss fiber dispersion Dispersion Compensation
目录 3
1绪论 5
1.1 光纤色散的概述 5
1.2 光纤色散的分类 5
1.2.1波长色散 5
1.2.2 模式色散 7
1.2.3偏振模色散 7
2光信号在光纤中的传输特性 7
2.1损耗特性 8
2.1.1吸收损耗 8
2.1.2散射损耗 9
2.1.3辐射损耗 10
2.2色散特性 10
2.2.1群速度与群时延[5] 11
2.2.2光脉冲色散展宽[6] 11
2.2.3光脉冲的色散啁啾效应 12
3色散及损耗的测量 12
3.1色散的测量 12
3.1.1相移测量法 13
3.1.2干涉测量法 14
3.2损耗的测量 14
4 色散的补偿 15
4.1后补偿技术 15
4.2预补偿技术 15
4.3在线补偿技术 16
4.4色散补偿技术的发展方向[13] 17
5结束语 18
参考文献 19
1绪论
1.1 光纤色散的概述
色散与损耗两者都是光信号在光纤中传输的主要影响因素。
损耗是导致光信号的振幅逐渐降低的原因，影响这无中继传输的距离。由于光纤制造技术的逐步完善，尤其是这些年来掺饵光纤放大器的应用很好的弥补了光功率的损耗，使得损耗这个限制因子不在是影响光纤传输的主要因素，因此光纤的色散特性逐步成为影响光纤传输的最主要的因素。
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