多芯光纤的串扰特性研究

发布时间：2018-03-01 02:20

本文关键词： 多芯光纤串扰特性沟槽结构光纤耦合模理论功率耦合理论　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着信息技术的发展,通信容量与日俱增。光纤通信由于自身带宽大、速率高、损耗小等优势,成为了未来通信发展的重中之重。要构建实用化的高速、大容量全光通信网,增大光纤有效模场面积、减小光纤色散、扩大光纤的传输容量,是实现高功率大容量传输的必备条件。为提升光纤通信容量,空分复用技术(SDM)被大量采用。SDM技术采用多芯光纤,使光在一根光纤的多个芯子传输,极大地提高了光纤的通信容量,推动着光纤通信产业的发展。多芯光纤作为光纤SDM系统的基础器件,其优劣关乎整体光纤通信系统的性能。因此,本文对多芯光纤进行了详细的研究,主要工作如下:1.利用耦合模理论,对7芯光纤的耦合方程进行了推导,并得出七芯光纤的耦合系数公式。另外,对光纤在长距离传输时的功率耦合理论进行了完整的分析。根据功率耦合理论,研究了当光从不同位置的芯子入射时,各芯子的功率分布情况。2.对多芯光纤的色散、有效模场面积进行了研究。重点分析了沟槽相对宽度、沟槽相对折射率差、沟槽相对位置对光纤的色散及有效模场面积的影响。得出了三个参数在一定范围内能使有效面积保持在较高的范围内的结论,计算结果表明,当光纤纤芯半径5μm,沟槽相对位置小于0.5时,光纤的色散可约为-2 ps/(km.nm),纤芯的模场面积约为145μm2。3.研究了多芯光纤的芯间串扰特性,得出了沟槽折射率差相对于沟槽相对位置和沟槽相对宽度明显有更好的对串扰特性调节的作用的结论。分析结果表明,当光纤沟槽相对折射率差为0.0025,包层厚度为3μm,沟槽相对宽度大于1.2时,光纤的芯间串扰能达到-50dB。
[Abstract]:With the development of information technology, the communication capacity is increasing day by day. Due to the advantages of large bandwidth, high speed, low loss and so on, optical fiber communication has become the most important part of the future communication development. Increasing the effective mode field area of optical fiber, reducing the dispersion of optical fiber and expanding the transmission capacity of optical fiber are the necessary conditions to realize high power and large capacity transmission. In order to enhance the capacity of optical fiber communication, SDM (Space Division Multiplexing) technology is widely used in the use of multi-core fiber. The transmission of light through multiple cores of a single optical fiber greatly improves the communication capacity of the optical fiber and promotes the development of the optical fiber communication industry. As the basic device of the optical fiber SDM system, the multi-core optical fiber is used as the basic device of the optical fiber SDM system. The merits and demerits are related to the performance of the whole optical fiber communication system. Therefore, the multi-core fiber is studied in detail in this paper, the main work is as follows: 1.Using the coupling mode theory, the coupling equation of the 7-core fiber is deduced. The coupling coefficient formula of the seven core fiber is obtained. In addition, the power coupling theory of the fiber during long distance transmission is analyzed. According to the power coupling theory, the incident of the core from different positions is studied. The dispersion and effective mode field area of multi-core fiber are studied. The relative width of grooves and the relative refractive index difference of grooves are analyzed. The influence of grooves relative position on the dispersion and effective mode field area of fiber is obtained. The conclusion is drawn that the effective area can be kept in a higher range by three parameters in a certain range. The calculation results show that, When the core radius of the fiber is 5 渭 m and the relative position of the groove is less than 0.5, the dispersion of the fiber can be about -2 ps.km.nmnm.The mode field area of the core is about 145 渭 m2.3.The cross-core crosstalk characteristics of the multi-core fiber are studied. It is concluded that the refractive index difference of the grooves has a better effect on the crosstalk characteristics than the relative position and width of the grooves. The analysis results show that the refractive index difference of the grooves is better than the relative position and width of the grooves. When the relative refractive index difference of the fiber grooves is 0.0025, the cladding thickness is 3 渭 m and the relative width of the grooves is larger than 1.2, the intercore crosstalk energy of the fiber can reach -50 dB.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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