拉曼效应对低双折射光纤偏振态的影响与演化分析

发布时间：2018-01-15 12:07

本文关键词：拉曼效应对低双折射光纤偏振态的影响与演化分析　出处：《内蒙古大学》2015年硕士论文　论文类型：学位论文

【摘要】：在准连续情况下,通过求解低双折射光纤中含有拉曼效应的右旋与左旋圆偏振光所满足的耦合非线性薛定谔方程,研究了低输入功率和高输入功率情形在加入拉曼效应前后,有效偏振拍长和输入功率的变化关系,并得到了归一化功率以及相位差的解析解.利用解析解,推导出了椭圆率和方位角的表达式,研究了拉曼效应和传输距离对偏振态演化的影响,并用相平面法对椭圆率和归一化方位角随着归一化输入功率的变化进行了直观描述.结果表明：低双折射光纤在传输的过程中,无论入射光的偏振是沿着慢轴或沿着快轴,拉曼效应均改变了入射光偏振态演变的周期,同时改变了入射光的传输距离；传输距离同样是影响其偏振态稳定性的因素,亦改变了椭圆率和归一化方位角的演变周期以及振荡幅度.本文由三个部分组成：引言、正文、总结,引言中主要介绍了本课题的研究背景以及研究的意义等内容；正文分两个部分进行介绍：主要介绍了拉曼效应对低双折射光纤偏振态的影响和演化分析的理论推导和过程分析,最后进行了总结.得出拉曼效应改变了低双折射光纤偏振态的周期,同时改变了传输距离。传输距离同样是影响其偏振态稳定性的因素,改变了椭圆率和归一化方位角的演变周期以及振荡幅度.
[Abstract]:In quasi-continuous case, the coupled nonlinear Schrodinger equation of right-handed and left-handed circular polarized light with Raman effect in low birefringence fiber is solved by solving the coupled nonlinear Schrodinger equation. The relationship between the effective polarization beat length and the input power in the case of low input power and high input power before and after the addition of Raman effect is studied, and the analytical solutions of normalized power and phase difference are obtained. The expressions of ellipticity and azimuth are derived, and the effects of Raman effect and transmission distance on the evolution of polarization state are studied. The change of ellipticity and normalized azimuth with normalized input power is described intuitively with the phase plane method. The results show that the low birefringence fiber is in the process of transmission. No matter whether the polarization of incident light is along the slow axis or along the fast axis, the Raman effect changes the period of polarization state evolution and the transmission distance of incident light. Transmission distance is the same factor that affects the stability of polarization state. It also changes the evolution period and oscillation amplitude of ellipticity and normalized azimuth. This paper consists of three parts: introduction, text and summary. The introduction mainly introduces the research background and significance of this topic. The main body is divided into two parts: the influence of Raman effect on the polarization state of low birefringence fiber and the theoretical derivation and process analysis of the evolution analysis of the Raman effect on the polarization state of low birefringence fiber are introduced. Finally, it is concluded that Raman effect changes the period of polarization state of low birefringence fiber, and changes the transmission distance. The transmission distance is also the factor that affects the stability of polarization state of low birefringence fiber. The evolution period and oscillation amplitude of ellipticity and normalized azimuth are changed.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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