共查询到18条相似文献,搜索用时 312 毫秒
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用庞加莱球法测量二阶偏振模色散 总被引:5,自引:2,他引:3
用庞加莱球法测量单模光纤中的二阶偏振模色散,并对二阶偏振模色散的各个分量的统计特性及其影响进行了分析。对75km的G.652普通单模光纤的二阶偏振模色散进行了测量,并对二阶偏振模色散的平行分量、垂直分量、偏振相关色散和消偏振项进行了详细的分析.得到了二阶偏振模色散随波长的分布情况、统计特性以及偏振主态随波长的变化情况。从统计结果可以得到.与偏振相关色散项相比,消偏振项在二阶偏振模色散中起主要作用。该研究对二阶偏振模色散的补偿有一定的指导意义。 相似文献
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偏振模色散影响色散控制孤子传输的理论研究 总被引:1,自引:0,他引:1
采用变分法分析高速色散控制孤子在双折射光纤中的传输规律。首先建立了色散控制孤子在双折射光纤中的扰动传输模型 ,然后解析了偏振模色散影响下色散控制孤子各参量的传输演化规律 ,最后对解析结果进行了计算。研究结果表明 ,偏振模色散参量对色散控制孤子能量、脉宽的演化影响很大 ,当偏振模色散很大时 ,如Dp>0 .3ps/km1/ 2 时 ,必须考虑采用某些在线控制手段来有效抑制偏振模色散对传输系统的影响 ,然而 ,当Dp≤ 0 .1ps/km1/ 2 时 ,系统几乎不受影响 ,同时本文还证明了色散控制孤子抗偏振模色散扰动的能力强的这一特点。为研究偏振模色散对高速非线性传输系统、特别是色散控制孤子传输系统的影响提供了理论依据和研究方法。 相似文献
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研究了无损光纤的密勒矩阵,进而得出了偏振模色散矢量的解析表达式、主偏振态对应的斯托克斯矢量的解析表达式,以及高阶偏振模色散矢量的解析表达式.这些解析表达式是由光纤参数决定的.讨论了局部偏振模色散矢量与整体偏振模色散矢量的关系,讨论了利用偏振模色散矢量进行偏振模色散补偿的原理.引入了偏振模色散补偿元件的偏振模色散补偿矢量C,具体计算了正规的非圆光波导类的补偿元件的C.从理论上证明了仅仅利用一个正规的非圆光波导类的补偿元件,例如一根保偏光纤或是一个双折射晶体,是不能实现偏振模色散补偿
关键词:
偏振模色散
密勒矩阵
色散补偿
主偏振态斯托克斯矢量 相似文献
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光纤偏振模色散的测量 总被引:11,自引:1,他引:10
光纤中的偏振模色散是限制高速光纤通信系统传输容量的极限因素,本文报道光纤偏振模色散的测量,对国内外多种光纤进行了测量比较,较长的单模非偏振保持光纤的多次测量值科克斯韦概率分布,同时发现国产的光纤质量有待改进,最后分析了一些实验中观察以的现象并作了解释和讨论。 相似文献
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单模光纤折射率分布对偏振模色散的影响 总被引:4,自引:4,他引:0
利用将任意非圆柱等效为椭圆的方法分析和计算了单模光纤中包层和芯层折射率分布不同心导致的偏振模色散,得到了两个偏振模式的传输常数差△β和偏振模色散△τ与偏心比、入射光的波长、芯层半径、相对折射率差的关系曲线,为实践中昼减小单模光纤的偏振模色散提供理论上的指导。与椭圆度引起的偏振模色散相比,不同心引起的偏振模色散具有相同的数量级。 相似文献
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单模光纤中的二阶偏振模色散及其统计特性 总被引:5,自引:4,他引:1
用琼斯矩阵本征分析法和邦加球法,分别测量了22 km和75 km G.652单模光纤中的二阶偏振模色散,并对其平行分量、垂直分量、PCD(Polarization dependent chromatic dispersion)、消偏振项、各个分量的统计特性及其影响进行了详细的分析,得到了二阶偏振模色散随波长的分布情况及统计特性. 从统计结果可以得到,与PCD项相比,消偏振项在二阶偏振模色散中起主要作用. 该研究对二阶偏振模色散的补偿有一定的指导意义. 相似文献
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In this paper, we employ several general models (introduced in Part I) for the evolution of optical fiber birefringence with
longitudinal distance to analyze, both theoretically and numerically, the behavior of the polarization mode dispersion (PMD)
in single mode fibers. We find that while the probability distribution function of the differential group delay varies along
the fiber length as in existing models, the dependence of the root mean square differential group delay (DGD) on fiber length
differs noticeably from earlier predictions. 相似文献
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Although fiber spinning is known to reduce polarization mode dispersion (PMD) effects in optical fibers, relatively few studies
have been performed of the dependence of the reduction factor on the strength of random birefringence fluctuations. In this
paper, we apply a general mathematical model of random fiber birefringence to sinusoidally spun fibers. We find that while
even in the presence of random birefringence perturbations the maximum reduction of PMD is still obtained when the phase matching
condition is satisfied, the degree of PMD reduction and the probability distribution function of the DGD both vary with the
random birefringence profiles. 相似文献
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Polarization mode dispersion in WDM systems 总被引:5,自引:0,他引:5
The coupled nonlinear Schrodinger equations for two wavelength optical pulses in a birefringence fiber are given. The model for treating polarization mode dispersion in two channel (WDM) system is established. Based on this model, optical signal propagation behaviors in two channel WDM with polarization mode dispersion are numerically simulated. The influences of polarization mode dispersion on two channel WDM system are also analyzed. 相似文献
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偏振模色散及非线性效应对40 Gbit/s密集波分复用系统的影响 总被引:8,自引:0,他引:8
高速率、大容量的密集波分复用系统是光纤通信系统的最终发展方向 ,单信道速率达到 4 0Gbit/s时 ,光纤的非线性效应、偏振模色散现象对系统的影响更加突出。在综合考虑群速度色散、自相位调制、交叉相位调制、四波混合、偏振模色散等因素的基础上 ,推导了密集波分复用系统中任意信道的耦合非线性薛定谔方程组。利用扩展的分步傅里叶方法对该方程进行了数值计算 ,通过对 8× 4 0Gbit/s密集波分复用系统的仿真 ,分别研究了非线性效应和偏振模色散对密集波分复用系统的影响。发现由于交叉相位调制和四波混合作用 ,多波长的密集波分复用系统比单波系统受非线性效应影响严重 ;系统受偏振模色散与非线性效应的影响程度与输入信号功率有关 ,在入射光单信道平均功率较低 0 .1mW时 ,偏振模色散是影响系统性能的主要因素 ;当入射光单信道平均功率较高1mW时 ,系统受非线性效应影响严重。而偏振模色散在使信号脉冲展宽的同时 ,类似于非零色散位移光纤中的微小色散 ,对非线性效应又有一定的抑制作用。 相似文献
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P. Muthu Chidambara Nathan N. Kalyanasundaram D. Ravikumar 《Fiber and Integrated Optics》2008,27(2):99-111
In this article, the propagation of solitons in a single mode fiber with polarization mode dispersion (PMD) is analyzed. In optical fibers, the randomly varying birefringence degrades soliton transmission system in two aspects. First, the dispersive waves cause pulse broadening. Second, the dispersive waves interact with other soliton pulses. Here we studied the effects of PMD on a single pulse and the variation of pulse broadening, energy decay, and degree of polarization on a single soliton pulse propagating over a very long distance. 相似文献
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R. Caponi E. Ciaramella E. Riccardi M. Schiano T. Tambosso G. Zaffiro 《Fiber and Integrated Optics》2013,32(4):295-309
Polarization mode dispersion of chirped Bragg gratings is analyzed in terms of key birefringence phenomena and impact on telecommunication systems performance. The influence on polarization mode dispersion (PMD) of fiber birefringence, grating chromatic dispersion, and ripples of the group delay curve is pointed out. Polarization mode dispersion influence on systems performance is investigated by numerical simulations and transmission experiments at 10 Gbit/s. The deterministic nature of Bragg gratings PMD determines a moderate, upper-limited system penalty for a transmission line employing a single compensating device. However, in the case of broadband components, a non-negligible PMD penalty may be observed due to the difficulty of controlling accurately the group delay linearity. 相似文献
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In this paper, polarization properties and propagation characteristics of rectangular lattice photonic crystal fibers with elliptical air-holes are investigated by using the full-vector finite element method with anisotropic perfectly matched layers. Numerical results show that the birefringence of the fiber is induced by asymmetries of the cladding. Moreover, by adjusting its structure parameters, such as the hole pitch Λ, and the air-hole elliptical rate η, we find the optimized design parameters of the fiber with high birefringence (the order of 10−2) and limited polarization mode dispersion, operating in a single mode region at an appropriate wavelength range. 相似文献