共查询到18条相似文献,搜索用时 109 毫秒
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人们熟知,由非线性薛定谔(NLS)方程描述的光学孤子可以在单模光纤中稳定地传输。本文在准单色近似和慢变包络近似条件下,利拥泰勒级数展开推出了这一非线性传输方程。由于推出的方程包含着高阶线性色散和光纤损耗项,因而可以用来研究短光脉冲(皮秒量级)在单模光纤传输过程中相关的非线性光学孤子效应,比如光学孤子分裂和光学孤子损耗等。 相似文献
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普通单模光纤中光孤子传输问题的研究 总被引:1,自引:0,他引:1
在使用普通单模光纤的光孤子传输系统中,放大器自发辐射(ASE)噪声和色散波逸出是限制光孤子传输的两个主要因素,它们将引起孤子能量科动和定时抖动,从而导致系统误码。本文分别研究了带限光滤波器对ASE噪声的抑制和非线性增益对色散波的抑制以及对孤子传输系统的稳定作用,并设计了使用普通单模光纤的光孤子传输系统。 相似文献
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光子晶体的反常色散特性为色散补偿、短波长光孤子传输和超短脉冲压缩提供了可能,而普通单模光纤的零色散点总向长波方向移动,为此,文章研究了通过合理的设计光子晶体光纤来使TIR-PCF零色散点向短波推进,以在几百nm范围内取得零色散的方法。 相似文献
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对不同波长的光脉冲在由正负色散光纤的组成的光纤链中的传输特性进行了数值和实验研究。实验结果和数值分析表明,在相同的初始条件下,短距离传输时,采用平均色散为正常色散的光纤传输要优于孤子传输方式,长距离传输时,采用孤子传输要优于脉冲在平均色散为正常色散的非线性光纤中传输。在正负色散位移的光纤链中的孤子传输,有一最佳波长。 相似文献
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利用光子晶体光纤实现10 Gb/s光传输系统的色散补偿 总被引:8,自引:2,他引:6
利用光子晶体光纤(PCF)在10Gb/s光传输系统中对普通单模光纤中传输的光脉冲进行了色散补偿,获得了很好的补偿效果。实验中,10Gb/s光脉冲序列经过2.163km普通单模光纤被展宽后.利用26m长光子晶体光纤对其进行色散补偿.补偿后脉冲基本恢复到了初始形状。进一步的理论计算表明,此光纤在C波段20nm波长范围内对普通单模光纤能够实现较好的色散斜率补偿,补偿后剩余色散小于5ps/nm。理论与实验结果表明光子晶体光纤在色散补偿方面具有很大的潜力.在未来光通信系统中将发挥重要作用。 相似文献
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光孤子在分布式光纤放大器中传输特性的研究 总被引:1,自引:1,他引:0
光纤放大器用于补偿光信号在光纤中的传输损耗,是全光通信网中的核心器件。建立了光孤子在分布式光纤放大器中传输的物理模型,采用分步傅里叶变换法数值模拟了光孤子的传输放大特性,讨论了增益色散对光孤子形状和频谱的影响。结果表明:在放大器的反常色散区,随着光孤子的放大,会不断地产生啁啾孤子,孤子频谱会加宽并且产生振荡结构。放大介质的增益色散将会使光孤子幅度下降,宽度展宽,频谱窄化。因此,光纤放大器的色散、非线性效应和增益色散均会对光孤子的传输特性产生影响。 相似文献
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平均色散值为正和负的色散管理系统中光孤子传输特性数值模拟 总被引:2,自引:2,他引:0
为了讨论光孤子在色散管理系统中传输的特性,分别模拟了孤子在平均色散为负(反常色散)、正(正常色散)的不同色散深度色散管理系统中演化的情况,结果表明,随着周期色散图色散深度的增大,稳定传输的脉冲峰值功率增大,且脉冲周期性振幅的波动幅度增大,并且发现了亮孤子可以在平均色散为正的光纤系统中传输,但传输质量较差,传输距离有限。 相似文献
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Numerical simulations show that the impact of the pulse shape on the power penalty in intensity modulated systems with standard, nonlinear fibers is decisive. This can be used to define a three-level modulation scheme that makes use of the interaction between fiber dispersion and fiber nonlinearities. By adjusting the pulse shape and peak power in a three-level modulation scheme, the standard dispersion limit of 65 km at 10 Gb/s can be extended to 170 km. The control of the pulse shape can be accomplished in the electrical domain, and therefore the effects of fiber dispersion can be compensated electrically. This is very advantageous compared with dispersion compensation schemes in the optical domain 相似文献
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Bi-end dispersion compensation (DC) for ultralong nonreturn-to-zero (NRZ) optical transmission system is studied. Both the loss and dispersion of the transmission fiber are periodically compensated. Two dispersive elements are placed at the input and output ends of a compensation period, respectively, to compensate for fiber dispersion. The pulse compression owing to self-phase modulation (SPM) can be adjusted by the compensation ratios of the dispersive elements at the two ends of a compensation period. Therefore, the pulse compression can be optimized and the system performance can be improved to compare with the system with either pre- or postdispersion compensation. The rules to design the system are considered. The transmission system of 10-Gb/s bit rate, 9000-km transmission distance, and 100-km compensation period is taken as an example. The second-order fiber dispersion is assumed to be completely compensated. Wave equation is numerically solved to study the system performance which is represented by Q factor. The relations of several system parameters and Q factor are studied. The system parameters include the compensation ratios of the dispersive elements at the two ends of a compensation period, dispersion of transmission fiber, signal power, and the compensation ratios of third-order fiber dispersion. If the third-order fiber dispersion cannot be completely compensated, it is found that one can use a higher signal power to improve the system performance 相似文献
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In anormalous dispersion of monomode optical fiber,optical solitons are evolvedfrom optical pulses when the dispersion is balanced by the nonlinearity.Undistorted transmissioncan be realized by using optical solitons,which can offer much greater the transmission capacityand extend the repeater spacing of the fiber communication system.The mechanism of thegeneration of optical solitons is expounded.A few forms of nonlinear transmission equationare obtained by using a concise method.The general complete expression of elementary solitonsolution of the nonlinear transmission equation without loss is given,and the design of the solitontransmission system is discussed. 相似文献
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在单模光纤异常色散区,当非线性与色散平衡时,初始注入的光脉冲演化形成光孤立子。利用光孤立子可实现无畸变传输,大大提高光纤通信系统的容量和中继距离。本文简述了光孤立子产生的机理,用一种简明通用的方法求得了多种形式的光纤非线性传输方程,给出了无损耗非线性传输方程基态孤立子解完整的一般表示式,同时对孤立子系统设计进行了讨论。 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1981,69(9):1145-1150
A transmission rate of ≃1 Tbits/sec (≃0.1 Tbits/s) per 30 km can be achieved using envelope solitons with peak power of ≃10 W (≃10 mW) in a monomode optical fiber, respectively. Unlike the linear pulse in which the bit rate is limited by the group dispersion, the bit rate of soliton transmission is limited by the fiber loss and the input power. Conditions for achieving optimum transmission rate using solitons are theoretically obtained including the effects of fiber loss and second order group dispersion. 相似文献