共查询到17条相似文献,搜索用时 109 毫秒
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偏振模色散(PMD)是对高速长距离光纤传输系统影响较大的一个因素,文章论述了PMD对光纤通信系统的影响,建立了光纤通信系统中PMD影响的理论模型,在分析单通道一阶补偿方法的局限性的同时,对高阶PMD及其补偿问题进行了分析与讨论,提出了二阶PMD补偿方案,并对该方案进行了研究. 相似文献
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针对光纤传输中的偏振模色散(PMD)问题,研究和比较了现有PMD的光域补偿方法.利用等效啁啾技术,提出了一种基于啁啾光纤光栅的光域补偿方案,用具有光敏性质的保偏光纤制成啁啾光纤光栅,将其作为PMD补偿器中的时延线,实现了PMD的自适应反馈补偿.实验结果显示,该方案能有效补偿光纤传输中的PMD问题,提高光信号的传输质量. 相似文献
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高速光通信中的PMD补偿技术 总被引:1,自引:0,他引:1
偏振模色散(PMD)已成为发展下一代高速长距离光纤通信的主要限制因素,介绍了PMD补偿的基本理论,并分析讨论了一阶、二阶和高阶PMD补偿方法。 相似文献
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LUORui LITang-jun WANGMu-guang JIANShui-sheng XUJing-jing 《半导体光子学与技术》2004,10(3):149-151
By introducing a two-stage polarization mode dispersion (PMD) compensator after a optical fiber link with a large PMD,over 270 ps first-order and 2 000 ps2 high-order PMD was compensated. The results show that the two-stage compensator can be used to PMD compensation in the 20 Gb/s optical time division multiplexing system with 60 km high PMD fiber. After compensating, the 270 ps DGD is changed into max. 7 ps. Moreover,the tunable FBG has a function of dispersion compensation. 相似文献
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ZHU Jin-jun ZHANG Xiao-guang DUAN Gao-yan WANG Qiu-guo 《半导体光子学与技术》2006,12(4):217-223,256
Polarization mode dispersion(PMD) is considered to be the ultimate limitation in high-speed optical fiber communication systems. Establishing an effective control algorithm for adaptive PMD compensation is a challenging task, because PMD possesses the time-varying and statistical properties. The particle swarm optimization(PSO) algorithm is introduced into self-adaptive PMD compensation as feedback control algorithm. The experiment results show that PSO-based control algorithm has some unique features of rapid convergence to the global optimum without being trapped in local sub-optima and good robustness to noise in the optical fiber transmission line that has never been achieved in PMD compensation before. 相似文献
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Polarization mode dispersion(PMD) is considered to be the ultimate limitation in high-speed optical fiber communication systems. Establishing an effective control algorithm for adaptive PMD compensation is a challenging task, because PMD possesses the time-varying and statistical properties. The particle swarm optimization(PSO) algorithm is introduced into self-adaptive PMD compensation as feedback control algorithm. The experiment results show that PSO2based control algorithm has some unique features of rapid convergence to the global optimum without being trapped in local sub-optima and good robustness to noise in the optical fiber transmission line that has never been achieved in PMD compensation before. 相似文献
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The basic property of degree of polarization (DOP) degradation of optical signal induced by polarization mode dispersion (PMD) in high-speed optical fiber transmission is investigated in detail. The DOP of the optical signal reflects the degree of waveform degradation caused by PMD, therefore, it is proposed to be used as the control signal judging the best compensation point for the optical adaptive PMD compensation techniques. However, the signal DOP is not only affected by PMD, but also by various factors, such as the modulation format, modulator chirp, fiber nonlinearity, amplified spontaneous emission (ASE), and so on. We use numerical simulations and experiments to explore the basic DOP property to detect PMD with these factors. We also show that using the signal DOP as control signal is especially useful for the optical duo-binary modulation because of its high sensitivity and wide PMD detection range 相似文献
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光纤通信线路的偏振模色散已成为高速、长距离光纤通信系统发展的主要障碍之一 ,其特性、测量以及补偿方法的研究成为目前光纤通信研究热点之一。偏振模色散仿真器 ,用于仿真传输链路的偏振模色散特性 ,不仅可用于偏振模色散补偿器 ,也可用于高速长距离光纤通信系统的规划设计等。本文分析了光纤偏振模色散仿真器的研究现状 ,归纳总结了现有偏振模色散仿真器的设计原理和结构特征 ,并用蒙特卡罗法对常用的偏振模色散仿真器的特性进行了数值模拟 相似文献
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偏振模色散(PMD)已经成为高速光纤通信系统发展的严重障碍。我们将粒子群优化(Particle Swarm Optimization—PSO)算法作为偏振模色散自适应补偿中的反馈控制算法,对光链路中的PMD信号进行收索跟踪,并控制偏振控制器(Polarization Controller—PC),成功的实现了对二阶PMD的自适应补偿。实验结果表明,粒子群优化算法能够避免陷入局部极值而快速的搜索全局最佳值,同时它还具有很强的抗链路噪声的能力,补偿效果良好。 相似文献