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本文从光纤色散和啁啾光栅所提供的延时两方面对光通信系统中的色散补偿进行了分析,表明每隔放大器的中继距离插入一啁啾光栅进行色散补偿可实现信号无失真传输,在此基础上提出了在中继器中同时实现全光信号放大和色散补偿的光纤通信系统方案。 相似文献
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脉冲初始啁啾对色散管理孤子传输性能的影响 总被引:6,自引:2,他引:4
本文数值分析了脉冲始啁啾对色散控制孤子传输性的影响,得出的结论为:适当地选择正的初始啁啾可以提高后补偿系统中孤子的传输特性;负啁啾可以提高前补偿系统中孤子的传输性能。初始啁啾参量的大小与色散补偿的结构以及平均输入功率有关,并提出对采用啁啾技术的色散管理孤子系统设计的新方法。 相似文献
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啁啾光纤光栅是用于偏振模色散补偿的重要光无源器件。本文对基于两个啁啾光纤光栅的偏振模色散补偿系统进行了分析。重点分析了啁啾光纤光栅的一阶啁啾系数c1和两个光栅之间的有效折射率差△n变化对系统补偿特性的影响,并进行了数值仿真。 相似文献
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预啁啾技术作为光纤色散的一种补偿技术已经提出了本文针对此技术中瞬太啁啾的作用进行了详尽的分析,得出它将会导致传输能量损失的结论,最后本文提出了通过采用最佳延时消除该影响的方法,并计算了不同参数下的最佳延迟时间。 相似文献
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本文以10Gbit/s在G.652光纤传输1170km的光纤通信系统进行了研究,分别用色散补偿光纤和啁啾光纤光栅进行了色散补偿的计算机模拟实验,根据实验结果设计发符合系统要求的啁啾光纤光栅。 相似文献
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对存在偏振模色散(PMD)和群时延(GD)抖动的非理想线性啁啾光纤光栅的色散补偿特性进行了研究。实验测量了啁啾光纤光栅的群时延谱和偏振模色散光谱,理论分析和实验测量表明,啁啾光纤光栅差分群时延(DGD)抖动与其时延抖动密切相关。通过数值模拟方法,计算了线性啁啾光纤光栅偏振模色散眼图代价与入射到啁啾光纤光栅色散补偿器的光信号的偏振方向的关系,计算结果表明在使用啁啾光纤光栅色散补偿器时应对光信号的偏振方向进行调整,以获得最佳补偿效果。另外结合实验数据,模拟计算并讨论了非理想线性啁啾光纤光栅群时延抖动和偏振模色散引起的信号的展宽和脉冲形状的劣化。 相似文献
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首先介绍了不同种双折射率差Δn的光纤制成的啁啾光纤光栅中偏振模色散现象 ,然后说明了光栅中偏振模色散的大小与 Δ n的相关性 ,并阐述了对用于色散补偿作用的啁啾光纤光栅中偏振模色散的消除 (补偿 )方法 ,最后指出利用啁啾光纤光栅中大的偏振模色散对高速光通信系统传输线路中偏振模色散的补偿方法。 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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The adaptive polarization mode dispersion(PMD) compensation in high-speed transmission system has become more and more necessary for the link PMD causing strong signal distortions.A dynamic adaptive PMD compensator in 40 Gb/s polar-multiplex differential quadrature phase shift keying(PM-DQPSK) system is reported.Experimental results show that the PMD compensator can track the average polarization state variation at 65 rad/s without any lost of the optimum tracking.The 1st-order PMD compensation is demonstrated experimentally,and the compensator can increase the maximal tolerable PMD value by 26 ps from 17 ps to 43 ps in an optical transmission system. 相似文献
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ZHANG Qi CHEN Ming-hua CHEN Hong-wei ZHANG Ji-yu 《光电子快报》2007,3(3):207-210
In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms. 相似文献
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On the second-order approximation of PMD 总被引:4,自引:0,他引:4
A second-order polarization mode dispersion (PMD) approximation based upon the pulse-width distortion has been studied. It shows that a complete second-order approximation should include the second derivative of the PR-ID vector as well as the first derivative of the PMD vector. Second-order pulse distortions are explicitly expressed including a `first-order' term involving principal states of polarization (PSP) of the pulse and a second-order term involving the beating between fiber chromatic dispersion and effective PMD chromatic dispersion. An analytical result is derived for the probability of second-order PR-ID power penalty. It shows that the mean PMD of the fiber should be restricted to 26 ps and 18 ps, respectively for an optical link with zero and 850 ps/nm chromatic dispersion, in order to maintain a one dB second-order PMD power penalty with a probability below 10-6 at a data rate of 10 Gb/s. The analysis also indicates that a second-order PMD compensator can be used as a dynamic chromatic dispersion compensator 相似文献
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Daikoku M. Miyazaki T. Morita I. Hattori T. Tanaka H. Kubota F. Suzuki M. 《Lightwave Technology, Journal of》2009,27(5):451-461
Higher bit-rate transmission is attractive for improving network resource efficiency and reducing the complexity of network management in future transmission systems. However, chromatic dispersion and polarization mode dispersion (PMD) are one of the most serious impairments. In particular, PMD should be compensated for dynamically because it changes rapidly according to environmental variations such as temperature change and mechanical vibration. Therefore, an adaptive PMD compensator is indispensable for higher bit-rate transmission systems. In this paper, we employed a simple and bit-rate independent PMD compensator based on a polarizer with an optical power monitoring scheme in 160 Gb/s-based field experiments. By using the PMD compensator, the single channel transmission of a 160 Gb/s return-to-zero differential phase-shift-keying modulation signal over an installed fiber link with buried and aerial cable routes was successfully achieved. Approximately 1 dB of Q-factor was improved by using the PMD compensator when PMD impairment was maximized. Through these experiments, the effectiveness of the PMD compensator in the higher bit-rate transmission systems was confirmed in the field environment. Furthermore, single-polarization 8times160 Gb/s wavelength division multiplexing transmission over the installed 200 km standard single mode fiber without polarization demultiplexing was successfully achieved by using the simple PMD compensator. 相似文献
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For transmission systems at 10 Gb/s and beyond, polarization-mode dispersion (PMD) is one of the limiting factors. Optical PMD compensators aim at increasing the PMD value tolerated by the system; however, they do not cancel out its effects. Therefore, the performance of a PMD compensator is assessed statistically. Requirements for optical PMD compensators include a response time in the range of 1 ms in order to follow polarization fluctuations over the line. The system design should account for the interaction of other transmission impairments with the PMD compensator operation. For instance, transmitter chirp and residual chromatic dispersion have a deleterious impact on the compensator performance. While self-phase modulation is harmless, cross-phase modulation greatly reduces the compensator efficiency. System design rules have been applied to a one-year field trial, showing the compensator's efficiency and reliability. However, reducing their cost is the next challenge that will bring optical PMD compensators to be used in installed systems. 相似文献
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The authors show that three concatenated first-order polarization mode dispersion (PMD) segments are sufficient to compensate any first- and second-order PMD present in a transmission fiber. They determine analytically the required individual rotation matrix of the polarization rotators and the required differential group delay for the variable delay line in the compensator. 相似文献
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We proposed a degree of polarization (DOP) controlling multi-stage electrical polarization mode dispersion (PMD) compensator in digital coherent receiver. The compensator is modulation format independent and can mitigate both first order and higher order PMD. We evaluated this PMD compensator in both 100-Gb/s 16-QAM and QPSK signal transmission systems with 15 ps and 20 ps average differential group delay (DGD) respectively. The results show that, for both two cases, less than 0.2 dB optical signal to noise ratio (OSNR) penalty at 1e?3 symbol error rate (SER) can be achieved after 4-stage PMD compensation. 相似文献
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Automatic compensation of polarization-mode dispersion for 40 Gb/s transmission systems 总被引:7,自引:0,他引:7
We present an automatic compensator that effectively mitigates signal distortion due to polarization-mode dispersion (PMD). Accurate compensation is achieved by utilizing a degree of polarization (DOP) monitor with a measurement uncertainty of better than 1% achieved by applying a self-dependent precalibration procedure. The compensation performance at 43 Gb/s was evaluated systematically with respect to both first- and second-order PMD by using a crystal-optical PMD emulator. The compensator extended the tolerable differential group-delay (DGD) limit from 8 to 28 ps, while maintaining the Q penalty below 1 dB. In terms of the average of a Maxwellian-distributed DGD, the PMD compensator enabled transmission for up to 8 ps, or about three times higher than the level tolerated in the uncompensated case. In addition to the compensation performance, we demonstrate successful operation, even for distorted signals with high chromatic dispersion. We believe this capability will be a key enabler for a combined operation with adaptive chromatic dispersion compensators. 相似文献