共查询到20条相似文献,搜索用时 609 毫秒
1.
根据光传输系统中受激布里渊散射(SBS)效应产生的基本原理分析了色散对SBS效应的抑制作用,定性分析了不同色散补偿方法对SBS效应的抑制效果,得出了前置色散补偿可以很好地抑制光纤中SBS效应的结论,并用实际的光传输系统进行了实验验证,在入纤功率小于6dBm、信号速率为10Gbps、传输光纤为G.652的光传输系统、前置色散补偿为-800ps/nm情况下,可以提高系统的SBS效应阈值2dB左右。 相似文献
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Optical 10-Gbit / s return-to-zero pulse transmission in cascaded communication systems using dispersion compensation of the standard monomode fiber with large amplifier spacing is examined. It is shown that pulse distortions that are due to Kerr nonlinearity are significantly diminished by symmetrical ordering of the compensation sections when the total number of precompensation and postcompensation sections is equal. Repositioning of these sections is not critical. 相似文献
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由于同轴电缆的低通传输特性,脉冲信号在同轴电缆中传输时不可避免地会出现畸变,并且畸变程度会随着脉冲信号频率、带宽以及传输距离的增加而增大。创新性地将图像处理领域中的一种图像复原方法——维纳滤波法应用于脉冲信号同轴电缆传输畸变补偿,仅利用同轴电缆的S参数和输出信号即可完成输入信号的重构。并以10 m同轴电缆为对象,采用该方法分别对双指数脉冲信号、高斯调制脉冲信号、调制方波信号进行传输畸变补偿。结果表明:对于不同样式的信号,该方法均具有优异的补偿性能;并且,与工程上常用的衰减补偿法相比,该方法不仅补偿精度高,还具有高的计算效率,在同轴电缆脉冲信号传输畸变补偿中具有很好的实用价值。 相似文献
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Magnus Karlsson Henrik Sunnerud 《Journal of Optical and Fiber Communications Reports》2004,1(2):123-140
We discuss the influence of polarization mode dispersion (PMD) on
optical communication channels by putting special emphasis on
PMD-induced pulse broadening. We present the analytical theory for
PMD-induced pulse broadening, first in the deterministic and then for
the random case. We then apply this theory to a comparison between a
few different simple PMD-compensators. We also discuss the systems
implications and outage probabilities that arise for different
compensating techniques, including active optical compensation,
alternative modulation formats and error correcting codes. Then we
consider wavelength division multiplexing (WDM) systems, and present
the unique aspects of PMD and PMD compensation that distinguish WDM
transmission from the single-channel case. Finally the temporal drift
is discussed, and the associated autocorrelation function is
presented. 相似文献
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We theoretically investigate the phase noise in quasi-linear optical transmission systems and study the mitigation of phase noise by properly choosing periodic dispersion compensation and amplification. Variational method is used to deduce the analytical formula for calculating the phase fluctuations of a Gaussian pulse. The analytical predictions are then checked against direct simulations by numerically solving the nonlinear Schrödinger equation. We find that stronger dispersion compensation maps can be used to reduce phase noise and it can be further mitigated by modifying the dispersion map appropriately. It is also found that shorter amplifier spacing yields lower phase noise. We also explore the effect of pre-, post- and bi-end dispersion compensation configurations on phase noise with full compensation and check the reduction of phase noise along the fiber link. 相似文献
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Yong Lee 《Optical Review》1998,5(4):226-233
A compact transmissive waveguide-type dispersion compensation device that uses waveguide grating routers is proposed. This device provides dispersion compensation in long-haul fiber transmission lines and can also be used as a pulse compressor for ultrashort optical pulse generation. A device for the pulse compression of picosecond-length optical pulses has been designed and is numerically analyzed. The proposed device works as a compact (on the centimeter order) and transmissive pulse compressor for picosecond optical pulses. 相似文献
8.
Candong Liu Yinghui Zheng Zhinan Zeng Peng Liu Ruxin Li Zhizhan Xu 《Laser Physics》2009,19(8):1600-1606
We propose a scheme to generate broadband high harmonic supercontinuum and single attosecond pulse emission in time domain by employing a chirped polarization-gating laser field. It is shown that this scheme can significantly extend the high harmonic cutoff to higher energy region, and the produced isolated attosecond pulse is shorter than 100 attoseconds after proper dispersion compensation, when a 7 fs driving laser pulse is used. 相似文献
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We demonstrate a pulse compression technique through filamentation in an argon-filled cell. By using a pair of chirped mirrors for dispersion compensation, we have successfully compressed the 53 fs pulse to 15 fs with good spatial qualities and good pulse stability. The total transmitted efficiency is more than 75%. The influence of the experiment parameters to the compressed pulses is also studied experhnentally. 相似文献
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The basic mechanism of cross-phase modulation induced phase fluctuations in optical RZ pulse propagating in a periodically dispersion compensated transmission line has been investigated. Ordinary differential equations have been derived using variational analysis to estimate the phase fluctuation and the analytical result is verified by numerical simulations based on split-step Fourier method. We therefore explore the impact of different dispersion compensation maps on phase fluctuation for 10 Gb/s and 40 Gb/s WDM transmission systems. The effects of initial pulse spacing between channels, channel spacing and residual dispersion on phase shift have been studied. We find that cross-phase modulation induced phase fluctuation can be mitigated by proper adjustment of channel spacing and/or residual dispersion. 相似文献
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初始啁啾补偿光纤色散效应的适用范围 总被引:6,自引:5,他引:1
以啁啾高斯脉冲在单模光纤中的传输为例,分别就线性初始啁啾对光纤二阶和三阶色散的补偿进行了系统的理论分析和数值计算,结果表明:线性初始啁啾对光纤的二阶色散(线性色散)有一定的补偿作用,但不能有效地用于三阶色散的补偿. 相似文献
13.
We study nonlinear pulse propagation in an optical transmission system with dispersion compensation. A chirped nonlinear pulse can propagate in such a system, but eventually it decays into dispersive waves in a way similar to the tunneling effect in quantum mechanics. The pulse consists of a quadratic potential that is due to chirp in addition to the usual self-trapping potential and is responsible for the power enhancement and the decay. 相似文献
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By replacing the dispersive element in a zero-dispersion pulse shaper with a grism, we have constructed a quartic-phase-limited pulse shaper. We demonstrate compensation of 4500 fs2 without the use of a dynamic element in the pulse shaping line, which is approximately the amount of dispersion induced by a typical multiphoton microscope. We also demonstrate that detuning the pulse shaper to compensate for quadratic phase induces negligible spatial chirp, thereby maintaining a high-quality focal spot for a microscopy setup. 相似文献
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A novel scheme for postnonlinearity compensation is proposed to reduce the phase jitter in phase-shift keying transmission. A phase modulator is used to modulate the phase of the data pulses in front of the receiver. The magnitude of the phase modulation is proportional to the detected pulse intensity, and the sign is opposite to that of the nonlinear phase shift caused by self-phase modulation. Thus, the nonlinear phase noise induced by amplitude fluctuation and self-phase modulation is partially compensated for. We show by numerical simulations that a differential phase-shift keying dispersion-managed soliton system at 10Gbits/s with such postnonlinearity compensation can provide greater than 3dB of improvement in ultralong-haul dense wavelength-division multiplexing transmissions. 相似文献
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Reduced-power optical solitons in fiber lines with short-scale dispersion management 总被引:9,自引:0,他引:9
We examine the properties of dispersion-managed (DM) solitons in fiber lines with dispersion-compensation period L much shorter than amplification distance Z(a) . DM solitons in systems with short-scale dispersion compensation have reduced power compared with DM solitons in previously studied regimes with L>/=Z(a) power (for the same local and average dispersion and the same pulse width). As a result, chirped DM soliton transmission with reasonably low power can be realized with shorter pulses when DM solitons in systems with large L/Z(a) ratios have energies that are too high to be used in practice. 相似文献
18.
M. F. Ferreira A. N. Pinto P. S. Andr N. J. Muga J. E. MacHado R. N. Nogueira S. V. Latas M. H. Sousa J. F. Rocha 《Fiber and Integrated Optics》2005,24(3):261-285
We review the research progress concerning some fundamental issues related to polarization-mode dispersion (PMD) in high-speed fiber-optic transmission systems. We pay particular attention to issues such as the PMD-induced pulse broadening, PMD measurement and emulation, as well as PMD compensation. An electrical equalization technique based on a transversal filter and an optical technique based on a nonlinear chirped fiber Bragg gratings for PMD compensation will be discussed. 相似文献
19.
Mínguez-Vega G Lancis J Caraquitena J Torres-Company V Andrés P 《Optics letters》2006,31(17):2631-2633
We report spatial and temporal dispersion compensation for fan-out of femtosecond pulses with a low-frequency diffraction grating by means of a hybrid diffractive-refractive lens triplet. In this way, we achieve a multifocal light structure with nearly diffraction-limited light spots even for 20 fs pulse duration. The spatial chromatic compensation, which drastically reduces the lateral walk-off of the various spectral components, also allows us to improve the available bandwidth at the dispersion-compensated diffraction orders. In fact, the temporal width of the output pulse is essentially limited by the group-delay dispersion term, which is shown to be small. The high spatiotemporal resolution provided by our proposal permits parallel multifocal processing of materials with femtosecond pulses. 相似文献
20.
J D'hooge B Bijnens J Nuyts J M Gorce D Friboulet J Thoen F Van de Werf P Suetens 《The Journal of the Acoustical Society of America》1999,106(2):1126-1133
A study is presented in which the influence of the pressure amplitude of the incident pulse on the estimated frequency dependency of the attenuation coefficient is shown. First, the effect is demonstrated with a simple theoretical model for both transmission and reflection measurements. Simulations show that for both measurement techniques a high-amplitude incident pulse results in a biased estimate of the attenuation coefficient due to nonlinear interaction of the different frequency components of the incident pulse. It is shown that in transmission and reflection measurements the biases have opposite signs. The effect of bandwidth, central frequency, and phase of the incident pulse on this bias is investigated. Second, the effect is demonstrated both in vitro, using a broadband through-transmission substitution technique on a tissue mimicking gelatine phantom, and in vivo, using reflection measurements with standard clinical equipment. The experimental results agree well with the theoretical model. The relevance of this study for ultrasonic tissue characterization is shown. 相似文献