共查询到20条相似文献,搜索用时 46 毫秒
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本文分析了SLALOM全光再生的传输特性,计算了SLALOM对国性噪声的抑制能力,指出选择适当载流子寿命的SLA和连续波注入功率可以提高再生器抑制加性噪声的能力,并给出了计算实例。 相似文献
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双环结构级联型全光缓存器 总被引:1,自引:0,他引:1
提出了一种基于平行排列3×3耦合器的双环结构全光缓存器(DLOB)的级联方案,分析了单级和级联结构的缓存原理及读写方式,通过分析半导体光放大器(SOA)的噪声性能,得到光缓存器输出性能丰要由读写操作阶段注入的控制光功率及SOA的工作电流决定的结论,提出了在反馈式光缓存器中实现单级多圈和多级缓存的可能性,并搭建了一个两级的缓存系统,实验验证两级级联各缓存9圈时,输出信号光的功率几乎没有减少,信噪比(SNR)下降不到4 dB.理论分析和实验都表明,级联型光缓存器能够实现从纳秒级到毫秒级的缓存.可以满足未来光包交换(OPS)发展的需要. 相似文献
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提出了基于信号调制格式的转变来实现归零-差分相移键控信号(RZ-DPSK)全光再生的方案。首先通过偏振延时干涉仪将RZ-DPSK信号的相位噪声转变为幅度噪声,然后利用半导体光放大器(SOA)的非线性自增益调制效应对脉冲信号进行整形,最后利用起偏器实现信号相位再生。数值模拟比较了再生前后的信号,取得了良好的再生效果。 相似文献
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工作在三波长状态下的SLA作为非线性元件,在光环形镜中实现OTDM信号的解复用,模拟计算表明,在保持光束功率为1W时,SLA恢复时间小于10ps,可从OTDM复用信号中提取出任一路信号,在控制脉冲功率为900mW时,带宽可达100GHz。 相似文献
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介绍了几种全光半减器的实现方案,分析了各方案的结构和工作原理,以及各自的优缺点,并展望了半减器的发展方向。 相似文献
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A 10 Gbit/s optical data stream has been regenerated all-optically by clock recovery and remodulation. The regenerator consists of a fibre ring laser, modelocked by the incoming data stream, and a Kerr shutter acting as an all-optical AND gate to recode the ring laser pulses with the incoming data. Error ratio measurements for an all-optical regenerator are presented for the first time and the future potential of all-optical regeneration is discussed 相似文献
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Minghua Chen Shuangmei Xu Xianglin Yang 《Journal of Infrared, Millimeter and Terahertz Waves》1997,18(4):847-857
In this paper, transmission properties of the regenerator employing a semiconductor laser amplifier loop mirror (SLALOM) are discussed. The ability of the regenerator to suppress the additive noise in the input data train is calculated. It’s shown that the regenerator can greatly suppress noise in communication system and improve their communication capacity by choosing suitable semiconductor laser amplifier(SLA) and the power of injected continuous wave. 相似文献
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Penalty-free data-pulse regeneration at 84 Gb/s was achieved down to an error rate level of 1×10-11 by using a data pattern length of 231-1. A symmetric-Mach-Zehnder-type all-optical polarization-insensitive semiconductor regenerator was used 相似文献
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M.R.G. Leiria A.V.T. Cartaxo 《Photonics Technology Letters, IEEE》2006,18(16):1711-1713
The dependence of the bit-error ratio (BER) along a 2R all-optical regenerator chain on the nonlinearity threshold and degree is investigated numerically using the rigorous distribution and the Gaussian distribution for the optical power. It is shown that, for high nonlinearity degree, the optimum nonlinearity threshold has a weak dependence on the number of regenerators and, for low nonlinearity degree, increases with the number of regenerators. Numerical results show that the Gaussian distribution may under-estimate or over-estimate the BER and fails to indicate the optimum regenerator parameters. 相似文献
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The optical 3R regenerator using electroabsorption modulators was evaluated at 10 Gbit/s in terms of the all-optical network application. Its reset of impairments induced by the fiber transmission was confirmed by carrying out the multiple recirculating loop experiment. The experimental result shows that the transmission distance could be extended by almost 1.5 times compared to the case when it was not used, inserting the optical regenerator between the two recirculating loops 相似文献
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The author examines some of the ways that speech signals, subjected to certain degradations (e.g. additive noise, interfering speakers, bandlimiting, single-channel data), can be processed to increase the likelihood of being correctly understood. He concentrates on applications that involve monaural listening. He treats spectral and time-domain subtraction techniques, methods involving fundamental frequency tracking, and enhancement by resynthesis 相似文献
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光纤模态噪声限制了下一代高精度视向速度光谱仪的测量精度。特别是当使用相干光源进行波长定标时,模态噪声会引起视向速度测量误差,降低视向速度测量精度。为了抑制光纤模态噪声,提出了一种基于变形镜的动态改变散斑花样的技术方法,该方法是在单次曝光时间内通过动态改变变形镜的面型,平滑光纤引起的散斑花样,提高定标光谱的质心稳定性,从而保证视向速度的测量精度。通过实验,利用632.8 nm 氦氖激光器作为定标光源,验证了该方法的有效性。实验结果表明,单次曝光图像包含约105个变形镜形变模式时,可以有效抑制光纤模态噪声。针对分辨率R=100000的光谱仪,单根定标谱线的情况下,光纤模态噪声引起的视向速度定标误差约为19.8 cm/s,与国际上其他技术方法的精度持平,该方法不仅可以提高能量利用率,且不影响光纤的使用寿命。 相似文献
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Tsiokos D. Bakopoulos P. Poustie A. Maxwell G. Avramopoulos H. 《Electronics letters》2006,42(14):817-819
Root-mean-square-phase jitter reduction from 4 to 1 ps in an all-optical 3R regenerator module operating for continuous and different length data packets at 40 Gbit/s is presented. The circuit is based on hybrid integrated Mach-Zehnder interferometric switches. Error-free operation is demonstrated with 2.5 dB power penalty improvement. 相似文献
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Eiselt M. Pieper W. Grosskopf G. Ludwig R. Weber H.G. 《Photonics Technology Letters, IEEE》1993,5(4):422-424
The distinctly nonlinear input-output characteristics of a nonlinear element consisting of a semiconductor laser amplifier (SLA) in a loop mirror configuration (SLALOM) that may be utilized for pulse shaping and noise reduction is described. As an example, it is shown that nearly unlimited circulations of optical pulses in a fiber ring are possible 相似文献