共查询到19条相似文献,搜索用时 109 毫秒
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对40 Gb/s OTDM系统中光纤光栅色散补偿器进行偏振模色散补偿的研究 总被引:3,自引:2,他引:1
改变光纤光栅紫外曝光系统 ,在相位掩模板后插入一个旋转装置 ,使得光纤在制作过程中可以进行某种旋转。通过这种方法制作的光纤光栅偏振模色散减小到平均差分群时延 (DGD)约为 0 2ps,而没加旋转制作的光纤光栅平均DGD约为 18 2 ps。采用两个这种低偏振模色散 (PMD)的光纤布拉格光栅 (FBG) ,成功地在 4 0Gb/s光时分复用 (OTDM)系统中补偿了约 2 0 4 0 ps的色散 ,该系统在经过 12 2km普通单模光纤传输后 ,未发现PMD的影响 ,传输功率代价小于 1 4dB。 相似文献
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为实现高速光纤通信系统中的偏振模色散(PMD)补偿,提出了基于高双折射线性啁啾光纤光栅(Hi-BiLCFBG)的线性应变梯度悬臂梁作为PMD补偿器,同时考虑到波分复用(WDM)系统中不同信道PMD值不同,提出了取样啁啾(CSP)与周期啁啾(CGP)的等效,利用带有CSP的高双折射取样光纤光栅(Hi-Bi SFBG)制成多信道PMD补偿器,不同信道等效的啁啾系数不同,从而可同时实现多个信道的PMD补偿。实验中,实现了40Gb/s的传输系统中最大58.6 ps的差分群时延(DGD)补偿,补偿后,信号眼图张开度有明显改善,从而证明了该PMD补偿器的有效性与可行性。 相似文献
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利用高双折射啁啾光纤光栅补偿偏振模色散 总被引:5,自引:1,他引:4
利用具有光敏性的保偏光纤,制成高双折射啁啾光纤光栅(FBG)。将其作为偏振模色散(PMD)补偿器的关键器件,进行了一阶PMD补偿实验,补偿量为40~50ps,具有很好的补偿效果。 相似文献
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文章提出一种基于磁场变化对均匀周期光纤光栅(FBG)引入线性啁啾的特性来实现可调整偏振模色散(PMD)补偿的技术。这种全光型PMD补偿技术在实现调整的同时能保持中心波长固定不变,而且能够灵活方便地实现不同的微分群时延量(DGD)。针对10Gbit/s非归fig(NRZ)传输系统,采用这种技术对进行PMD补偿的模拟计算结果表明,接收信号的眼图在补偿后得到了显著改善。 相似文献
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全光DWDM网络偏振模色散(PMD)分析及其均衡方案 总被引:2,自引:0,他引:2
偏振模色散(PMD)已成为长距离高速率数据光网络的主要限制因素。首先分析了偏振模色散产生的机理,然后对偏振模色散建立了理论模型.以此为基础,提出了全光DWDM网络的PMD多通道同时均衡的方案。 相似文献
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高速传输系统的偏振模色散补偿技术 总被引:1,自引:1,他引:0
随着光网络的快速发展,系统的传输码率逐渐提升,传输技术也不断地发展和完善。光纤传输系统中的各种因素造成的影响程度也出现了很大的变化。针对偏振模色散(PMD)对高速光纤传输系统造成的损害,对目前光域和电域的PMD补偿技术进行详细的阐述。通过比较各种方案,指出高速光纤传输系统中PMD的光域补偿技术更适用,发展空间大,而且性能好。其中光纤光栅补偿技术应用广泛,对单信道和多信道传输系统都适用。因此,光纤光栅技术最具发展潜力。 相似文献
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随着光纤通信系统的不断发展,单模光纤的偏振模色散( PMD)对DWDM的影响越来越引起人们的重视,本文简要分析了PMD产生的原因和对DWDM系统的影响,并结合日常工作经验,着重阐述了如何减少单模光纤PMD对DWDM的影响. 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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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
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为了实现对脉冲位置调制传输系统光纤信道中偏振模色散的动态监测,提出了一种新型偏振膜色散监测方案,并基于监测原理构建了数学模型。该方案基于单边带内不同偏振信号相位差实现,具有结构简单、易于实现、成本低等优点。结果表明,本方案可以实现对光信号的差分群延时与偏振态的动态监测,即当差分群延时在0ps~100ps范围内时,可准确监测;同时证实了其与信号速率关系较小,能够适应不同速率的系统,且可对脉冲位置调制传输系统的偏振模色散进行实时动态监测。该方案是一个高效可行的偏振模色散监测方案。 相似文献
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Emulator of first- and second-order polarization-mode dispersion 总被引:4,自引:0,他引:4
Contrary to approaches which try to mimic a standard fiber as closely as possible, the emulator presented here gives constant (but user adjustable) values for differential group delay (DGD) and ratio of first- to second-order polarization-mode dispersion (PMD). Once it is set, the ratio is conserved while the DGD can be easily varied within a range of 0-300 ps. This allows to investigate the low-probability events of large DGD and second-order PMD important for system outage 相似文献
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A system experiment is reported in which polarisation mode dispersion (PMD) and chromatic dispersion (CD) compensation was achieved using an SiGe IC linear equaliser, with a transmission rate of 100 bit/s over 95 km of standard single-mode fibre (DL=1600 ps/nm). Full equalisation was obtained, with a differential group delay (DGD) of <65 ps and a penalty reduction to 3.4 dB for DGD=100 ps 相似文献
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Polarization mode dispersion (PMD) limits optical fiber capacity. PMD compensators usually minimize the associated eye closure. This measure scales with the square of the differential group delay (DGD) and makes it difficult to detect low DGDs. However, light with a low-speed polarization modulation suffers arrival time variations, in the presence of PMD, that are proportional to the DGD. These are detected by integrating the voltage-controlled oscillator (VCO) input signal of the clock recovery phase-locked loop (PLL). This novel method has been demonstrated for 40 Gb/s nonreturn-to-zero (NRZ) and for 2×40 Gb/s return-to-zero (RZ) polarization division multiplex transmission. PMD detection sensitivities range between 2 ps and 84 fs 相似文献
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《Lightwave Technology, Journal of》2009,27(3):158-167