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时延纹波
相关语句
  time delay ripple
    Impact of Phase Masks′ Stitching Errors on the Time Delay Ripple of the Chirped Fiber Bragg Grating
    相位掩模板接缝相差对光栅时延纹波的影响
短句来源
    The results show that,compared with symmetrical apodization method,the asymmetrical apodization method can avoid the disadvantage of the former method that widens the reflectivity bandwidth by reduction of apodization ratio,which meanwhile increases the time delay ripple. The left-shifted apodization method can reduced the time delay ripple by 43.5%,adjacent with the experimental result of 39.9%,while the refectivity spectrum is nearly unchanged.
    结果表明,与对称切趾相比,左移非对称切趾可避免对称切趾中为增大反射谱带宽而减小切趾比例使时延纹波增大的缺点,在保持反射谱纹波基本不变的前提下将时延曲线纹波降低了43.5%(与实验结果39.9%相吻合)。
短句来源
  delay ripple
    Impact of Phase Masks′ Stitching Errors on the Time Delay Ripple of the Chirped Fiber Bragg Grating
    相位掩模板接缝相差对光栅时延纹波的影响
短句来源
    The results show that,compared with symmetrical apodization method,the asymmetrical apodization method can avoid the disadvantage of the former method that widens the reflectivity bandwidth by reduction of apodization ratio,which meanwhile increases the time delay ripple. The left-shifted apodization method can reduced the time delay ripple by 43.5%,adjacent with the experimental result of 39.9%,while the refectivity spectrum is nearly unchanged.
    结果表明,与对称切趾相比,左移非对称切趾可避免对称切趾中为增大反射谱带宽而减小切趾比例使时延纹波增大的缺点,在保持反射谱纹波基本不变的前提下将时延曲线纹波降低了43.5%(与实验结果39.9%相吻合)。
短句来源
  time delay ripple
    Impact of Phase Masks′ Stitching Errors on the Time Delay Ripple of the Chirped Fiber Bragg Grating
    相位掩模板接缝相差对光栅时延纹波的影响
短句来源
    The results show that,compared with symmetrical apodization method,the asymmetrical apodization method can avoid the disadvantage of the former method that widens the reflectivity bandwidth by reduction of apodization ratio,which meanwhile increases the time delay ripple. The left-shifted apodization method can reduced the time delay ripple by 43.5%,adjacent with the experimental result of 39.9%,while the refectivity spectrum is nearly unchanged.
    结果表明,与对称切趾相比,左移非对称切趾可避免对称切趾中为增大反射谱带宽而减小切趾比例使时延纹波增大的缺点,在保持反射谱纹波基本不变的前提下将时延曲线纹波降低了43.5%(与实验结果39.9%相吻合)。
短句来源
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  delay ripple
The effect of the group delay ripple of the fiber grating is also investigated in the recirculating systems, and it is shown that the transmission distance is limited to 4 cycles (4×167.1km) in the loop with the power penalty fluctuation below 1.0dB.
      
Thus the group delay ripple should be reduced to allow for the wavelength drift of ±5GHz.
      
We describe the theory of the group delay ripple (GDR) generated by apodized chirped fiber gratings using the analogy between noisy gratings and superstructure Bragg gratings.
      
Dispersion compensator imperfections, such as multi-path interference, group delay ripple, insertion loss ripple and limited per-channel compensation bandwidth, place additional limitations on the achievable transmission distance and capacity.
      
In the second section we describe the techniques used to fabricate high performance dispersion compensation gratings as well as the theory of the primary defect of fiber grating dispersion compensation: group delay ripple (GDR).
      
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The strain effect on fiber Bragg grating (FBG) wavelength, 3 dB bandwidth reflectivity and characterizatin of delay is experimentally studied. Change of the center wavelength and 3 dB bandwidth is linear with the strain, but the reflectivity decreases when the strain increases. Linearity of delay becomes better, root-mean-square deviation of delay ripple reduced and compensation lessens, when the strain increases.

对光纤光栅在应力作用下光栅的中心波长、带宽、时延进行了研究,实验中发现光栅的中心波长、带宽随应力改变而呈线性变化,时延的线性度在光栅拉伸时变得更好,时延纹波减小,补偿量减小,光栅的反射率也减小。

The generation of group delay ripple and reflection sideband is explained by the oscillazation theory.And the effect of non-constant change of averaged index modulation induced by the one-side exposure apodization on the characteristics of chirped gratings is analyzed for the first time.The mechanism of apodization to enhance the performance of chirped fiber Bragg gratings is studied also.Based on the study,a simple apodization method to improve the performance of chirped fiber gratings is proposed,in which...

The generation of group delay ripple and reflection sideband is explained by the oscillazation theory.And the effect of non-constant change of averaged index modulation induced by the one-side exposure apodization on the characteristics of chirped gratings is analyzed for the first time.The mechanism of apodization to enhance the performance of chirped fiber Bragg gratings is studied also.Based on the study,a simple apodization method to improve the performance of chirped fiber gratings is proposed,in which only one-sided exposure is needed which is easy to realize.

利用谐振理论对啁啾光纤光栅时延纹波和反射谱边瓣的形成原因进行了分析,研究了单侧曝光切趾方式中引入的非常数直流折射率调制分量对啁啾光栅特性的影响,阐明了切趾技术提高啁啾光纤光栅性能的作用机理,提出了一种能够使啁啾光纤光栅获得优化性能的切趾方法,该方法只需对光栅进行单侧曝光,实现简单.

The chirped electron-beam written phase mask is fabricated by step-chirped method.The step-chirped phase mask is a useful and powerful device to realize a nonlinearly or linearly stepwise chirped fiber grating with broad bandwidth.But the stitching errors of electron-beam written phase masks always occur between neighboring sections.The stitching errors can arouse the time delay ripple of chirped fiber Bragg gratings(CFBGs).The 140 mm CFBGs,which are written by using 2.0 mm,1.4 mm,1.0 mm and 0.5 mm stepwise...

The chirped electron-beam written phase mask is fabricated by step-chirped method.The step-chirped phase mask is a useful and powerful device to realize a nonlinearly or linearly stepwise chirped fiber grating with broad bandwidth.But the stitching errors of electron-beam written phase masks always occur between neighboring sections.The stitching errors can arouse the time delay ripple of chirped fiber Bragg gratings(CFBGs).The 140 mm CFBGs,which are written by using 2.0 mm,1.4 mm,1.0 mm and 0.5 mm stepwise chirped phase mask,have been studied by simulation and experiment.The best is the 1.4 mm step-chirped mask.The simulation agrees with the experiment well.

掩模板制造过程中采用的是分步啁啾方法,分步间长度容易出现误差,这种接缝误差是引起啁啾光纤光栅(CFBG)时延纹波的系统误差。理论分析了相位掩模板的接缝误差对CFBG时延纹波的影响。分析表明,对长度为140mm的掩模板采用1.4mm的步长,接缝误差影响最小。并进行了实验验证。

 
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