共查询到20条相似文献,搜索用时 140 毫秒
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本文对采用取样非线性啁啾光纤光栅用于补偿光通信系统中的动态色散进行了研究。提出了二进制取样非线性啁啾光纤光栅所产生信道个数的计算方法。对不同长度的取样光栅的一阶啁啾系数c1和二阶啁啾系数c2 的取值范围进行了研究,并进行了数值仿真。 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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冯显杰 《固体电子学研究与进展》2004,24(2):223-228
根据非线性啁啾光纤光栅可用于对光通信系统中一阶和二阶色散进行补偿的原理 ,系统地研究了二类取样型非线性啁啾光纤光栅的反射谱及时延特性 ,并进行了数值仿真。提出了计算二类取样光栅产生的信道数的计算方法。 相似文献
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用于10Gb/s WDM系统色散补偿的波长取样啁啾光纤光栅 总被引:4,自引:2,他引:4
研制出一种新型色散补偿光纤光栅--波长取样啁啾光纤光栅,它具有10个周期性为0.8nm的波长结构,每个周期的反射特性和色散特性都基本相同,其带宽为0.6nm、峰值反射率为90%、色散量为1300ps/nm、时延抖动小于50ps,光栅长度为10cm.利用此波长取样啁啾光纤光栅,在8×10Gb/s波分复用(WDM)系统中,进行了NRZ码140km标准单模光纤的色散补偿实验,补偿效果良好. 相似文献
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色散补偿型光栅是非周期光栅,采用改变光栅轴向温度场梯度,可使得光栅轴向上不同位置的反射波长发生不同的变化,从而改变啁啾量,达到调节色散的目的.基于这一理论设计了一种基于光纤布喇格光栅的可调色散补偿器,具有无机械调节运动装置,模块可靠性高,色散的调节范围可达到为800ps/nm. 相似文献
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改变啁啾光栅轴向温度场的梯度,可使得该非周期光栅轴向上不同位置的反射波长发生相应的变化,从而改变光栅的啁啾量,达到调节色散的目的.文章通过在可调色散补偿器中封装两个分别具有正、负色散的光纤布拉格光栅(FBG),实现了色散调节范围达到-900-700 ps/nm的可调色散补偿(TODC)技术.这种方式具有无机械调节运动装... 相似文献
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Phased-only sampled fiber Bragg gratings for high-channel-count chromatic dispersion compensation 总被引:5,自引:0,他引:5
Hongpu Li Yunlong Sheng Yao Li Rothenberg J.E. 《Lightwave Technology, Journal of》2003,21(9):2074-2083
Binary and multilevel phase-only sampling functions are proposed for the sampled fiber Bragg gratings (FBGs) with high channel count, which require significantly less refractive-index modulation than that does the sampled grating with amplitude sampling. The design using the new simulated quenching optimization with temperature rescaling results in high channel uniformity and minimum energy in the out-of-band channels. The technique can be applied to the sampled FBGs with very high channel count. A five-channel nonlinearly chirped multilevel phase-only sampled FBG for tunable chromatic dispersion compensation is demonstrated. 相似文献
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Purely phase-sampled fiber Bragg gratings for broad-band dispersion and dispersion slope compensation 总被引:1,自引:0,他引:1
Hojoon Lee G.P. Agrawal 《Photonics Technology Letters, IEEE》2003,15(8):1091-1093
We demonstrated numerically that both the chromatic dispersion and the dispersion slope can be compensated by using purely phase-sampled superstructure fiber Bragg gratings provided both the grating period and the sampling period are chirped linearly along the grating. Adjusting the refractive index modulation and the chirp of sampling function, they can be designed to compensate dispersion of a large number of wavelength-division-multiplexing channels. 相似文献
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《Quantum Electronics, IEEE Journal of》2009,45(8):954-961
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一种重构多信道布拉格光栅的混杂算法 总被引:3,自引:2,他引:1
由于光纤光敏性的限制,当信道数N变得很大时,采用幅度取样方式制作多信道光栅将变得非常困难.通过相位取样来制作多信道光栅被证明是一种能有效降低峰值折变量的方法.提出一种采用逆散射技术和优化策略的混杂算法有效地设计多信道光栅.由遗传算法进行优化,得到每一个信道相应的相位因子的最优值,改进了多信道光栅复杂的反射谱.再由Layer-peeling算法为依据引入了相位因子后的频谱响应重构光栅.通过对信道间相对相位的优化,制作这种多信道光栅所需的峰值折变量降低为单信道光栅的√N倍.经过数值仿真,得到8信道光栅的峰值折变量大约为单信道光栅的√8倍. 相似文献
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Efficient technique for increasing the channel density in multiwavelength sampled fiber Bragg grating filters 总被引:3,自引:0,他引:3
Chinhua Wang J. Azana L.R. Chen 《Photonics Technology Letters, IEEE》2004,16(8):1867-1869
We introduce a new class of high channel count multiwavelength comb filters based on sampled fiber Bragg gratings (FBGs). Our approach exploits the spectral fractional Talbot effect in sampled chirped FBGs (S-CFBGs). For specific conditions between the grating chirp and sampling period, the channel spacing can be reduced compared to the value obtained using conventional sampling techniques. In this way, the channel density can be multiplied without needing to increase the sampling period. Moreover, despite the fact that the grating is chirped, operating under the spectral Talbot regime ensures that the resultant in-band group delay characteristics are similar to those of a sampled uniform period FBG. 相似文献
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Hongpu Li Y. Sheng 《Photonics Technology Letters, IEEE》2003,15(9):1252-1254
The conventional sampling approach fails when the seed grating contains phase shifts because this approach is based on the resonant coupling principle, which explains the multichannel spectrum formation but does not provide an accurate solution. We use the discrete layer-peeling algorithm for directly synthesizing the multichannel grating. The new method restores the channel distortion in the sampled grating, resulting in uniform reflection and dispersion spectrum channels. We introduce further an optimized set of channel phases, such that the maximum reflective index modulation required for N channels is only /spl radic/N times that for the single channel. 相似文献
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