Two-Stage SPM-Based All-Optical 2R Regeneration by Bidirectional Use of a Highly Nonlinear Fiber
Two-Stage SPM-Based All-Optical 2R Regeneration by Bidirectional Use of a Highly Nonlinear Fiber
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DOI：
10.1109/jqe.2008.2003493
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发表时间：
2009
影响因子：
2.5
通讯作者：
M. Matsumoto;Y. Shimada;H. Sakaguchi
中科院分区：
文献类型：
--
作者：
M. Matsumoto;Y. Shimada;H. Sakaguchi
基于非线性光纤中自相位调制引起的频谱展宽和随后的偏心滤波，仅使用一个光纤轴实现了两级全光2R(再放大和整形)信号再生，其中信号在相反方向上传输两次。两级结构允许再生器无波长移位运行。环路信号传输和再生实验表明，对于不等间距的40 GB/S短脉冲串，双向2R再生器将传输距离延长了两倍以上，最小脉冲间隔为12.5ps。对双向结构中瑞利后向散射的影响进行了数值模拟，结果表明，尽管在较高的运行速度下(如80 Gb/S)会出现一些瑞利后向散射的影响，但双向两级再生仍然可以达到很强的降噪效果。
Two-stage all-optical 2R (reamplification and reshaping) signal regeneration based on spectrum broadening due to self-phase modulation in a nonlinear fiber and subsequent off-centered filtering is demonstrated by the use of only one fiber spool in which the signal is transmitted twice in opposite directions. The two-stage configuration allows wavelength shift-free operation of the regenerator. Recirculating-loop signal transmission and regeneration experiment shows that the bidirectional 2R regenerator extends transmission distance by a factor more than two for an unequally-spaced 40 Gb/s short-pulse train with minimum pulse separation of 12.5 ps. Numerical simulation for assessing the influence of Rayleigh backscattering in the bidirectional configuration is performed, which shows that although some influence of Rayleigh backscattering can appear at higher operation speeds such as 80 Gb/s, strong noise reduction is still achievable by the bidirectional two-stage regeneration.