Zero-broadening SBS slow light propagation in an optical fiber using two broadband pump beams.
Zero-broadening SBS slow light propagation in an optical fiber using two broadband pump beams.
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DOI：
10.1364/oe.16.008067
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发表时间：
2008-05
期刊：
影响因子：
3.8
通讯作者：
Shih-Chang Wang;Liyong Ren;Yu Liu;Y. Tomita
中科院分区：
文献类型：
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作者：
Shih-Chang Wang;Liyong Ren;Yu Liu;Y. Tomita
提出了一种利用两束不同功率和谱宽的高斯型宽带泵浦光来剪裁受激布里渊散射增益谱的新方法。两束泵浦光的中心频率间隔被精心设置为两个固有布里渊频移，确保一束泵浦光的增益谱与另一束泵浦光的损耗谱具有相同的中心频率。不同的增益分布，获得和分析。其中，一个特殊的增益分布被发现，确保了信号脉冲的零展宽的布里渊增益无关。这是由于增益相关的正展宽和群速度色散相关的负展宽之间的补偿。还发现了两束泵浦光之间的关系，以构造这样的增益分布。这为我们提供了一种通过人工构造和优化增益谱来控制SBS慢脉冲展宽的新思路。
A new method of tailoring stimulated Brillouin scattering (SBS) gain spectrum for slow light propagation is proposed by use of two Gaussian-shaped broadband pump beams with different powers and spectral widths. The central frequency interval between the two pump beams are carefully set to be two inherent Brillouin frequency shift, ensuring that the gain spectrum of one pump has the same central frequency with the loss spectrum of the other one. Different gain profiles are obtained and analyzed. Among them a special gain profile is found that ensures a zero-broadening of the signal pulse independent of the Brillouin gain. This is owing to the compensation between the positive gain-dependent broadening and the negative GVD (group velocity dispersion) dependent broadening. The relationship of two pump beams is also found for constructing such a gain profile. It provides us a new idea of managing the broadening of SBS-based slow pulse by artificially constructing and optimizing the profile of gain spectrum.