Core Alignment of Butt Coupling Between Single-Mode and Multimode Optical Fibers by Monitoring Brillouin Scattering Signal
Core Alignment of Butt Coupling Between Single-Mode and Multimode Optical Fibers by Monitoring Brillouin Scattering Signal
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DOI：
10.1109/jlt.2011.2161754
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发表时间：
2011-07
影响因子：
4.7
通讯作者：
Y. Mizuno;K. Nakamura
中科院分区：
文献类型：
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作者：
Y. Mizuno;K. Nakamura
提出了一种通过监测布里渊散射光的频谱来优化单模光纤（SMF）与渐变折射率多模光纤（GI-MMF）对接耦合的纤芯对准的新方法。该方法稳定，不需要昂贵或复杂的设备，适用于不同芯径或材料的光纤耦合，即使在传输光功率无法测量的情况下也是可行的。实验结果表明，这种方法在以下三种情况下都是有效的：1）纤芯直径为50 μm的硅基单模光纤与硅基GI-MMF对接; 2）纤芯直径为62.5 μm的全氟GI聚合物光纤（PGFI-POF）对接; 3）纤芯直径为120 μm的PGFI-POF对接。随着相对纤芯位置的变化，不仅斯托克斯功率发生变化，布里渊频移也发生变化，这可能是由于高阶模的激发。
We propose a new method to optimize the core alignment of the butt coupling between a single-mode optical fiber (SMF) and a graded-index multimode optical fiber (GI-MMF) by monitoring the spectrum of Brillouin scattered light. This method is stable, free from costly or elaborate equipments, applicable to the coupling of optical fibers with different core diameters or materials, and available even when the power of transmitted light cannot be measured. We experimentally show the usefulness of this method in the following three cases: where a silica-based SMF is butt-coupled to 1) a silica-based GI-MMF with 50-μm core diameter; 2) a perfluorinated GI polymer optical fiber (PFGI-POF) with 62.5-μm core diameter; and 3) a PFGI-POF with 120-μm core diameter. Depending on the relative core position, not only the Stokes power but also the Brillouin frequency shift changed, which probably originates from the excitation of higher order modes.