Coupled-Mode Theory of Multipath Interference in Quasi-Single Mode Fibers
Coupled-Mode Theory of Multipath Interference in Quasi-Single Mode Fibers
复制标题
准单模光纤中多径干扰的耦合模理论
DOI：
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发表时间：
2015
影响因子：
2.4
通讯作者：
K. Koreshkov
中科院分区：
文献类型：
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作者：
M. Mlejnek;I. Roudas;J. Downie;N. Kaliteevskiy;K. Koreshkov
利用功率耦合模理论研究了准单模光纤中多径干扰（MPI）与差模衰减（DMA）的相互作用。假设QSM光纤中的两种模式传播导出的解析表达式表明，MPI作为低DMA和高DMA的跨度长度的函数而不同地缩放。此外，我们推导出使用QSM光纤的长距离相干光通信系统的性能改善的解析表达式，考虑到多余损耗和MPI对系统性能的影响。从这些表达式中，我们计算出不同DMA值的最大允许耦合系数。例如，我们表明，有效面积为250 μm2，耦合系数κ ≤ 6 × 10-4 km-1，DMA等于4 dB/km的QSM光纤在100 km的跨度上比参考纯石英芯单模光纤提供了1 dB的性能优势。
We use the power coupled-mode theory to study the interplay between multipath interference (MPI) and differential mode attenuation (DMA) in quasi-single mode (QSM) fibers. The analytical expressions derived assuming two mode propagation in QSM fibers show that MPI scales differently as a function of the span length for low and high DMA. Furthermore, we derive analytical expressions for the performance improvement of long-haul coherent optical communication systems using QSM fibers, taking into account the impact of excess loss and MPI on system performance. From these expressions, we calculate the maximum allowable coupling coefficient for different values of the DMA. We show, for example, that a QSM fiber with an effective area of 250 μm2, a coupling coefficient κ ≤ 6 × 10-4 km-1, and DMA equal to 4 dB/km offers a 1-dB performance advantage over a reference pure silica core single-mode fiber for spans of 100 km.