应用模式耦合理论系统地研究了空气孔辅助六芯光纤的耦合特性。特别考虑了非临近纤芯对互耦合系数及自耦合系数的作用,分析了光纤结构参数变化对耦合系数、串扰及模场面积的影响。研究表明,通过调整光纤的结构参数,可以充分利用光纤的横截面,有效降低纤芯间耦合,在保持低串扰(-30 dB以下)的前提下,实现较大的单芯有效面积(120~150 μm2)。

Based on mode-coupled theory,the coupling characteristics of hole-assisted six-core fiber are researched systematically. The effect of nonadjacent fiber core on mutual coupled and self-coupled parameters is especially considered. And the influence on coupled parameter,crosstalk and mode area from the changing of fiber structure parameters is analyzed. Research results show that coupled effects among fiber core can be reduced effectively by making the best of fiber cross section through adjusting the structure parameters of fiber. Under the condition of keeping low crosstalk,larger single core effective area can be achieved.