We propose a design strategy of elliptical core few-mode fiber (e-FMF) that supports three spatial modes with enhanced mode spacing between LP11a and LP11b, to suppress intra-mode coupling during mode-division multiplexing (MDM) transmission. Our theoretical investigations show that there exist two optimization regimes for the e-FMF, as a comparison with traditional circular core FMF(c-FMF). At the regime of three-mode operation, there occurs a trade-off between mode spacing and bending-induced loss. Meanwhile, in terms of five-mode regime, a trade-off between mode spacing and high-order mode crosstalk happens. Finally, we fabricate 7.94 km e-FMF with the optimal parameters, based on the commercial fiber manufacture facility. The primary characterizations at 1550 nm show that three spatial modes of e-FMF can be transmitted with a loss less than 0.3 dB/km. Meanwhile, -22.44 dB crosstalk between LP11a and LP11b is observed, even when the 2 km e-FMF is under stress-induced strong perturbation. (C) 2016 Optical Society of America
展开▼
机译:我们提出了一种椭圆型纤芯少模光纤(e-FMF)的设计策略,该方案支持LP11a和LP11b之间具有增强的模间距的三种空间模,以抑制模分复用(MDM)传输期间的模内耦合。我们的理论研究表明,与传统的圆芯FMF(c-FMF)相比,e-FMF存在两种优化机制。在三模式运行状态下,在模式间隔和弯曲引起的损耗之间会进行权衡。同时,就五模态而言,在模间距与高阶模串扰之间会进行权衡。最后,我们根据商业光纤生产设施制造出具有最佳参数的7.94 km e-FMF。在1550 nm处的主要特征表明,可以以小于0.3 dB / km的损耗传输e-FMF的三种空间模式。同时,即使2 km e-FMF在应力引起的强烈扰动下,也观察到LP11a和LP11b之间的串扰为-22.44 dB。 (C)2016美国眼镜学会
展开▼