We propose an angular division multiplexing in new designed multicore plastic optical fiber with seven cores arranged in a hexagonal array. The influence of mode coupling on two-channel angular division multiplexing capability in each of seven cores is investigated by solving the power flow equation. Our numerical results show that mode coupling significantly limits the fiber length at which the angular division multiplexing can be realized in each of seven cores with a minimal crosstalk between two neighbor angular optical channels. Two angular channels in the proposed seven-core plastic optical fiber can be employed with a minimal crosstalk up to the fiber length which is about 20% of the coupling length (fiber length where equilibrium mode distribution is achieved). Such characterization of multicore optical fibers should be considered in designing a multicore optical fiber transmission system for space division multiplexing.

中文翻译：

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模耦合对七芯塑料光纤角分复用的影响

我们建议在新设计的多芯塑料光纤中进行角分复用，七芯以六边形阵列排列。通过求解潮流方程，研究了模式耦合对七个核中每个核的两通道角分复用能力的影响。我们的数值结果表明，模式耦合显着限制了可以在七个纤芯中的每个纤芯中实现角分复用的光纤长度，并且两个相邻的角形光学通道之间的串扰最小。可以使用提议的七芯塑料光纤中的两个角形通道，且串扰最小，直至光纤长度约为耦合长度（达到平衡模式分布的光纤长度）的20％。