A kind of bending-insensitive multicore fiber (MCF) is proposed. The core adopts a low-mode gradient index structure to form a seven-core few-mode fiber. The finite element method is used to simulate and analyze the bending loss of the central core and the outer core, the crosstalk between the core modes, and the influence of core parameters on the crosstalk performance. Data simulation results show that even for a small bending radius of 5 mm, the bending loss of this MCF is much lower than the attenuation loss of the fiber, and the crosstalk between the adjacent cores is less than −20 dB. Therefore, independent information transmission between cores can still be realized under a small bending radius.

中文翻译：

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弯曲不敏感多芯光纤的数值研究

提出了一种弯曲不敏感多芯光纤（MCF）。纤芯采用低模梯度折射率结构，组成七芯少模光纤。采用有限元方法对中心纤芯和外纤芯的弯曲损耗、纤芯模式间的串扰以及纤芯参数对串扰性能的影响进行模拟分析。数据仿真结果表明，即使是5 mm的小弯曲半径，该MCF的弯曲损耗也远低于光纤的衰减损耗，相邻纤芯之间的串扰小于-20 dB。因此，在较小的弯曲半径下，仍然可以实现核心之间的独立信息传输。