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当前光通信网络正朝着大规模、大容量的方向迅速发展,传输带宽所面临的巨大增长压力对通信光纤提出了更高的要求。在此背景下,基于空分复用的多芯光纤充分利用了空间维度,可以有效解决传统单模光纤的理论传输容量极限导致的容量紧缩问题,而大容量传输系统要求多芯光纤具有低串扰大模场面积的光学特性。通过采用光束传输法和有限元法模拟仿真了多芯光纤中各结构参量对芯间串扰和有效模场面积的影响,并利用两种不同参数的多芯光纤进行了实验验证,对芯间距、纤芯/沟道的尺寸和折射率进行了优化,在理论上完成了串扰小于-45dB、模场面积大于130μm2多芯光纤的设计。
Currently, the optical communication network is developing rapidly in the direction of large-scale and large-capacity. The huge growth pressure of transmission bandwidth puts higher demands on the communication optical fiber. In this context, space-division multiplexing based multi-core optical fibers make full use of the space dimension, which can effectively solve the problem of capacity reduction caused by the theoretical transmission capacity limit of traditional single-mode optical fibers. However, the large-capacity transmission system requires that the multi- Optical properties of large mode field area. The effects of various structural parameters on the crosstalk and effective mode field area of the multi-core fiber are simulated and simulated by using the beam propagation method and the finite element method. The multi-core fiber with two different parameters is used to verify the effect of the core- Fiber core / channel size and refractive index are optimized, in theory, completed a crosstalk less than -45dB, mode field area greater than 130μm2 multi-core fiber design.