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将多芯光纤与无芯空气孔结构结合,设计了一种具有大模场面积的十九芯双模光纤结构.该结构由位于中心的5根常规纤芯及环绕其周围的14根空气纤芯按正六边形排布构成,能实现稳定的双模传输,其基模有效模场面积的最小值约为285.10μm~2.系统地分析了影响模式传输特性和模式有效模场面积的结构参数:纤芯间距、相对折射率差和纤芯大小.通过对这三个参数的优化,在双模传输的条件下,增大基模的有效模场面积.此外,具有大模场面积的多芯双模光纤结构具有良好的抗弯曲特性,基模弯曲损耗小于5×10~(-5)dB/m.该结构还具有制作简单、设计灵活等优点,适用于高功率光纤激光器和光纤放大器.
The multi-core fiber and coreless air hole structure combined with the design of a large mode field area nineteen core dual-mode fiber structure.This structure consists of 5 in the center of the conventional core and the surrounding air around the 14 fibers The core is arranged in a regular hexagonal arrangement to achieve stable dual mode transmission with the minimum effective mode field area of the base mode of about 285.10 μm ~ 2. A systematic analysis of the structure affecting the mode transmission characteristics and mode effective mode field area Parameters: core-to-core spacing, relative index difference and core size.By optimizing these three parameters, the effective mode field area of the fundamental mode is increased under the condition of dual-mode transmission.In addition, The multi-core dual-mode fiber structure has good bending resistance and the bending loss of the fundamental mode is less than 5 × 10 -5 dB / m. The structure has the advantages of simple fabrication and flexible design, and is suitable for high-power fiber lasers and optical fibers Amplifier.