提出了一种基于非对称双芯光子晶体光纤的新型宽带模式转换器。对光纤参数与模式有效折射率之间的分析,通过调整纤芯内层空气孔的直径及掺杂介质棒的折射率,使两个纤芯中需要转换的模式之间实现了宽带的相位匹配。数值模拟结果表明,一种长仅为5.9mm的双芯光纤,在保证传输损耗小于0.5dB的前提下,其工作带宽达160nm且偏振相关损耗小于0.28dB。 A novel broadband mode converter based on asymmetric dual-core photonic crystal fiber is proposed. By analyzing the parameters of the fiber and effective refractive index of the mode, by adjusting the diameter of the inner core air hole and the refractive index of the doping medium rod, wideband phase matching is realized between the modes to be converted in the two cores . The numerical simulation results show that a dual-core optical fiber with a length of only 5.9mm has a working bandwidth of 160nm and a polarization-dependent loss of less than 0.28dB under the condition that the transmission loss is less than 0.5dB.