【摘要】 基于空分复用技术的多芯光纤通信核心指标之一是信道串扰，该问题的存在极大地影响着传输距离及信号质量，尤其是在宽带光纤放大系统中。本文重点讨论了弱耦合19芯光纤的串扰问题，同时提出了一种利于多组分碲酸盐玻璃挤压制备的沟槽辅助型19芯光纤，并采用耦合功率理论和有限元法对模型进行了相关性能的数值仿真，系统研究了沟槽尺寸、折射率分布及相关光纤参数对芯间串扰的影响。仿真结果表明，优化设计后的光纤在1 550 nm处拥有-156 dB/100 m的低串扰值，可以满足大容量光纤通信用宽带光放大器的应用需求。更多还原

【Abstract】 Channel crosstalk is one important feature of multi-core fiber communication based on space division multiplexing technology, which could affect the signal quality and transmission distance of the broadband fiber amplification system. This paper is focused on the crosstalk problems of a 19-core weak coupling optical fiber, as that can benefit much to develop high-volume communicating fiber based on fiber extrusion technology. Then, the optical coupling theory and finite element method are adopted to complete the numerical simulation of fiber performance, here, key parameters of groove size, core refractive index distribution and their influence on the crosstalk of the fiber are optimized wholly. The simulation results show that the optimized fiber has a low crosstalk of-156 dB/100 m at 1 550nm, which could meet the requirements of future long-distance high-capacity optical fiber communication.更多还原