纤芯激光功率密度过高，易引起非线性效应,导致激光损伤，限制光纤激光器输出功率的提高，采用多芯光纤是解决这一问题的有效方案之一。同相位超模的选择和多芯光纤的制作是影响多芯光纤激光器发展的主要因素，因此实现同相位超模运转的大模场面积多芯光纤研究成为近年来国内外研究人员关注的热点。详细介绍了当前多芯光纤选模及制造技术的研究进展，通过对比几种技术方案的可行性，展望了高功率多芯光纤激光器单模运转的发展前景。

Excessively high laser power density of the fiber core causes nonlinear effect and laser damage, which limits the output power enhancement of the fiber lasers. Using the multi-core fiber is one of the most effective schemes to solve this problem. The selection of in-phase supermode and the fabrication of multi-core fiber are the key factors for limiting the progress in multi-core fiber lasers. Therefore, how to realize a multi-core fiber with a large mode area and an in-phase supermode has attracted the attention of domestic and foreign researchers in recent years. The latest progress in mode selection and fabrication technology for multi-core fibers is illustrated, and the development prospect of realizing high power single-mode multi-core fiber lasers is proposed by evaluating the feasibility of several technical solutions.