中文摘要：

在光纤传输系统中，未来众多通信新业务对传输容量和传输速度提出了更高的需求，而采用多芯光纤（MCF）的空分复用（SDM）技术可以有效解决传统单模光纤（SMF）对传输容量的限制。本文采用光束传输法和有限元法设计了一种7芯光纤，基于优化的结构参数制备了相应的7芯光纤。搭建了MCF传输特性测试平台，对所制备的7芯光纤进行测试和分析，得其传输损耗为0．36dB／km、弯曲损耗为0．0537dB和芯径间串扰为-18．5dB。这种结构的7芯光纤制备简单，性能良好，对SDM技术的发展具有重要的推动作用。

英文摘要：

In this work, a seven-core fiber is designed with the beam propagation method and the finite el- ement method,the influence of the key parameters on the transmission properties of the seven-core fiber is investigated,and the seven-core optical fiber is fabricated with the optimized structural parameters. An experiment setup is built to characterize the multi-core fiber （MCF）,with which the transmission loss, the bending loss and the crosstalk of the seven-core optical fiber are measured. The results show a trans- mission loss of 0.36 dB/km,a bending loss of 0. 053 7 dB and a crosstalk of --18.5 dB. The seven-core fiber proposed here has the advantages of simple preparation and good performance, and could play an important role in the development of the space-division-multiplexing （SDM） technology.