基于传统光纤的涡旋光复用通信研究进展

大数据时代的飞速发展给光通信系统带来了巨大的压力和挑战，高速大容量光通信成为发展的必然趋势.随着光波传统物理维度资源的开发利用趋于极限，基于横向空间维度的涡旋模式复用技术在提升传输容量方面备受瞩目.除了各种特殊设计的环形结构光纤外，广泛铺设的传统光纤也能够支撑涡旋模式复用通信.该文回顾了传统光纤中涡旋光复用通信的研究进展，首先介绍了光纤中不同模式基的特征和用于传统光纤模分复用传输的性能，其次重点介绍了传统单模光纤和多模光纤中支持涡旋模式的特性，随后详述了基于传统多模光纤的涡旋光复用通信以及利用其他模式基复用通信的研究进展，最后进行了展望和总结.

Progress in Vortex-Multiplexed Communications Based on Conventional Fibers

The rapid development in big data era brings tremendous pressure and challenge to optical communication system. High-speed and large-capacity optical communication has become an inevitable trend of development. Besides the extensive exploitation of traditional physical dimensions of optical waves, vortex mode multiplexing technique based on the transverse spatial dimension has attracted great attention for the improvement of transmission capacity. Except for specially designed ring-core fibers, the widely deployed conventional fibers are also capable of supporting vortex mode multiplexing communication. This paper reviews the research progress of vortex-multiplexed communications based on conventional fibers. First, the characteristics and performance for mode-division multiplexing (MDM) transmission of different mode bases in conventional fibers are introduced. Second, vortex mode properties in conventional single-mode fiber (SMF) and multi-mode fiber (MMF) are comprehensively investigated, and the research progress of vortex-multiplexed communications based both on MMF and on other mode bases are reviewed and discussed. Finally, the future of vortex-multiplexed communication is prospected.