Abstract
There is interest in using orbital angular momentum (OAM) modes to increase the data speed of free-space optical communication. A prevalent challenge is the mitigation of mode-crosstalk and mode-dependent loss that is caused by the modes’ lateral displacement at the data receiver. Here, the mode-crosstalk and mode-dependent loss of laterally displaced OAM modes (, ) are experimentally compared to that of a Hermite–Gaussian (HG) mode subset (, ). It is shown, for an aperture larger than the modes’ waist sizes, some of the HG modes can experience less mode-crosstalk and mode-dependent loss when laterally displaced along a symmetry axis. It is also shown, over a normal distribution of lateral displacements whose standard deviation is the modes’ waist sizes, on average, the HG modes experience 66% less mode-crosstalk and 17% less mode-dependent loss.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Kai Pang, Haoqian Song, Zhe Zhao, Runzhou Zhang, Hao Song, Guodong Xie, Long Li, Cong Liu, Jing Du, Andreas F. Molisch, Moshe Tur, and Alan E. Willner
Opt. Lett. 43(16) 3889-3892 (2018)
Yongxiong Ren, Cong Liu, Kai Pang, Jiapeng Zhao, Yinwen Cao, Guodong Xie, Long Li, Peicheng Liao, Zhe Zhao, Moshe Tur, Robert W. Boyd, and Alan E. Willner
Opt. Lett. 42(23) 4881-4884 (2017)
Zhen Qu and Ivan B. Djordjevic
Opt. Lett. 42(16) 3125-3128 (2017)