Chinese Optics Letters, Vol. 17, Issue 12, 120601 (2019)
Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers
Zhouxiang Wang1, Yuchen Xie1, Shuangyin Huang1, Han Zhou1, Rui Liu1, Zhifeng Liu1, Min Wang1, Wenrong Qi1, Qianqian Tian1, Lingjun Kong2, Chenghou Tu1, Yongnan Li1, and Huitian Wang2,*
- 1School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
- 2National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
In free-space or in optical fibers, orbital angular momentum (OAM) multiplexing for information transmission has been greatly developed. The light sources used were well coherent communication bands, and the fibers used were customized. Here, we use an 810 nm femtosecond laser to generate optical vortices carrying OAM and then feed them into two kinds of commercial step-index few-mode fibers to explore the transmission characteristics of OAM modes. We also propose a method without multiple-input multiple-output digital signal processing to identify the input OAMs. It is of great guiding significance for high-dimensional quantum information experiments via the OAMs as a degree of freedom, using the light generated by the spontaneous parametric down-conversion as the source and the commercial fibers for information transmission.