Abstract
We propose a fiber coupler consisting of a central ring and four external cores to generate up to ten orbital angular momentum (OAM) modes. Four coherent input lights are launched into the external cores and then coupled into the central ring waveguide to generate OAM modes. By changing the size of the external cores, one can selectively excite a high-order OAM mode. The quality of the generated OAM modes can be enhanced by adjusting the polarization state and the phase of input lights. We show the generation of OAM modes with odd charge numbers of to (i.e., 10 modes totally) with mode purity of using long fiber. This fiber coupler design can be extended to enable all-fiber spatial-mode (de)multiplexing.
© 2011 Optical Society of America
Full Article | PDF ArticleMore Like This
Yan Yan, Lin Zhang, Jian Wang, Jeng-Yuan Yang, Irfan M. Fazal, Nisar Ahmed, Alan E. Willner, and Samuel J. Dolinar
Opt. Lett. 37(16) 3294-3296 (2012)
Yan Yan, Yang Yue, Hao Huang, Jeng-Yuan Yang, Mohammad R. Chitgarha, Nisar Ahmed, Moshe Tur, Samuel. J. Dolinar, and Alan E. Willner
Opt. Lett. 37(17) 3645-3647 (2012)
S. Pidishety, S. Pachava, P. Gregg, S. Ramachandran, G. Brambilla, and B. Srinivasan
Opt. Lett. 42(21) 4347-4350 (2017)