Abstract
By exploiting helical gratings (HGs), we propose and simulate flexible generation, conversion, and exchange of fiber-guided orbital angular momentum (OAM) modes. HGs can enable the generation of OAM modes, and the OAM conversion between two arbitrary modes guided in fibers. A specific HG can exchange the OAM states of a couple of OAM modes, i.e., OAM exchange. In addition, a Fabry–Perot (F–P) cavity cascaded with two identical reflective HGs can reflect converted OAM modes with a comb spectrum. The HG-based generation/conversion/exchange of OAM modes are dependent on helix period, orientation, and the fold number of helical fringes. The proposed method of generation, conversion, and exchange of fiber-guided OAM modes using HGs is flexible and well compatible with OAM fibers, featuring a high conversion efficiency close to 100% and a conversion bandwidth about 10 nm in transmission spectra, while less than 1 nm in reflection spectra.
© 2015 Optical Society of America
Full Article | PDF ArticleMore Like This
Hua Zhao, Peng Wang, Takuya Yamakawa, and Hongpu Li
Opt. Lett. 44(21) 5370-5373 (2019)
Min Zhou, Zhe Zhang, Tao Zou, Laipeng Shao, Shen Liu, Zhiyong Bai, Yu Pang, Yu Liu, and Yiping Wang
Opt. Lett. 47(15) 3896-3899 (2022)
Shuhui Li, Qi Mo, Xiao Hu, Cheng Du, and Jian Wang
Opt. Lett. 40(18) 4376-4379 (2015)