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http://dx.doi.org/10.1016/j.cap.2018.08.015

Acousto-optic generation of orbital angular momentum states of light in a tapered optical fiber  

Song, Changkeun (Department of Physics, Korea Advanced Institute of Science and Technology)
Park, Hee Su (Korea Research Institute of Standards and Science)
Song, Kwang Yong (Department of Physics, Chung-Ang University)
Kim, Byoung Yoon (Department of Physics, Korea Advanced Institute of Science and Technology)
Publication Information
Current Applied Physics / v.18, no.11, 2018 , pp. 1441-1446 More about this Journal
Abstract
We demonstrate an acousto-optic mode converter based on a tapered optical fiber to efficiently generate orbital angular momentum states of light. In our scheme an acoustic wave is deployed to the waist of tapered optical fiber where two degenerate $HE_{21}$ modes leading to +1 and -1 orbital angular momentum eigen-modes are resonantly excited. The excitation of $TM_{01}$ and $TE_{01}$ modes is suppressed by enlarging the intermodal index difference between near-degenerate spatial modes. Numerical calculation for optimization of the taper diameter is provided. The experimental characterization of generated states is performed by analyzing the output far-field pattern and the spatial interference fringes with a uniform reference beam.
Keywords
Orbital angular momentum; Acoustooptic couplers; Multiplexing; Optical fiber communication; Optical fiber applications;
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