A simple OAM mode generator based on SOI strip waveguides

Ling-Fei Zhang; He-Ming Chen; Xiu-Li Bai; Yu-Yang Zhuang

doi:10.1117/12.2518281

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14 February 2019 A simple OAM mode generator based on SOI strip waveguides

Ling-Fei Zhang, He-Ming Chen, Xiu-Li Bai, Yu-Yang Zhuang

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Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104803 (2019) https://doi.org/10.1117/12.2518281
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

A simple optical orbital angular momentum (OAM) mode generator based on silicon-on-insulator (SOI) strip waveguides is proposed, which is consisted of a coupled waveguide and a trench waveguide. The fundamental mode TE₀₀ is coupled to the second-order mode via an asymmetric directional coupler. Single-trench waveguide can support two orthogonal LP-like modes whose optical axes are rotated by around 45° with respect to the horizontal and vertical directions. We simulate and analyze the mode properties and propagation effects of OAM modes with charge numbers of 1or -1 by FDTD. When the phase difference between two LP-like eigenmodes is π/2,the second-order mode is further converted to the OAM mode over a wide wavelength range from 1.43μm to 1.58μm.The simulation results indicate that the loss can achieve approximately 0.16 dB. The proposed device is very compact with footprint of <47μm×2μm and the mode conversion efficiency is over 97%. Thus, such structure of OAM mode generator is a promising candidate for applying in OAM multiplexing system and other fields.

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Ling-Fei Zhang, He-Ming Chen, Xiu-Li Bai, and Yu-Yang Zhuang "A simple OAM mode generator based on SOI strip waveguides", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104803 (14 February 2019); https://doi.org/10.1117/12.2518281

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