OAM modes generator and multiplexer by silicon waveguides

Hengying Cao; He-Ming Chen; Xiuli Bai

doi:10.1117/12.2558075

17 April 2020 OAM modes generator and multiplexer by silicon waveguides

Hengying Cao, He-Ming Chen, Xiuli Bai

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 114550E (2020) https://doi.org/10.1117/12.2558075
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

Based on an integrated silicon platform, we propose a device for generating and multiplexing optical orbital angular momentum modes(OAM), which is consisted of asymmetric directional couplers and trench waveguides. Asymmetric directional coupler is composed of single-mode and multi-mode waveguides . According to the principle of phase matching, the fundamental mode TE₀₀ is coupled to the second-order mode via an asymmetric directional coupler. Single-trench waveguide can support two orthogonal eigenmodes. By adjusting the phase difference of two orthogonal eigenmodes to make them degenerate, they can be converted into orbital angular momentum modes with topological charges of +1, 0, -1, and multiplexed in the second trench. We simulate and analyze the characteristics of the device using three-dimensional finite difference domain method (3D-FDTD). The simulation results show that the device can realize the generation and multiplex of orbital angular momentum modes with topological charges +1, 0, -1. The proposed device is very compact with a footprint of 92 μm×5.3 μm and an insertion loss of 0.359 dB. The structure woks on a wavelength range from 1.48 μm to 1.57 μm. The structure is simple and easy to integrate, having a good application in OAM multiplexing system.

Citation Download Citation

Hengying Cao, He-Ming Chen, and Xiuli Bai "OAM modes generator and multiplexer by silicon waveguides", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 114550E (17 April 2020); https://doi.org/10.1117/12.2558075

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KEYWORDS

Waveguides

Silicon

Multiplexers

Directional couplers

Multiplexing

Spiral phase plates

Telecommunications

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