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Proceedings Paper

A compact mode sorter for demultiplexing vortex light beams
Author(s): Yuanhui Wen; Ioannis Chremmos; Yujie Chen; Jiangbo Zhu; Yanfeng Zhang; Siyuan Yu
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Paper Abstract

Optical vortex beams carrying orbital angular momentum are being widely investigated for boosting the information capacity of communication systems by virtue of their unbounded state space for spatial mode division multiplexing or high-dimensional encoding. Vortex mode sorters are a critical component in such systems and a spiral transformation scheme working in the paraxial regime for vortex mode sorting has been proposed very recently to achieve high modal resolution with unity efficiency. Here we modify the spiral transformation scheme by developing a phase corrector in the nonparaxial regime, which is confirmed to have a more accurate phase-correcting function in implementing the spiral transformation and eventually lead to a better mode separation, especially in the case of a compact vortex mode sorter. Based on the above principle, a home-made compact vortex mode sorter is demonstrated by integrating the two phase elements implementing the spiral transformation onto the opposite sides of a thin quartz plate as flat diffractive optical elements, which achieves high-resolution and high-efficiency vortex mode sorting as expected. The modified optical spiral transformation and the compact design of vortex mode sorter based on this scheme therefore provide a much better tool for the effective mode separation, which can enable new applications in both classical and quantum information systems based on vortex modes.

Paper Details

Date Published: 14 February 2019
PDF: 5 pages
Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110482O (14 February 2019); doi: 10.1117/12.2518307
Show Author Affiliations
Yuanhui Wen, Sun Yat-Sen Univ. (China)
Ioannis Chremmos, Hellenic Electricity Distribution Network Operator S. A. (Greece)
Yujie Chen, Sun Yat-Sen Univ. (China)
Jiangbo Zhu, Univ. of Bristol (United Kingdom)
Yanfeng Zhang, Sun Yat-Sen Univ. (China)
Siyuan Yu, Sun Yat-sen Univ. (China)
Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 11048:
17th International Conference on Optical Communications and Networks (ICOCN2018)
Zhaohui Li, Editor(s)

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