Effective auto-alignment and tracking of transceivers for visible-light communication in data centres

Fulin Liu; Minan Chen; Weibin Jiang; Xianqing Jin; Zhengyuan Xu

doi:10.1117/12.2506955

1 February 2019 Effective auto-alignment and tracking of transceivers for visible-light communication in data centres

Fulin Liu, Minan Chen, Weibin Jiang, Xianqing Jin, Zhengyuan Xu

Proceedings Volume 10945, Broadband Access Communication Technologies XIII; 109450N (2019) https://doi.org/10.1117/12.2506955
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In recent years, extensive investigations have been made on high-speed visible light communication (VLC) for indoor applications including data centres. For high-speed VLC systems, precise alignment between the VLC transceivers is usually required to establish an optical link with less optical loss. In this paper, an effective scheme of auto-alignment and tracking of transceivers is proposed for practical VLC systems with a high-speed camera for location of the target light source and a two-axis gimbal for initial auto-alignment between transceivers. To explore the feasibility of the proposed scheme, real-time dynamic 200 Mb/s carrierless amplitude-phase (CAP)-VLC transmission is experimentally demonstrated in ≥ 3 m VLC links with red light emitting diodes (LEDs) at an angular accuracy of ≤ 0.02º (0.35 mrad), a tracking speed of ≤ 27º/s and a latency of ≤ 21 ms. The proposed scheme can also be applied for coarse alignment in highspeed laser-based free space optical communication (FSO) systems with visible beacons. 10 Gb/s on-off keying (OOK) transmission is successfully demonstrated over a 1.8 m FSO link with the coarse alignment and the spatial light modulator (SLM)-based fine alignment. Experimental results indicate good flexibility and effectiveness of the proposed scheme for an FSO system with high spatial efficiency and low cabling complexity in data centres.

Conference Presentation

Citation Download Citation

Fulin Liu, Minan Chen, Weibin Jiang, Xianqing Jin, and Zhengyuan Xu "Effective auto-alignment and tracking of transceivers for visible-light communication in data centres", Proc. SPIE 10945, Broadband Access Communication Technologies XIII, 109450N (1 February 2019); https://doi.org/10.1117/12.2506955

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