Wide-field-of-view auto-coupling optical antenna system for high-speed bidirectional optical wireless communications in C band

Author:

Tian Jiahan,Guo TingbiaoORCID,He NanORCID,Du Ji,Hong XiaojianORCID,Fei ChaoORCID,Lin Zijian,Zhang Ranran,Huang Qiangsheng,Wang Yuan,Zhang Tianyi,He Sailing1ORCID

Affiliation:

1. Royal Institute of Technology

Abstract

Due to a great many superior features of infrared light communication (ILC), like high capacity and strong privacy, ILC is considered a potential candidate for serving the high demands of beyond fifth-generation/sixth-generation (B5G/6 G) communication systems. However, the terminal’s limited field-of-view (FOV) induces great difficulty in establishing line-of-sight (LoS) link between the transceiver and the terminal. In this paper, we propose a wide-FOV auto-coupling optical antenna system that utilizes a wide-FOV telecentric lens to collect incident infrared beams and automatically couple them into a specific single-mode-fiber (SMF) channel of fiber array and optical switch. The performance of this optical antenna system is assessed through simulation and manual alignment operation, and validated by automatic alignment results. A coupling loss of less than 10.6 dB within a FOV of 100° for both downstream and upstream beams in C band is demonstrated by the designed system. Furthermore, we establish a bidirectional optical wireless communications (OWC) system employing this antenna and a fiber-type modulating retro-reflector (MRR) system in the terminal. Both 10-Gbps on-off keying (OOK) downstream and upstream transmissions are successfully realized with the FOV of up to 100° in C band where the measured bit-error-rate (BER) is lower than 3.8 × 10−3. To the best of our knowledge, this is a brand-new auto-coupling optical antenna system with the largest FOV in ILC automatic alignment works in terminals that have ever been reported.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

Natural Science Foundation of Ningbo

Ningbo Science and Technology Project

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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