Oh Chin Wan, Cao Zizheng, Tangdiongga Eduward, Koonen Ton
Opt Express. 2016 Aug 22;24(17):19211-27. doi: 10.1364/OE.24.019211.
In order to circumvent radio spectrum congestion, we propose an innovative system which can provide multiple infrared optical wireless beams simultaneously where each beam supports multi-gigabit-per-second communication. Scalable two-dimensional beam steering by means of wavelength tuning is proposed. A passive beam-steering module constructed with cascaded reflection gratings is designed for simultaneous multi-user coverage. We experimentally characterized the beam-steered system and thoroughly evaluated the performance of steered channels using the spectrally efficient and robust discrete multitone modulation in a bandwidth-limited system deploying 10 GHz telecom transceivers. This study reports the achievement of at least 37 Gbps free-space transmission per beam over a distance of up to 2 m over 5.61° × 12.66° scanning angles.
为了规避无线电频谱拥塞，我们提出了一种创新系统，该系统能够同时提供多束红外光无线光束，且每束光束都支持每秒数吉比特的通信。我们提出了通过波长调谐实现的可扩展二维光束转向。设计了一种由级联反射光栅构成的无源光束转向模块，用于同时进行多用户覆盖。我们对光束转向系统进行了实验表征，并在部署了10 GHz电信收发器的带宽受限系统中，使用频谱高效且稳健的离散多音调制，全面评估了转向信道的性能。本研究报告了在5.61°×12.66°扫描角度范围内，每束光束在长达2米的距离上实现了至少37 Gbps的自由空间传输。
