To achieve multi-Gb/s data rates in 6G optical wireless access networks based on narrow infrared (IR) laser beams, a high-speed receiver with two key specifications is needed: a sufficiently large aperture to collect the required optical power and a wide field of view (FOV) to avoid strict alignment issues. This paper puts forward the systematic design and optimisation of multi-tier non-imaging angle diversity receivers (ADRs) composed of compound parabolic concentrators (CPCs) coupled with photodiode (PD) arrays for laser-based optical wireless communication (OWC) links. Design tradeoffs include the gain-FOV tradeoff for each receiver element and the area-bandwidth tradeoff for each PD array. The rate maximisation is formulated as a non-convex optimisation problem under the constraints on the minimum required FOV and the overall ADR dimensions to find optimum configuration of the receiver bandwidth and FOV, and a low-complexity optimal solution is proposed. The ADR performance is studied using computer simulations and insightful design guidelines are provided through various numerical examples. An efficient technique is also proposed to reduce the ADR dimensions based on CPC length truncation. It is shown that a compact ADR with a height of $\leq0.5$ cm and an effective area of $\leq0.5$ cm$^2$ reaches a data rate of $12$ Gb/s with a half-angle FOV of $30^\circ$ over a $3$ m link distance.
翻译:为了在基于窄红外(IR)激光束的6G光学无线接入网络中实现多-Gb/s数据率,需要一个具有两个关键规格的高速度接收器:一个足够大的孔径,收集所需的光电和广视场,以避免严格的对齐问题。本文件提出由复合抛物宽调控器(CPCs)组成的多层非成形角度多样性接收器(ADRs)的系统设计和优化,同时提供基于激光光学无线通信(OWC)链接的光管阵列(PD)$。设计交易包括每个接收器元素的增益-FOV交换和每个PD阵列的区域频宽宽度交换(FV),以避免严格的对齐问题。根据对最低要求的FOVD和ADR的全维度限制,建议找到接收器带带宽度和FOV2的优化配置,并提议一个低相容最佳解决方案。使用计算机模拟和直观设计准则,通过各种数字示例,提供一个高效的MADR平面数据。