Bidirectional mid-infrared communications between two identical macroscopic graphene fibres

Among light-based free-space communication platforms, mid-infrared (MIR) light pertains to important applications in biomedical engineering, environmental monitoring, and remote sensing systems. Integrating MIR generation and reception in a network using two identical devices is vital for the miniaturization and simplification of MIR communications. However, conventional MIR emitters and receivers are not bidirectional due to intrinsic limitations of low performance and often require cryogenic cooling. Here, we demonstrate that macroscopic graphene fibres (GFs) assembled from weakly-coupled graphene layers allow room-temperature MIR detection and emission with megahertz modulation frequencies due to the persistence of photo-thermoelectric effect in millimeter-length and the ability to rapidly modulate gray-body radiation. Based on the dual-functionality of GFs, we set up a system that conducts bidirectional data transmission by switching modes between two identical GFs. The room-temperature operation of our systems and the potential to produce GFs on industrial textile-scale offer opportunities for simplified and wearable optical communications.

Applied Technology in Design and Implementation of Infrared Communication Module

Infrared communication technology is a short-range wireless communications technology widely adopted in the world today range .This paper detailedly introduces the basic principles of infrared protocol. Infrared communications applications of this paper is to achieve system applications of infrared communication between two development boxes with an infrared transceiver modules.The program consists of PC program and lower computer program two parts,also are called infrared communication basic procedures and infrared communication console program.Running PC program on a PC,running lower computer program on the development box.Based on Borch-company's S3C2410-S ARM9, experimental development box implements a infrared communications infrastructure lower computer program based on serial meeting SIR standards.By calling the Qt graphics library,using the programming language C++,it achieves a visual infrared communication console PC program under linux system.

Infrared Communication Technology Applied to Indoor Mobile Healthcare Monitoring System

In the context of healthcare monitoring, it is necessary to transmit vital information from the patient to an interface managed by the hospital staff. In this paper, the authors consider a system in which a patient can move within a hospital room and the data collected by sensors are transmitted to a distant receiver placed on the ceiling. The authors investigate the potentiality of using infrared communications for the transmission of information in this mobile context, by considering the simplest modulation scheme based on On-Off Keying (OOK) technique. In order to represent patient mobility in the room, the authors use a model for the patient location based on a Gaussian distribution over the three axes of mobility in the room. In addition, they consider different scenarios, considering either a Line Of Sight (LOS) configuration or a diffuse one. From the obtained results, the authors can determine by evaluating the transmission probability of outage, the potentiality of this technology to ensure the communication between sensors and the collecting point.