Basic Study on Receiving Light Signal by LED for Bidirectional Visible Light Communications

Abstract

Recently the light emitting diodes (LED) have been used for lighting and illumination because of their features such as low power consumption and long life. The lighting equipments have only LED. Therefore, it is necessary to install photo detector to enable bidirectional communication. In this paper, we propose a receiving light signal by LED for bidirectional visible light communications. We evaluate the characteristics of LED used as a photo detector for bidirectional visible light communications through experiment. And, we describe the developed experimental system that uses LED as a photo detector. We show that we can use LED as not only light source but also photo detector for bidirectional visible light communications through experiment.