ABSTRACT
This chapter gives an overview of organic-based visible light communications (VLC) focusing on the light-emitting diodes (LEDs) technology trends, organic LED (OLED)-based devices, the organic semiconductors, and visible light photo detectors (PDs). The idea of organic photonics for communications had been conceived previously and the first postulation of organic photonic devices for optical fiber communications was in 1992. The receiver in VLC systems is generally an individual positive-intrinsic negative (PIN) silicon (Si) PD, or less commonly, a Si avalanche PD. Equalizers can undo the effects of inter symbol interference (ISI) mostly caused by multipath and limited channel transmission bandwidth. Digital equalizers can be separated into linear and nonlinear methods. The major difference between artificial neural network (ANN) and transversal equalizers is the structure; the former are arranged into a highly parallel form that allows nonlinear mapping as each input is connected to each neuron.
