With the help of p-n junction band diagrams, distinguish between the light emission processes in LED and laser diode.
A p-n junction consists of two semiconductor regions with opposite doping type as shown in Figure 4.2.1. The region on the left is p-type with an acceptor density Na, while the region on the right is n-type with a donor density Nd. The dopants are assumed to be shallow, so that the electron (hole) density in the n-type (p-type) region is approximately equal to the donor (acceptor) density.
As the wide application of fiber optic system, optical light source plays a more and more important part in it. We known a basic optical fiber system consists of a transmitter, an optical fiber and a receiver. The fiber optic light source, as an important component of the transmitter is modulated by a suitable drive circuit in accordance with the signals to be transmitted. Optical light source is also needed for performing fiber optic network testing to measure the fiber optic loss in the cable plant. Light source is offered in a variety of types including LED, halogen and laser. Among which, LED and Laser light source are two types of semiconductor light sources. The following
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