IGNOU PHE 16 2018 - With the help of p-n junction band diagrams, distinguish between the l

Question

With the help of p-n junction band diagrams, distinguish between the light emission processes in LED and laser diode.

25 Jan 2018

Answer :

Word Count : 475

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.

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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

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