Optical sources

It must be possible to operate the device continuously at a variety of temperatures for many years. Read more

Properties of light :
Light is electromagnetic radiation that has wave properties. Light waves can travel in a straight line. Read more

LED :


What is LED?
Light emitting diode (LED) is a component its convert the electrical signal into a corresponding light that is injected into the fiber. Read more

LED structure :
Light emitting diode (LED) is a component its convert the electrical signal into a corresponding light that is injected into the fiber. Read more

1. The linear relationship between optical output and current.  2. Spectral width is 25 to 40 nm or lambda = 0.8 - 0.9 ┬Ám. Read more

Light source materials :
The spontaneous emission due to carrier recombination called carrier recombination electroluminescence. Read more

LED types :
1. Gallium Arsenide (GaAs) - infra-red, 2. Gallium Arsenide photo-side (GAAsP) - red to inferred, orange. Read more 

LED colors :
1. Red, 2. infrared, 3. Blue, 4. Orange Read more 

Advantages and disadvantages of LED :
Advantages: 1.Simpler fabrication  2. Simple drive circuitry
Disadvantages: 1. Incoherent light source. 2. Little effective in the wide area Read more

Application of LED :
1. Automotive, 2. Mobile devices 3. Back-lighting and projection etc. Read more 

Laser diode :

What is LD?
The laser is a device which amplifies the light, hence the LASER is an acronym for light amplification by stimulated emission of radiation. Read more

Power current characteristics of LD :
To show in the figure the output optic power versus forwarding input current characteristics is plotted in a figure for a typical laser diode. Read more

Optical characteristics of LD :
The output of the LASER depends on the drive current passing through it. In LASER diode operate as an inefficient LED, when driving current crosses threshold value, lasing action begins. Read more 

Types of laser :
Single-mode lasers are preferred for high-speed long-distance communications. The single mode lasers contain only a (single longitudinal mode and a single transverse mode. Read more
This article is very useful to know or learn about how to find different types of efficiency in the laser diode. Read more

Advantages and disadvantages of LD
Advantages: 1. Simple economic design 2. Better modulation capability
Disadvantages: 1. It produces more divergent laser beam 2. Expensive Read more

Applications of injection layer :
An injection laser is also known as a laser diode or diode laser. It is a semiconductor device, nowadays it can be used optical fiber, compact disk, remote control device etc. Read more