About FOCL And Analog Transmission Prt.2

How FOCL Works

The fiber-optics is a technology, in which light is used as a data medium and it doesn’t matter what kind of information it is: analog or digital one. The infra-light is used in it, and the communication environment is a fiberglass.

Fiber-optic facilities can be used for different types analog or digital signals transmitting.

In the most simple form the fiber-optic line consists of three components:

– fiber-optic transmitter is for incoming electrical signal from a source to modulated light conversion

– fiber-optic line, which broadcast signals to the receiver

– fiber-optic receiver, which converse signals into electrical (almost identical to the source signal)

The source of fiber-optic inside light is LED (or LD). A special receiving detector one the opposite end of cable converses light signals into electrical.

The fiber-oprics is based on a special effect – deflection with maximum angle of incidence, when a pure reflection takes place. This effect appears when a ray of light comes out from a dense medium and gets into a less dense medium in a defined angle. Inner conductor of a fiber optic cable has a higher refractive index than the cable sheath. This way the ray of light, that coming through the inner conductor, can’t gets out of the conductor because of the pure reflection effect (pic.1). As a result, a transmitted signal moves inside of a closed environment and travels form a transmitter to a receiver.

Pic.1 Pure reflection effect

Others components of the cable protect the brittle fiber from a damage that hostile environment can bring.