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optical fiber

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by

Sagar Jaiswal

on 21 January 2012

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Transcript of optical fiber

OPTICAL FIBER

Introduction
Optical fibers are long, thin strands of very pure glass usually 120 µm in diameter. They are arranged in bundles called optical cables and used to transmit light signals over long distances.
Parts of Optical Fiber
Core – thin glass center of the fiber where light travels.
Cladding – outer optical material surrounding the core.
Buffer Coating – plastic coating that protects the fiber.
So HOW Does it work?
What is the Principle of Optical Fiber?
it works on the principle of

TOTAL INTERNAL REFLECTION
The angle of the light is always greater than the critical angle.

Cladding does not absorb any light from the core.

The extent that the signal degrades depends upon the purity of the glass and the wavelength of the transmitted light.
TYPES OF OPTICAL FIBER CABLES
SINGLE MODE
MULTI MODE
1) SINGLE MODE OPTICAL FIBER
Single-mode fibers are used to transmit one signal per fiber (used in telephone and cable TV).

They have small core (9 microns in diameter) and transmit infra-red light from laser.
2)MULTI-MODE OPTICAL FIBER
Multi-mode fibers are used to transmit many signals per fiber (used in computer networks).

They have larger cores (62.5 microns in diameter) and transmit infra-red light from LED.
Now as we have seen what is an OPTICAL FIBER.....
....lets see its
APPLICATIONS.
..
a) For transmission of data...
b) In the biomedical industry
c) In Sensors
Let us now have a look at the ADVANTAGES of Optical Fiber
First
they are
LESS EXPENSIVE
Second...
They are
THINNER
than any other cable wires...
third..
HIGH CARRYING CAPACITY
fourth..
LOW POWER CONSUMTION
fifth...
LESS SIGNAL DEGRADATION
now let us have a look on the
MAIN DISADVANTAGE
of
Optical Fiber

END TERMINATION
,
which is very costly, and needs highly experienced professionals
...AND.....
LIGHTNING
and
DECORATIONS
PRESENTATION done by...
SAGAR R. JAISWAL
11-562,
ECE,
CBIT, Hyderabad, A.P., India.

THANK YOU
By: Sagar R Jaiswal
Full transcript