4d29Optical Fibers

7/28/2019 4d29Optical Fibers

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OPTICAL FIBERS


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Agenda:

Introduction

Working

Types Applications

Advantages

Disadvantages References


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Introduction:

Optical fibers arelong, thin strands ofvery pure glass

usually 120 m indiameter. They arearranged in bundlescalled optical cables

and used to transmitlight signals over longdistances.


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Parts of Optical Fiber

Core thin glass center of the fiber wherelight travels.

Cladding outer optical materialsurrounding the core.

Buffer Coating plastic

coating that protectsthe fiber.


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Transmission of Light ThroughOptical Fibers

Total Internal Reflection


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Total Internal Reflection

The angle of the lightis always greater thanthe critical angle.

Cladding does notabsorb any light fromthe core.

The extent that the

signal degradesdepends upon thepurity of the glass andthe wavelength of thetransmitted light.


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Fiber Optics Systems has

Optical Receiver

Optical Regenerator

Optical Fiber

Transmitter


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Types of Optical Fibers

Optical fibers come in two types:

Single-mode fibers

Multi-mode fibers


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Single-mode fibers

Single-mode fibersare used to transmitone signal per fiber

(used in telephoneand cable TV). Theyhave small core (9microns in diameter)

and transmit infra-redlight from laser.


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Multi-mode fibers

Multi-mode fibers areused to transmitmany signals per fiber

(used in computernetworks). They havelarger cores (62.5microns in diameter)

and transmit infra-redlight from LED.


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Wavelength Division

Multiplexing Signals with different

wavelengths are

combined, transmittedtogether, and separatedagain.


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Time Division Multiplexing

Several optical signals are

combined, transmitted

together, and separated again

based on different arrival

times.


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Applications

Carry plain old telephone service (POTS)

For transmission of data

Transmitting broadband signals In the biomedical industry

Non-Communication Applications

(sensors etc)


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Advantages

Less Expensive

Thinner

High Carrying Capacity

Less Signal Degradation

Light Signals

Low Power

Digital signals

Light Weight


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Disadvantages

Fiber optics are that the cables areexpensive to install.

The termination of a fiber optic cable iscomplex and requires special tools.

They are more fragile than coaxial cable.


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References

1. http://www.authorstream.com/

2. http://www.howstuffworks.com/

3. http://www.wikipedia.com/

4. http://www.osun.com/

Thank you
http://www.authorstream.com/http://www.howstuffworks.com/http://www.wikipedia.com/http://www.osun.com/http://www.osun.com/http://www.wikipedia.com/http://www.howstuffworks.com/http://www.authorstream.com/

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