Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
Fibre optic communication system
An optical fibre communication System (Block diagram) consists of three important parts viz., (i) Transmitter (ii) Optical fibre (iii) Receiver.
FIBRE OPTIC
COMMUNICATION SYSTEM
An
optical fibre communication System (Block diagram) consists of three important
parts viz., (i) Transmitter (ii) Optical fibre (iii) Receiver as shown in
Fig.9.7.
a) Information signal
source: The information signal source, may be
voice, music, video signals etc. which is in the analog form to be transmitted
is converted from Analog signal to electrical signal.
b) Transmitter:
The transmitter consists of a drive circuit and a light source. The drive
circuit transfers the electric input signal into digital pulses and the light
source converts that into optical pulses. The light source usually used is LED.
Here the electric pulses modulate the intensity of the light source (Laser (or)
LED) and are focussed onto the optical fibre.
c) Optical fibre:
It acts as a waveguide and transmits the optical pulses towards the receiver,
by the principle of total internal reflection.
d) Receiver:
The photo detector is a receiver which receives the optical pulses and converts
it into electrical pulses. Further the signals are amplified by an amplifier.
These electrical signals are decoded (i.e.) converted from digital to Analog
signals. Thus the original electrical signal is obtained, in analog form, with
the same information.
In
this way, information is transmitted from one end to other end.
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics : Tag: Applied Physics : - Fibre optic communication system
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
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