CHAPTER TWO: FIBER OPTIC TRANSMISSION
2.1 GENERAL INFORMATION ON THE TRANSMISSION MEDIA
A transmission media are the physical pathways that connect one
point to another point. We will discuss about two different ways of
transmission which are:
> Guide media (copper and fiber optic medium)
> Unguided media (microwave links, satellite links)
It relates also primarily to the explanation of various
alternatives of these transmission resources, some common characteristics gives
us an outline on the choice of optical fiber. [2]
2.1.1 COMMON CHARACTERISTICS
2.1.1.1 Bandwidth
Bandwidth is the amount of data that can be transmitted along a
channel during a specified period of time. In most cases it is measured in bits
per second (bps).
2.1.1.2 Impedance characteristics
The characteristic impedance, Z0, of a line is the input
impedance of an infinite length of the line.[3]
Where:
R is the resistance per unit length,
L is the inductance per unit length,
G is the conductance of the dielectric per unit length, C is the
capacitance per unit length,
j is the imaginary unit, and w is the angular frequency
2.1.1.3 Coefficient of velocity
The coefficient of velocity is a size which measures the
propagation velocity of the signal in a media. It is also the relationship
between the propagation velocity real and the speed of the light
(c=3.108m/s).
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