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The impact of fiber optic transmission in multiservices networks in rwanda

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par Théogène NIYITEGEKA
National university of Rwanda - Bachelor's degree in electronics and communication system engineering  2011
  

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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]

Z0 = R+j~

G+jw

(2.1)

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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