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A phenomenal increase in voice, data and video communication has caused increase in the demand for more economical and larger capacity communication systems. This has caused a technical revolution in the electronic communication industry. Satellite systems provide only a temporary relief to the ever increasing demand.
Systems that use glass or fiber to contain a light wave and guide it from a source to a destination. Communication systems that carry information through a guided fiber cable are called “FIBER OPTIC SYSTEM”.
There are three primary building blocks of the link are
Transmitter
Fiber guide
Receiver
1. Transmitter:
The transmitter consists of an analog or digital interface, a voltage to current converter, a light source and a source-to-fiber interface.
(A). Analog or digital interface:
In transmitter the light source can be modulated by a digital or an analog signal.
For analog modulation, the input interface matches impedances and limits the input signal amplitude.
For digital modulation, if the input in digital there no modulation. If in analog form it must be converted to a digital pulse stream. For later case, an analog-to-digital converter must be including in interface.
(B). Voltage-to-current converter:
It serves as an electrical interface between the input circuitry and the light source. It converts input signal voltage to a current that is used to drive the light source.
(C). Light source:
The light source is either a light emitting diode (LED) or an injection laser diode (LED).
(D). the source to fiber interface:
Its function is to couple the light emitted by the source into the optical fiber cable.
Click here to download more information
Systems that use glass or fiber to contain a light wave and guide it from a source to a destination. Communication systems that carry information through a guided fiber cable are called “FIBER OPTIC SYSTEM”.
There are three primary building blocks of the link are
Transmitter
Fiber guide
Receiver
1. Transmitter:
The transmitter consists of an analog or digital interface, a voltage to current converter, a light source and a source-to-fiber interface.
(A). Analog or digital interface:
In transmitter the light source can be modulated by a digital or an analog signal.
For analog modulation, the input interface matches impedances and limits the input signal amplitude.
For digital modulation, if the input in digital there no modulation. If in analog form it must be converted to a digital pulse stream. For later case, an analog-to-digital converter must be including in interface.
(B). Voltage-to-current converter:
It serves as an electrical interface between the input circuitry and the light source. It converts input signal voltage to a current that is used to drive the light source.
(C). Light source:
The light source is either a light emitting diode (LED) or an injection laser diode (LED).
(D). the source to fiber interface:
Its function is to couple the light emitted by the source into the optical fiber cable.
Click here to download more information
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