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Introduction to Fibre Optics


The use of optical fibres is the professional solution to solve the problem of the distribution of the TV signal over wide areas.

More and more often we find situations in which we need to distribute the TV signal in wider areas like, for example, shopping centres, stadiums or residencial resources.
As distances covered by TV distribution networks increase, we start facing limitations due to the use of coaxial cable in long TV links: "higher attenuations that lead to the use of several cascaded amplification stages that will degrade the quality of the signal" (reduction of C/N).
The problem is even worse when you must distribute other TV bands than the terrestrial like, for example, satellite signals.
n this case, the high operating


frequency (950 – 2150 MHz) of the satellite IF can be a source of serious problems for the installer.
A possible solution to this situation comes from the use of optical fibre, which is a waveguide made of glass material, capable to transport the light inside. Introduction to Fibre Optics
By means of the optical fibre we are able to transmit information, in our case television signal, in the form of light impulses and not more as electric signals, thus obtaining many advantages like transporting signals in the band between 5~2150 MHz to distances that can reach 25 Km with an attenuation about 0,3 dB/Km in all frequencies, avoiding the necessity of an equalizer.
Thanks to their small dimensions (the typical diameter of the fibre cable with 4 fibers is about 5mm) it is easy to pass the cable through conduits even though the space was very narrow,...etc.
Let's summarize its advantages:
  Minimum losses. Long distances can be covered and wide networks can be deployed


without line amplification.
Full compatibility with digital technology.
  Big bandwidth.
  Lightweight and small diameter.
  Abundance of silicon, the basic raw material to produce it.
And besides, like the coaxial cable, is safe and healthy:
  Offering immunity against noise and/or electromagnetic interferences.
  Making intrusions really difficult.
  Avoiding signal radiations to the environement.
In contrast, it demands a delicate handling as it is more fragile than coaxial cable, and any connectorization or splicing operation requires accuracy and neatness.
Taking into account the present context, Televes, world leader in the production of equipments and software for the reception and distribution of TV signals has developped a complete range of products for Fibre Optics. 

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