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So what is RF-over-Fiber technology ?
RF over optical fiber is small in size, flexible, very low loss technology using intensity modulation to transmit RF signals. The continued fall in the cost of electro-optical conversion over recent years has led to RF over Fiber being increasingly adopted for applications such as linking satellite teleports to control rooms, live outside broadcast TV, and enhancing coverage of wireless technologies such as GPS, GSM, WiMax, Tetra and P25 for example by linking remote antennas inside buildings, tunnels and mines.
There are numerous benefits of using optical fiber based solutions such as:- It offers a number of inherent advantages over the use of coaxial cables or free-space transmission, including:
The system is defined in terms of normal RF parameters, i.e. gain, noise figure, linearity etc., and can be treated as an RF black box by a systems designer.
ViaLite systems use intensity modulation, which is amplitude modulation in the optical domain. The RF signal applied by the user to the optical transmitter directly modulates the intensity of a light source (e.g. a laser diode).
No frequency conversion or analog-to-digital conversion is involved.
This technique results in the widest possible frequency response and highest possible dynamic range. At the optical receiver, the modulated light is converted back into an RF signal using a high frequency photodiode.
Intensity modulation places very demanding requirements on all components in the optical path - particularly the laser diode. In ViaLite products, these components have been designed for optimum efficiency, noise and linearity performance.
For a more detailed explanation of the modulation please see our Electro-optical conversion process page.
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