Informative and easy to understand demonstration on how RF signals can be transmitted over single-mode fiber. In this demonstration, Shmulik Cohen, Satellite Product Manager at Global Foxcom hooks up a satellite dish to a spectrum analyzer using a 5km drum of single-mode fiber cable.
Informative and easy to understand demonstration on how L-Band signals can be transmitted over Km single-mode fiber. The system does DWDM multiplexing over a single fiber. The transmit path up to the satellite uses a modulator to take the digitised TV camera data and modulate it onto a carrier signal. This is the same process as any radio transmission. Once modulated your data is hitching a ride on the carrier signal, this signal is transmitted to the satellite and back to earth again.
At the destination antenna, your signal is then received at a demodulator. The demodulator works just as any radio receiver, the TV data is separated from the carrier signal and this is called demodulated. The data can then be fed into a TV once converted to the appropriate format and watched. This principle is the same for any modulator and demodulator. These two quite separate devices are usually packaged together to make a Modem. They can however, be used on their own, for example, just like your home Satellite TV receiver.
This is usually a demodulator only and separates the TV data from the carrier signal for you to watch on your TV. So what is QPSK? This is acheived by using a sine wave which is phased shifted delayed by 90 degrees, degrees and degrees.
With 0 degrees being state 1, 90 degrees being state 2 and so on. The diagram above shows 4 ellipses one in each quadrant. These vary in shape with the data that is modulated onto each phase. Each course has a link to the next so that you can work through without having to keep going back to the index. Tutorials - Course 1 - Principles The basic principles of satellite communications. Tutorials - Course 2 - Components A look at the component parts of satellite communications.
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