Over long distances and for high-density transmission, the optical fibre (OF) has proved to be the ideal solution, both now and for the future.
The management of such a flow of information is hardly a straightforward matter. It is the role of optical transmission systems to solve this problem.
The 3 vital functions of optical transmission systems are:
- Conversion of the electrical signals into optical signals and vice-versa.
- Modification of the signals according to the conditions of application (electrical interfacing), with or without A/D or D/A conversion.
- Multiplexing time-based or frequency-based, to allow the juxtaposition - depending on the time or frequency range - of a number of signals on the same optical channel.
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