1. Optical modulation
Transmitting electrical information (signals) by optical means requires electrical/optical transducers at the transmitting end and inverse optical/electrical transducers at the receiving end, to restore the signal. The first electrical/optical conversion operation is called optical modulation. In effect, the signal is transported on the optical carrier, and this is accompanied by a spectral transposition, which we will now examine.
The advantage of semiconductor laser diodes (cf. § 2.1) for telecommunications or radar applications is that they can be easily modulated:
the optical intensity emitted at the laser output is modulated by an external modulator;
or more simply, the current flowing through the laser is modulated, resulting in a modulation of light in optical...
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Optical modulation
- (1) - Special Issue on Applications of Lightwave Technology to Microwave Devices, Circuits and Systems (Numéro spécial sur les applications de la technologie optoélectronique aux dispositifs, circuits et systèmes micro-ondes). - IEEE Transactions on Microwave Theory and Techniques (Institute of Electrical and Electronics Engineers), vol. 38, n° 5, p. 467-688, mai 1990....
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