Article | REF: E3331 V1

Microwave optoelectronics - Modulation, links and switching

Authors: Béatrice CABON, Jean CHAZELAS, Daniel DOLFI

Publication date: November 10, 2003

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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