In a microwave photonic link, if the amplitude modulation occurs in the laser (direct modulation) or in a Mach-Zehnder or electro-absorption modulator (external modulation) biased at Vπ/2, as long as the modulation index is low, this modulation results in two sidebands around the optical carrier. If the optical angular frequency is ωopt and the RF angular frequency is ωRF, the electric field of the modulated wave is expressed:
The Fourier transform of such a signal is constituted of three Dirac lines in the frequency space. E is obtained from its complex notation E1 by expression:
After having developed the functions of [6.1] in exponential sums, expression of E1 is given by expression:
Figure 6.2 illustrates the cross-section of a single-mode fiber where the fiber core ...