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Microwaves Photonic Links: Components and Circuits by Anne-Laure Billabert, Catherine Algani, Christian Rumelhard

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Chapter 6

Complement to Microwave Photonic Link Performances

6.1. Microwave signal attenuation during double sideband modulation

6.1.1. Double sideband modulation recall

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:

[6.1Equation 6.1

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:

[6.2] Equation 6.2

After having developed the functions of [6.1] in exponential sums, expression of E1 is given by expression:

[6.3Equation 6.3

Figure 6.1. Optical carrier amplitude modulated by a RF

Figure 6.1

6.1.2. Recall of single-mode optical fiber propagation characteristics

Figure 6.2 illustrates the cross-section of a single-mode fiber where the fiber core ...

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