Semestre 2

During the development of telecommunication devices, it quickly became necessary to code the information to be transmitted, either to adapt the information to the transmission channel or to simultaneously transmit several signals on the same channel. This process is known as modulation and the device that performs this operation is called modulator. Many methods were presented to achieve these modulations such as: Electro-optic effect, Acousto-optic effect and Magneto-optic effect. In this manuscript, we treat the two first effects based on the interaction of light with electrical field and acoustic wave respectively.
For better presenting these two effects, we start by studying the light propagation in anisotropic medium which is primordial to explain the electro-optic effect. After that, we study the modulated electrical signal which is used to generate ultrasound which in turn participates to create the acousto-optic effect.