## 1 Introduction  
Organic conjugated polymers were thoroughly investigated in recent years due to their interesting and peculiar physical properties, granted by electron delocalization of the \(\pi\)-bonds. Moreover, the extraordinary physical properties shown by organics can be easily tuned by appropriate synthesis processes [1, 2], providing a beneficial stimulus for applied research. In the last few decades, in particular, a great deal of effort was made to study the optical and electronic properties of organic copolymers. Electrical conductivity, nonlinear optical response, luminescence and electro-luminescencein this class of materials were studied extensively. These studies culminated in the Nobel Prize awarded in 2000 to [PERSON], [PERSON] and [PERSON] for their discoveries on conjugated polymers that allowed to extend the results obtained in the field of inorganic semiconductor electronics and photonics to the field of organics. Nowadays, organic materials have emerged from academic research to become useful building blocks of integrated optical devices for light emission, modulation and switching [3, 4]. The large-scale introduction of optical technologies in communication networks has become a reality with an enormous impact on the bandwidth and quality of communication services offered, on the economy of the industrialized countries and also on interpersonal and social relations. Fiber optics has enabled high bit-rate transmission capacity in the core network. Broad-band access, however, is limited because of the high costs of the hardware needed for distributing, routing and switching and eventually generation and detection of the optical signals. Guided by the situation in the field of electronics, the solution should be found in large-scale integration of optical functions in compact optical circuitries. The conversion of source data that are mainly in the electrical domain to optical bits and the dynamical functionality in optical networks require electro-optic or other active optical materials. Hybrid integration of passive wave-guiding structures with these active materials is a route to low-cost, high-performance modules. In this context, progress in organic materials demonstrates the excellent electro-optic properties and versatility for technological applications, for example a polymeric electro-optic modulation, based on a Mach-Zehnder integrated interferometer (MZI) operating at over 200 GHz was demonstrated [5] or electro-optic modulators based on microring resonator design [6, 7]. Among other advantages of organic materials, we can point out the compatibility with a variety of substrates, such as Si, GaAs, or plastics (a high-performance electro-optic polymer modulator on a flexible substrate was fabricated [8]), the ability to be efficiently integrated with very large scale integration (VLSI) semiconductor electronic circuitry, and the low-cost fabrication techniques. There are critical points that need improvement and are currently under study. Photo and thermal stability of the polymers increased with the synthesis of cross-linkable polymers [9, 10] and high glass transition temperature (High-Tg) polymers [11]. Optical losses at the telecommunication wavelength of 1.3 \(\upmu\)m and 1.55 \(\upmu\)m due to absorption by carbon-hydrogen (C-H) vibrational overtones (typically exceeding 0.5 dB/cm at 1,300 nm and 1 dB/cm at 1,550 nm) was reduced to 0.1 dB/cm by substitution of the hydrogen with heavier halogens like fluorine that has the effect of shifting the overtone peaks to longer wavelengths [2, 12]. Here we show a review of the characterization technique used in order to retrieve the magnitude and the thermostability of the electro-optic properties of different species of fluorinated and non-fluorinated polymers.