In this paper, we present a detailed analysis about the electro-optic (EO) polymer modulators using a full vectorial finite
difference (FVFD) mode solver for an optical waveguide and a finite-element method (FEM) for a microwave electrode.
A detailed discussion has been presented to describe a modulator about performance parameters: <i>V<sub>π</sub>L, ΔfL </i>with the design parameters, where <i>V<sub>π</sub>L</i> is the product of the half-wave voltage <i>V<sub>π</sub></i> and the electrode interaction length <i>L, </i>the parameter <i>ΔfL</i> is the product of the 3 dB optical bandwidth <i>Δf</i> and the electrode interaction length<i> L</i>.
Base on the same two monomers, diphenolic acid (DPA) and isophthaloyl chloride (IPC), three chromophore-containing
nonlinear optical (NLO) polyarylate polymers were prepared. A tricyanofuran (TCF)-acceptor type chromophore group
was in main-chain (mPAR-chr1), side-chain (sPAR-chr1) and side-chain with a 1,1-bis(4-hydroxyphenyl)-1-phenyl-2,2,2-trifluoroethane (BPAPF) group (sPAR-F-chr1), respectively. The obtained polymers were characterized and evaluated by UV-Vis, <sup>1</sup>H NMR, DSC and TGA. All the polymers exhibited good electro-optic (EO) activity. The relationship between EO coefficients (r<sub>33</sub>) and the chromophore concentration of the three polymers were also characterized and discussed. There were no obvious differences found in EO activity between mPAR-chr1 and sPAR-chr1 polyarylates with the same chromophore. The fluorinated block polyarylate sPAR-F-chr1 has the largest r<sub>33</sub> value in these three polyarylates which is 52 pm/V at the wavelength of 1310 nm (which is almost twice the r<sub>33</sub> value of normal polymers contained the same chormophore at the same content), when the concentration of chromophore 1 is 18wt.%. 85% of the r<sub>33</sub> value was retained in the sPAR-F-chr1 after being heated at 85°C for 600 hours. The polymer sPAR-F-chr1, with good solubility, high T<sub>g</sub> (above 200 °C) and side functional group at the same time, may probably be a practical NLO material. These properties make the new polyarylates have potential applications in EO devices such as EO modulators and switches.
Organic electro-optic polymer has low dielectric constant and high electro-optic coefficient, which is one of the perfect
materials for making modulators with low loss and high bandwidth. In this paper, we synthesized a novel chromophore
based on the 4-(diethylamino) salicylaldehyde electron donor and the rigid isolated benzyl group. Based on the
innovative chormophore, we designed low loss Mach-Zehnder interference modulators with 3dB bandwidth 50GHz
using tapered waveguides and coplanar waveguide electrodes as well as micro-strip electrodes. Performance parameters
of the modulators were detailed analyzed and two microwave driven electrodes were compared.