Electro-optic properties of a cross-linked second order nonlinear optical polymer were reported. This polymer was
synthesized via the crosslinking reaction with cross linker Trimethylolmelamine by doping the chromophores into the
cellulose diacetate system. The crosslinking temperature is 144°C. The electro-optic coefficient was measured to be 7.12
pm/v at 1550 nm after poling. The stability characteristic of electro-optic effects was studied by a combination of the
electro-optic coefficient and dielectric relaxation measurements. Results show that the cross-linked electro-optic polymer
system possesses an excellent long-time stability. The average relaxation time is as large as 5880 days and the relaxation
was modeled by KWW equation. The dielectric analyses show that the temperature dependence of the relaxation time
follows Arrhenius law.
A time-domain optical add-drop multiplexing (OADM) technology using microring resonators is reported. Design and simulation are presented. The microring resonator is predicted to be fabricated by using Pockler electro-optic materials. The microring resonators possess a multistage-cascaded structure to satisfy the requirement to generate switching windows. Cascaded coupled microring resonator can expand the single resonant point into a box-like resonant region and reduce the wings of resonant curve. While multistage resonators are used and a certain shift of the resonant region is arranged between the stages, the total resonant region can be expanded further. We achieve the shift of the resonant region between the two stages by selecting different ring radii. The resulted microring resonators possess a box-like characteristic with shape wings. The OADM includes two microring resonators (MMRs) driven by sine wave voltages, one is used to accomplish the add function the other is used to accomplish the drop function. The only operation differences between the two MMRs are the bias voltage and the phase of the driving signal. The OADM only requires electrical control signal and simple structure instead of high-quality optical control pulse and interferometer structure. FDTD simulation results show that the resonators can stratify the requirements to generate complementary switching windows for OADM operation.