Narrow Results

In order to utilize the large electro-optic coefficient of organic ionic crystal, 4-(4-dimethylaminostyryl)-1-methylpyridinium tosylate (DAST), a photobleaching technique was used for serially grafted DAST crystal waveguide fabrication. To fabricate a low optical loss crystal waveguide, a single-mode serially grafted DAST waveguide model with taper structure has been designed and simulated by beam propagation method (BPM). For the single-mode serially grafted crystal waveguide fabrication, we developed a novel single thin crystal growth method successfully. An attempt for the waveguide fabrication has been carried out. A feasible method for the single-mode crystal waveguide fabrication was proposed.

Push-pull electro-optic polymeric Mach-Zehnder modulators with photo-bleaching induced waveguides and dual-driving electrodes operating at 1.55 μm wavelength have been demonstrated. The nonlinear electro-optic polymer used in this work was based on a phenyltetraene bridged chromophore in polycarbonate, APC-CLD1. It has been shown that the predominant photo-bleaching mechanism was a photochemical decomposition of the chromophore. The half-wave voltage of the integrated polymeric modulator was 4.5 V in a push-pull configuration with a 1.5 cm interaction length. The extinction ratio was greater than 20 dB, and the fiber-to-fiber insertion loss was 8 dB for the TM polarization at 1.55 μm wavelength.