In this paper, a series of PMMA-containing sol-gel hybrid films has been prepared and used with the DAST single crystal grown to form a sandwiched NLO material. The prepared NLO material was used to fabricate an optical polarizer device. The optical polarization properties of the NLO material were measured between 1520 nm and 1560 nm, the DWDM transmission window. The result shows that the optical polarizer has good polarization property and can be used as a variable optical attenuator in the window of the DWDM transmission system.
A broadband (1530 to 1565 nm) waveguide polarizer is fabricated by utilizing the growth birefringence organic crystal at control temperature and hybrid with an organophosphazene contained sol-gel SiO2-PMMA IPN polymers. The polarizer consists of the fiber optic waveguide supporting different polarizer mode, which is design with optic active film in the middle of the passive component waveguide. It has a fiber-in-line structure and requires no high temperature process like poling. The measured polarization extinction ratio is about 12 dB at the wavelengths from 1520 to 1570 nm, and the estimated insertion loss is less 3 dB.
A nearly perfect single crystal DAST thin film has been grown in this study. The polarized optic microscopy photograph demonstrated an ordered morphology for the surface of this thin film. The FTIR spectrum shoed that the intensities of the characteristic absorption bands for the single crystal thin film were different from that for the crystalline thin film. With 3D luminance image analysis, it was found that the intensity of a guided laser light passing through the single crystal thin film along its a-axis is a little bit stronger than that guided along a standard 8.5/125 μm silica optic fiber. The diameter of the guided light and the space between the two guided lights estimated were about 25 μm and 65 μm, respectively. This study indicates that only the single crystal thin film can be used as a waveguide without further process and is a promising candidate for electro-optic modulators and other active optical devices.
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