10 June 2004 An adaptive optical filter based on thermo-optic (TO) polymeric waveguide lattice filters
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An adaptive optical filter based on novel thermo-optic polymeric waveguide lattice filters is proposed. Unlike conventional interference or resonance based optical filter, the adaptive filter is based on thermo-optic two-port waveguide lattice filters, which can greatly reduce the size, complexity and considerably increase the tuning range of an optical filter. By employing integrated variable optical attenuators (VOA), which functioned as the dynamically reconfigurable filter coefficients, the profile of the filter can be dynamically controlled. The classical frequency sampling and step down recursion algorithms are used for the synthesis of the VOA filter coefficients. Simulation and preliminary experimental results show that a tuning range of 50nm can be realized with filter extinction ration of ~40dB. The larger tunaing range comes from the larger by thermo-optic (TO) coefficients of polymer materials. Since it is based on polymeric waveguides, this device can be easily integrated with other polymer waveguide devices such as optical switches, EO modulators, and thus form a building block for photonic intergrated circuits.
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Xuejun Lu, Xuejun Lu, } "An adaptive optical filter based on thermo-optic (TO) polymeric waveguide lattice filters", Proc. SPIE 5358, Photonics Packaging and Integration IV, (10 June 2004); doi: 10.1117/12.543941; https://doi.org/10.1117/12.543941


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