4 April 2005 Fast VOA employing electro-optically clad silica waveguide
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A variable optical attenuator employing an electrooptic Kerr material as the functional cladding of a silica waveguide is shown to switch in less than 1 microsecond with an extinction ratio greater than 15 dB. The VOA is designed to operate at 70 C and the electrooptic material has a refractive index that is less than the silica waveguide at that temperature. Methods for achieving low polarization dependent loss are outlined. An electrooptically-induced half-wave plate is shown to provide polarization independent performance with polarization dependent loss less than 0.6 dB at 19 dB of attenuation.
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Richard Ridgway, Steven Risser, David Nippa, Richard Higgins, Vincent McGinniss, "Fast VOA employing electro-optically clad silica waveguide", Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.592718; https://doi.org/10.1117/12.592718

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