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Cascaded X sub ((2)) Wavelength Converter in LiNbO sub 3 Waveguides with Counter-propagating Beams

08 July 1999

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We report a wide-band wavelength converter based on a cascaded second-order nonlinearity in periodically-poled LiNbO sub 3 waveguides pumped at 1.5 microns. The converter uses counter-propagating beams in order to improve conversion efficiency and pump rejection. We show an internal conversion efficiency of -10 dB and a conversion bandwidth of 68 nm in a 4 cm long device.