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We numerically investigate the performance of wavelength shifters in quasi-phase-matched channel waveguides in lithium niobate. The shifters are based on cascaded quadratic processes, namely, sum- and difference-frequency generation, and permit efficient conversion and signal gain near 1.55 µm over the full bandwidth of erbium-doped fiber amplifiers.
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Gallo et al. (1999) studied this question.
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