Analysis of lithium niobate all-optical wavelength shifters for the third spectral window

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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