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Chirped optical superlattices for broadband wavelength conversion

We investigate wavelength conversions based on chirped optical superlattices, such as linearly chirped and sinusoidally chirped optical superlattices, through cascaded second-order nonlinear processes for wavelength division multiplexing application. They are compared with periodic optical superlattices in terms of bandwidth, efficiency and response flatness. The sinusoidally chirped optical superlattice shows more excellent overall performance than the periodic and linearly chirped optical superlattices.