Performance Enhancement for Ultrashort-Pulse Wavelength Conversion by Using an Aperiodic Domain-Inverted Optical Superlattice

We propose a designed aperiodic domain-inverted optical superlattice structure, where the performance of ultrashort-pulse wavelength conversion, relative-broad and flat conversion band with high conversion efficiency, has been well-balanced and enhanced in comparison with those in periodical or linear-chirped optical superlattices. Using this structure, we present a 5.5-nm flat band with almost no pulse distortion for picosecond wavelength conversion in the C-band. Moreover, the uniformity of all inverted domains may provide more convenience for poling. The above benefits may bring promising applications in generating broadband continuous-variable entanglement source and terahertz source with equivalent generation rate.