Temperature-independent flexible broadcasting based on cascaded χ (2) nonlinearities in a broadband type-0 step-chirped PPLN

Tunable temperature-independent triple-idler broadcasting of a signal into selective WDM channels to cover whole C and L bands is demonstrated utilizing cascaded second-order interactions in a 20-mm-long step-chirped PPLN with an engineered ∼28-nm-wide type-0 second-harmonic bandwidth.