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We experimentally demonstrate wide-band (>100 THz) frequency down-conversionof near-infrared (NIR) femtosecond-scale pulses from an Er:fiber laser to themid-infrared (MIR) using four-wave-mixing (FWM) in photonic-chipsilicon-nitride waveguides. The engineered dispersion in the nanophotonicgeometry, along with the wide transparency range of silicon nitride, enableslarge-detuning FWM phase-matching and results in tunable MIR from 2.6-3.6 um ona single chip with 100-pJ-scale pump-pulse energies. Additionally, we observe >20 dB broadband parametric gain for the NIR pulses when the FWM process isoperated in a frequency up-conversion configuration. Our results demonstratehow integrated photonic circuits could realize multiple nonlinear opticalphenomena on the same chip and lead to engineered synthesis of broadband,tunable, and coherent light across the NIR and MIR wavelength bands fromfiber-based pumps.

Tunable mid-infrared generation via wide-band four wave mixing in silicon nitride waveguides