Dual-Wavelength Pumped Supercontinuum Generation and Temporal Reflection Dynamics in a Nonlinear Photonic Integrated Circuit

We demonstrate on-chip supercontinuum generation using dual-wavelength pumping in a nonlinear photonic integrated circuit fabricated from high-index doped silica glass. Femtosecond pulses at 1040 nm and 1560 nm interact through cross-phase modulation and temporal reflections, producing broadband spectra that exceed those from single-pump excitation. Temporal reflections arise when the 1040 nm pulse interacts with a soliton-like index barrier at 1560 nm, generating far-detuned dispersive waves that extend the continuum. Experiments and simulations show excellent agreement with phase-matching theory. These results represent the first demonstration of dual-pump supercontinuum generation on a chip and highlight temporal reflections as a key mechanism for bandwidth control in integrated nonlinear photonics.