Fig. 2: Simulation results of the AlGaAsOI nanowaveguide. | Nature Communications

Fig. 2: Simulation results of the AlGaAsOI nanowaveguide.

From: Super-broadband on-chip continuous spectral translation unlocking coherent optical communications beyond conventional telecom bands

Fig. 2: Simulation results of the AlGaAsOI nanowaveguide.

a Group velocity dispersion (GVD) of the AlGaAsOI nanowaveguide. The optimum pump wavelength (1739.8 nm) is shifted from the zero-dispersion wavelength (ZDW) (1747.7 nm) to utilize the high-order phase matching, where the fundamental conversion band can be merged with the high-order phase matching band for an extended conversion bandwidth. b Normalised phase mismatch \(\left|{{\Delta }}\beta L/\pi \right|\) as a function of pump and signal wavelengths, with a waveguide length of 5 mm. The white straight solid and dash-dotted lines indicate the optimum pump wavelength and the ZDW. c Normalised CW as a function of waveguide length and signal wavelength with the pump at the optimum wavelength. d Normalised conversion efficiency (CE) versus signal-idler separation with a 5-mm-long AlGaAsOI nanowaveguide, when the pump is located at the optimum wavelength. The simulation results show a conversion bandwidth of over 1400 nm.

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