Telecom-Band Spontaneous Parametric Down-Conversion in AlGaAs-on-Insulator Waveguides
M. Placke1, J. Schlegel2, F. Mann1, P. Della Casa2, A. Thies2, M. Weyers2, G. Tränkle2, and S. Ramelow1,3
Published in:
Laser Photonics Rev., vol. 18, no. 9, pp. 2301293, doi:10.1002/lpor.202301293 (2024).
Abstract:
Widespread commercial adoption of telecom-band quantum key distribution (QKD) will require fully integrated, room-temperature transmitters. Implementing highly efficient spontaneous parametric down-conversion (SPDC) on a platform that offers co-integration of the pump laser has been an outstanding challenge. Here, using such a platform based on AlGaAs-on-insulator waveguides, telecom-band SPDC (and SHG, second harmonic generation) is reported with exceedingly large efficiencies of 26 GHz generated pairs per mW over a 7 THz bandwidth, which would saturate the usable photon-flux for a 70-channel wavelength-multiplexed QKD system at merely 1.7 mW of pump laser power.
1 Institute for Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
2 Ferdinand-Braun-Institut, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
3 IRIS Adlershof, Humboldt-Universität zu Berlin, Zum Großen Windkanal 2, 12489 Berlin, Germany
Keywords:
integrated photonics, parametric nonlinearities, QKD
© 2024 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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