Tunable frequency conversion in doped photonic crystal fiber pumped near degeneracy
- URL: http://arxiv.org/abs/2407.09266v1
- Date: Fri, 12 Jul 2024 13:48:21 GMT
- Title: Tunable frequency conversion in doped photonic crystal fiber pumped near degeneracy
- Authors: Leah R Murphy, Mateusz J Olszewski, Petros Androvitsaneas, Miguel Alvarez Perez, Will A M Smith, Anthony J Bennett, Peter J Mosley, Alex O C Davis,
- Abstract summary: Future quantum networks will rely on the ability to coherently transfer optically encoded quantum information between different wavelength bands.
We introduce a photonic crystal fiber with a germanium-doped core featuring group velocity matching at 1550 nm, the telecoms C-band, and 920 nm.
Large lengths of this fiber are used to achieve nanometer-scale frequency shifts between wavelengths around 920 nm with up to 79.4% internal conversion efficiency.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Future quantum networks will rely on the ability to coherently transfer optically encoded quantum information between different wavelength bands. Bragg-scattering four-wave mixing in optical fiber is a promising route to achieving this, but requires fibers with precise dispersion control and broadband transmission at signal, target and pump wavelengths. Here we introduce a photonic crystal fiber with a germanium-doped core featuring group velocity matching at 1550 nm, the telecoms C-band, and 920 nm, within the emission range of efficient single photon sources based on InAs quantum dots. With low chromatic walk-off and good optical guidance even at long wavelengths, large lengths of this fiber are used to achieve nanometer-scale frequency shifts between wavelengths around 920 nm with up to 79.4\% internal conversion efficiency, allowing dissimilar InAs dots to be interfaced. We also show how cascading this frequency conversion can be used to generate a frequency comb away from telecoms wavelengths. Finally, we use the fiber to demonstrate tunable frequency conversion of weak classical signals around 918 nm to the telecoms C-band.
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