Murphy, Leah R., Olszewski, Mateusz J., Androvitsaneas, Petros  ORCID: https://orcid.org/0000-0001-5013-0282, Alvarez Perez, Miguel, Smith, William A. M., Bennett, Anthony J. ORCID: https://orcid.org/0000-0002-5386-3710, Mosley, Peter J. and Davis, Alex O. C.
2024.
Tunable frequency conversion in doped photonic crystal fiber pumped near degeneracy.
Optica
11
(11)
, pp. 1490-1496.
10.1364/OPTICA.537442
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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.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Publisher: | Optical Society of America |
| ISSN: | 2334-2536 |
| Date of First Compliant Deposit: | 1 November 2024 |
| Date of Acceptance: | 9 October 2024 |
| Last Modified: | 08 Jan 2025 22:20 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/173466 |
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