Tunable frequency conversion in doped photonic crystal fiber pumped near degeneracy

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

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Pages (from-to)1490-1496
Number of pages7
JournalOptica
Volume11
Issue number11
Early online date25 Oct 2024
DOIs
Publication statusE-pub ahead of print - 25 Oct 2024

Data Availability Statement

L. Murphy, M. Olszewski, P. Androvitsaneas, et al., “Dataset for ‘Tunable frequency conversion in doped photonic crystal fiber pumped near degeneracy’,” University of Bath Research Data Archive (2024), https://doi.org/10.15125/BATH-01411.

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