High-birefringence direct UV-written waveguides for heralded single-photon sources at telecommunication wavelengths

Abstract

Direct UV-written waveguides are fabricated in silica-on-silicon with birefringence of $(4.9\pm 0.2)\times 10^{-4}$, much greater than previously reported in this platform. We show that these waveguides are suitable for the generation of heralded single photons at telecommunication wavelengths by spontaneous four-wave mixing. A pulsed pump field at 1060 nm generates pairs of photons in highly detuned, spectrally uncorrelated modes near 1550 nm and 800 nm. Waveguide-to-fiber coupling efficiencies of 78-91% are achieved for all fields. Waveguide birefringence is controlled through dopant concentration of $\mathrm{GeC}{\mathrm{l}}_4$ and $\mathrm{BC}{\mathrm{l}}_3$ using the flame hydrolysis deposition process. The technology provides a route towards the scalability of silica-on-silicon integrated components for photonic quantum experiments.

arXiv comment9 pages, 5 figures

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