Generation of heralded single photons beyond 1100 nm by spontaneous four-wave mixing in a side-stressed femtosecond laser-written waveguide

Abstract

We demonstrate a monolithically integrable heralded photon source in a femtosecond laser direct written glass waveguide. The generation of photon pairs with a wide wavelength separation requires a concomitant large birefringence in the normal dispersion regime. Here, by incorporation of side-stress tracks, we produce a waveguide with a birefringence of $1.64\times 10^{-4}$ and propagation loss as low as 0.21 dB/cm near 980~nm. We measure photon pairs with 300~nm wavelength separation at an internal generation rate exceeding $5.05\times 10^6$/s. The second order correlations indicate that the generated photon pairs are in a strongly non-classical regime.

5 pages, 5 figures

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• Heterogeneous integration of single InAs/InP quantum dots with the SOI chip using direct bonding
• High-birefringence direct UV-written waveguides for heralded single-photon sources at telecommunication wavelengths