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Optical Fiber Communication Conference

Integrated source of telecom-band photon-pairs based on high index silica glass spiral waveguides

Liang Cui, Hao Feng, Xiaotian Zhu, Changyue Wang, Z. Y. Ou, Xiaoying Li, Brent E. Little, Sai T. Chu

Published Mar 1, 2023• 1 citation
Publisher

Abstract

We generate correlated photon-pairs via spontaneous four-wave mixing in high index silica glass spiral waveguides. Results show that spontaneous Raman scattering is the main noise origin, and propagation loss limits the optimum length of waveguides.
DOI
10.23919/ofc49934.2023.10116090

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We generate quantum correlated photon-pairs at 1550 nm telecom band via pulse-pumped spontaneous four-wave mixing in high-index doped silica glass (HDSG) waveguides. The input and output ports of the 30-cm-long on-chip HDSG spiral waveguide are coupled to standard polarization maintaining fibers, which brings convenience to mode excitation and photon-pair collection. The flattened group velocity dispersion of the TE mode in the spiral waveguide is about 39 ps/km/nm at 1550 nm. When pumping around 1550 nm, the wavelength range of the generated signal (idler) photons can be more than 20 nm. Experimental results show that, in room temperature, the measured coincidence-to-accidental ratio (CAR) is about 200 when the photon-pair production rate is about 2×10-5 pairs/pulse, and the main noise origin of the photon pair source is spontaneous Raman scattering. Our investigations show that the HDSG waveguide, which can be fabricated using CMOS compatible technologies, is a promising candidate for developing miniaturized quantum light sources.
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Sources of photon pairs based on spontaneous four-wave mixing in silica fibers are generally considered limited by the spectrally broad spontaneous Raman scattering noise. I experimentally show that fluorescence from native or residual doping defects in silica fibers can become preponderant in situations where Raman scattering is normally eliminated, revealing a new, to the best of my knowledge, source of noise in silica-fiber-based sources of pairs of photons. I show that this noise depends on the fiber used, and that a new parameter must be carefully surveyed for the optimization of a fibered source of entangled pairs of photons.