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Bright, polarized, and high-purity single-photon sources in telecomwavelengths are crucial components in long-distance quantum communication,optical quantum computation and quantum networks. Semiconductor InAs/InPquantum dots (QDs) combined with photonic cavities provide a competitive pathleading to optimal single-photon sources in this range. Here, we demonstrate abright and polarized single-photon source operating in the telecom C-band basedon an elliptical Bragg grating (EBG) cavity. With a significant Purcellenhancement of 5.25$\pm$0.05, the device achieves a polarization ratio of0.986, single-photon purity of g^2 (0)=0.078$\pm$0.016 and single-polarizedphoton collection efficiency of ~ 24% at the first lens (NA=0.65) withoutblinking. These findings suggest that C-band QD-based single-photon sources arepotential candidates for advancing quantum communication.

Polarized and bright telecom C-band single-photon source from InP-based quantum dots coupled to elliptical Bragg gratings