Integrated optical source of polarization entangled photons at 1310 nm

We report the realization of a new polarization entangled photon-pair source based on a titanium-indiffused waveguide integrated on periodically poled lithium niobate pumped by a CW laser at $655nm$. The paired photons are emitted at the telecom wavelength of $1310nm$ within a bandwidth of $0.7nm$. The quantum properties of the pairs are measured using a two-photon coalescence experiment showing a visibility of 85%. The evaluated source brightness, on the order of ${10}^5$ pairs $s^{-1}GH{z}^{-1}m{W}^{-1}$, associated with its compactness and reliability, demonstrates the source’s high potential for long-distance quantum communication.