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Lithium niobate on insulator (LNOI) has a great potential for photonicintegrated circuits, providing substantial versatility in design of variousintegrated components. To properly use these components in the implementationof different quantum protocols, photons with different properties are required.In this paper, we theoretically demonstrate a flexible source of correlatedphotons built on the LNOI waveguide of a special geometry. This source is basedon the parametric down-conversion (PDC) process, in which the signal and idlerphotons are generated at the telecom wavelength and have different spatialprofiles and polarizations, but the same group velocities. Such featuresfacilitate electro-optical manipulations with photons and, at the same time, donot require an additional compensation for the time delay. We show how thespectral properties of the generated photons and the number of their frequencymodes can be controlled depending on the pump characteristics and the waveguidelength. Finally, we discuss a special regime, in which narrowband light withstrong frequency correlations is generated at the telecom wavelength.

Flexible source of correlated photons based on LNOI rib waveguides