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In this work, we develop a design methodology to generate spectrally purephoton pairs in asymmetric heterogeneously coupled waveguides by spontaneousparametric down-conversion. Mode coupling in a system of waveguides is used todirectly tailor the group velocity of a supermode to achieve group velocitymatching (GVM) that is otherwise not allowed by material dispersion. Designexamples based on thin film lithium niobate waveguides are provided,demonstrating high spectral purity and temperature tunability. This approach isa versatile strategy applicable to waveguides of different materials andstructures, allowing more versatility in single-photon source designs.

Spectrally pure photon pair generation in asymmetric heterogeneously coupled waveguides