The implications of integrated coupler dispersion for interference-facilitated photon pair separation (IFPS) are explored. As the photon pair non-degeneracy is varied, near-perfect separation fidelities can be preserved by anti-symmetry in the central wavelength splitting ratios, even though the coupler response may differ greatly from that of an ideal 50:50 splitter. Active coupler tuning can assist in achieving this anti-symmetry. Coupler dispersion is shown to produce new features such as novel interference visibility behaviour and entanglement-sensitive performance. When only a single input path is utilized, tailoring of spectral correlations in the post-selected output state becomes possible. A source of path-entangled bunched states based on the Bragg reflection waveguide (BRW) platform is designed for use in IFPS experiments, and a roadmap for testing IFPS behaviour is presented. This work informs the design and characterization of quantum circuits for achieving universal photon pair separation for states with highly tunable spectral and polarization properties.
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