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Bragg-reflection waveguides (BRWs) fabricated from AlGaAs provide aninteresting non-linear optical platform for photon-pair generation viaparametric down-conversion (PDC). In contrast to many conventional PDC sources,BRWs are made of high refractive index materials and their characteristics arevery sensitive to the underlying layer structure. First, we show that thedesign parameters like the phasematching wavelength and the group refractiveindices of the interacting modes can be reliably controlled even in thepresence of fabrication tolerances. We then investigate, how thesecharacteristics can be taken advantage of when designing quantum photonicapplications with BRWs. We especially concentrate on achieving a smalldifferential group delay between the generated photons of a pair and thenexplore the performance of our design when realizing a Hong-Ou-Mandelinterference experiment or generating spectrally multi-band polarizationentangled states. Our results show that the versatility provided by engineeringthe dispersion in BRWs is important for employing them in different quantumoptics tasks.

Optimizing the spectro-temporal properties of photon pairs from Bragg-reflection waveguides