  Integrated optical devices may replace bulk crystal or fiber based assemblies
with a more compact and controllable photon pair and heralded single photon
source and generate quantum light at telecommunications wavelengths. Here, we
propose that a periodic waveguide consisting of a sequence of optical
resonators may outperform conventional waveguides or single resonators and
generate more than 1 Giga-pairs per second from a sub-millimeter-long
room-temperature silicon device, pumped with only about 10 milliwatts of
optical power. Furthermore, the spectral properties of such devices provide
novel opportunities of wavelength-division multiplexed chip-scale quantum light
sources.
