  We present a complete fabrication study of an efficiently-coupled microring
optical circuit tailored for cavity quantum electrodynamics (QED) with trapped
atoms. The microring structures are fabricated on a transparent membrane with
high in-vacuum fiber edge-coupling efficiency in a broad frequency band. In
addition, a bus waveguide pulley coupler realizes critical coupling to the
microrings at both of the cesium D-line frequencies, while high coupling
efficiency is achieved at the cesium 'magic' wavelengths for creating a lattice
of two-color evanescent field traps above a microring. The presented platform
holds promises for realizing a robust atom-nanophotonics hybrid quantum device.
