  We perform extended numerical studies to maximize the overall photon coupling
efficiency of fiber-coupled quantum dot single-photon sources emitting in the
near-infrared and telecom regime. Using the finite element method, we optimize
the photon extraction and fiber-coupling efficiency of quantum dot
single-photon sources based on micromesas, microlenses, circular Bragg grating
cavities and micropillars. The numerical simulations which consider the entire
system consisting of the quantum dot source itself, the coupling lens, and the
single-mode fiber yield overall photon coupling efficiencies of up to 83%. Our
work provides objectified comparability of different fiber-coupled
single-photon sources and proposes optimized geometries for the realization of
practical and highly efficient quantum dot single-photon sources.
