Metallurgy

Materials science

Mode volume

Optical fiber

Coupling (piping)

Single-photon source

Photon

Physics

Multi-mode optical fiber

Optics

Single-mode optical fiber

Plastic optical fiber

Quantum dot

Optoelectronics

Fiber Bragg grating

Optics Express

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 O-band and C-band. 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.

Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots