Coupling light emission of single-photon sources into single-mode fibers: mode matching, coupling efficiencies, and thermo-optical effects.We discuss the coupling efficiency of single-photon sources into single-mode fibers using 3D printed micro-optical lens designs.  Using the wave propagation method, we optimize lens systems for two different quantum light sources and assess the results in terms of maximum coupling efficiencies, misalignment effects, and thermo-optical influences. 
THERM