The QES Series consists of integrated polarization entangled photon source modules operating based on Spontaneous Parametric Down-Conversion (SPDC) across the visible and near-infrared wavelength ranges. The system includes an integrated laser current driver and a USB control interface, eliminating the need for external driver electronics. It is available in two specialized grades: the Commercial (C) grade for laboratory environments and the CubeSat (S) grade optimized with a compact mechanical design  and a low power consumption of 0.5 W for spaceborne satellite platforms.