A non-contact system for measuring an insertion loss of a cable assembly with cable fibers includes a light source system that emits light and a launch connector supporting launch fibers. A detector system includes receive fibers supported by a receive connector. The detector system has detectors optically coupled to the receive fibers, with one detector directly optically coupled to the light source system for calibration. A first movable stage supports the launch connector and a second movable stage supports the receive connector. A launch optical system images output end faces of the launch fibers onto input end faces of the cable fibers of the cable assembly. A receive optical system images output end faces of the cable fibers onto input end faces of the receive fibers. The light exiting the receive fibers is detected and processed to determine the insertion loss of the cable assembly.