Fig. 4: 19-core 3D-inscribed core multiplexer.

a Schematic of the glass-inscribed core multiplexer, which converts 19 single-mode inputs into the correct spatial layout to address the 19-core fiber. b A photograph of the fabricated core multiplexer on an Australian dollar coin to depict scale and the pigtailed and connectorized core multiplexer assembly. c Measured per-input-core IL of the core multiplexers, indicating uniform IL for all cores.