Concept Demonstration of 3D Waveguides Shuffle Converter for Multi-Core Fiber/Single-Mode Fiber Fan-in Fan-out Configuration Toward Over 1, 000 Port Count. - Haisong Jiang; Yasuhiro Hinokuma; Sampad Ghosh; Ryota Kuwahata; Kiichi Hamamoto (IEICE Trans. Electron., 2021)