Strictly non-blocking 4×4 silicon electro–optic switch matrix
Zhou Pei-Ji, Xing Jie-Jiang, Li Xian-Yao, Li Zhi-Yong, Yu Jin-Zhong, Yu Yu-De†
       
(a) Schematic drawing of the strictly non-blocking 4×4 switch matrix with a PILOSS network and the state we measured. (b) Microscope view of the fabricated strictly non-blocking 4×4 switch matrix.