Digital free-space photonic switch structure using exciton absorption reflection switch (EARS) arrays

This letter proposes a novel digital free-space photonic switch structure using exciton absorption reflection switch (EARS) arrays. This switch structure uses microbeam interconnections suitable for a compact switch fabric. The low-loss interconnection necessary for high-speed operation can be achieved by using an optical circuit based on birefringent plates. An experimental switch (based on an 8*8 EARS array) with fiber array pigtails is fabricated and used to demonstrate 2-input, 2-output switching of 8-Mb/s signals. This digital switch may be applicable to large-scale, multistage switching networks for broadband telecommunication switching systems.<>