An electrically controlled holographic switch is proposed as a building block for a free-space optical interconnection network. The switch is based on the voltage-controlled photorefractive effect in KLTN crystals at the paraelectric phase. It is built of electrically controlled Bragg gratings stored in the volume of the crystal. A compact switch that connects four high-speed fiber-optic communication channels with high efficiency is demonstrated experimentally. The switch performance is investigated and optimized. This switch is extremely attractive for cascaded switching arrays such as those found in multistage interconnect networks.
© 2000 Optical Society of America
(060.2330) Fiber optics and optical communications : Fiber optics communications
(090.4220) Holography : Multiplex holography
(090.7330) Holography : Volume gratings
(190.5330) Nonlinear optics : Photorefractive optics
(200.4650) Optics in computing : Optical interconnects
Benny Pesach, Guy Bartal, Eli Refaeli, Aharon J. Agranat, Joel Krupnik, and Dan Sadot, "Free-Space Optical Cross-Connect Switch by Use of Electroholography," Appl. Opt. 39, 746-758 (2000)