Large interconnects in photorefractives: grating erasure problem and a proposed solution

The known problem of grating erasure in photorefractive-based holographic optical interconnects can lead to limitations in the density of the system. This problem is analyzed for an architecture that uses spatially multiplexed beams (to eliminate cross erasure) and angularly multiplexed input beams to record multiplexed gratings in a bismuth silicon oxide (BSO) crystal to interconnect three beams to an array of 8 x 8 (64) detectors. Drawbacks of the time-exposure technique, which compensates for erasure, are analyzed. A novel photorefractive-based interconnect architecture is proposed, which uses holograms and read beams that are segregated to minimize erasure during recording and reading.