Optical bit-pattern recognition by use of dynamic gratings in erbium-doped fiber.
We present a novel optical bit-pattern-recognition technique that uses erbium-doped fiber at room temperature. Counterpropagating beams write a patterned gain-depletion grating in pumped erbium-doped fiber. This grating, recorded in the erbium gain medium, can be used for correlation with other optical bit patterns. We have demonstrated correlation of arbitrary return-to-zero bit patterns of as many as 8 bits at 1 Gbit/s . Theory suggests that scaling to higher bit rates is feasible.
Wey
J S
JS
Butler
D L
DL
Rush
N W
NW
Burdge
G L
GL
Goldhar
J
J