Infrared erasure of self-organized χ(2) gratings in high germania content optical fibers

Abstract
We demonstrate that the self‐organized χ(2) grating in a high germania content optical fiber can be erased by prolonged exposure to 1.064 μm radiation only. The decay rate, which is proportional to the fourth power of the 1064 nm intensity, is attributed to two‐photon absorption of the second‐harmonic light generated in the fiber.