Bragg gratings have been written in germanium-doped optical fibers that have been treated to remove the UV absorption bands associated with oxygen-deficient defects. When one is using high-intensity 193-nm light from an ArF excimer laser to fabricate the gratings, the refractive index increases and the grating transmission spectra are similar to those obtained in standard (untreated) fiber.

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Journal Optics Letters
Albert, J, Hill, K.O., Johnson, D.C., Bilodeau, F., Mihailov, S. J., Borrelli, N.F., & Amin, F. (1999). Bragg gratings in defect-free germanium-doped optical fibers. Optics Letters. doi:10.1364/OL.24.001266