Deterioration of the gain coefficient as a result of UV processing of hydrogen-loaded Er<sup>3+</sup> - and Er<sup>3+</sup>/Yb <sup>3+</sup> -doped silicate optical waveguides can be reduced by initial hypersensitization of the waveguide prior to bulk irradiation. This allows improved performance in active-grating devices such as distributed-feedback fiber amplifiers and lasers.
© 2001 Optical Society of America
J. Canning and K. Sommer, "Hypersensitization of rare-earth-doped waveguides for distributed-feedback amplifier and laser applications," Opt. Lett. 26, 1855-1857 (2001)