Conventional hydrogen loading of phosphosilicate optical fibers at relatively low temperatures (80 °C) is sufficient to enhance the fiber's photosensitivity after hydrogen outdiffusion, allowing permanent Bragg grating structures to be produced. Thermal sensitization is proposed to be a major contributor to stable index change.
© 2001 Optical Society of America
J. Canning and P-F. Hu, "Low-temperature hypersensitization of phosphosilicate waveguides in hydrogen," Opt. Lett. 26, 1230-1232 (2001)