Ultrafast infrared induced fiber Bragg gratings in a hydrogen-loaded SMF-28 fiber are shown to exhibit complex and, what we believe to be, novel spectral evolutions. It is believed that the induced grating peak profile in the fiber is nonsinusoidal as a result of the nonlinear absorption required to modify the material. Rouard’s method is used to show that the observed spectral evolution is a consequence of the saturation of the nonsinusoidal index change profile.
© 2008 Optical Society of America
Original Manuscript: December 3, 2007
Revised Manuscript: March 4, 2008
Manuscript Accepted: March 7, 2008
Published: April 30, 2008
Christopher W. Smelser, Stephen J. Mihailov, and Dan Grobnic, "Impact of index change saturation on the growth behavior of higher-order type I ultrafast induced fiber Bragg gratings," J. Opt. Soc. Am. B 25, 877-883 (2008)