Gaussian profile fiber Bragg gratings exhibit narrow-bandwidth transmission peaks with significant group delay at the edge of their photonic bandgap. We demonstrate group delays ranging from 0.2 to 5.6 ns from a 1.2 cm structure. Simulations suggest such a device would be capable of enhancing the field intensity of incoming light by a factor of 800. Enhancement is confirmed by photothermally induced bistability of these peaks even at sub-milliwatt input powers with as much as a four-fold difference in the magnitude of their responses. The strong field intensities of these modes could significantly enhance desired nonlinear optical responses in fiber, provided the impact of absorption is addressed.
© 2014 Optical Society of America
Original Manuscript: November 7, 2013
Revised Manuscript: December 23, 2013
Manuscript Accepted: January 9, 2014
Published: February 6, 2014
Jeremy Upham, Israel De Leon, Dan Grobnic, Edwin Ma, Marie-Claude N. Dicaire, Sebastian A. Schulz, Sangeeta Murugkar, and Robert W. Boyd, "Enhancing optical field intensities in Gaussian-profile fiber Bragg gratings," Opt. Lett. 39, 849-852 (2014)