Abstract

It is well known that nonlinear processes such as harmonic generation can be affected by the dispersion arising from periodic index modulations in the nonlinear medium [1,2,3]. Moreover, the frequency conversion giving rise to continuum generation in optical fibers can also be greatly enhanced near the photonic bandgap of a fiber Bragg grating (FBG) [4], Such enhancements show sufficient coherence to greatly increase the signal to noise ratio in frequency metrology measurements [5], While these experiments considered the transmitted continuum, gratings are also expected to generate light in the direction opposite to the continuum pulse propagation direction. FBGs have been previously considered as phase matching elements in reflection [2], This theoretical study computed harmonic generation and showed significant backward and forward light generation near the bandgap edges.

© 2007 IEEE