Abstract

It has been shown that photoinduced phase gratings can be created in Ge-doped silica fiber core by using standard holographic recording techniques.^1,2 Recently, it was suggested³ and shown experimentally⁴ that such fiber gratings have negative group-velocity dispersion (GVD) in the vicinity of the wavelength used to write the grating. Because this anomalous grating dispersion is orders of magnitude larger than the normal material dispersion of a glass fiber, an all-optical fiber pulse compressor in the visible wavelength would be achievable by combining the fiber’s self-focusing nonlinearity with the grating’s negative GVD. Because of the distributed feedback nature of the grating embedded fiber filter, a forward-propagating pulse will be coupled to the reflected pulse at all times, thus complicating the nonlinear interaction. In previous research³ pulse compression was predicted. However, it was not clear which parameters, besides the negative GVD, would affect the characteristics of a pulse during its propagation. The numerical simulation work in this paper shows the trade-off between parameters and establishes the limit on pulse compression.

© 1990 Optical Society of America