Nonlinear TE waves in an optically nonlinear curved waveguide and pulse compression

The propagation properties of the TE₀ mode in an optically nonlinear curved waveguide are examined in detail. As the input power increases, the self-focusing effect of the nonlinear core is found to largely reduce the radiation loss and to moderately reduce the mode-conversion loss. It is made clear from detailed examinations of the power transmissivity that the nonlinear curved guide can be used as a threshold device for a logical AND gate or an optical amplifier, and that the device property improves with the bend length and curvature radius. The optical pulse compression using the curved guide is also considered. It is shown that larger values of the bend length and peak input power are preferable for shorter output-pulse widths and lower power losses, respectively