Fig. 4: Pulse transmission in the straight/folded edge waveguide.
From: Pseudospin-polarized slow light waveguides with large delay-bandwidth product
a Snapshots of measured amplitude profiles at Time = 0.0 ns, 0.5 ns and 1.0 ns for the straight edge. The input Gaussian pulse is centered at 4 GHz and has a full bandwidth at half maximum of 3 GHz. b Snapshots of measured amplitude profiles at Time = 0.0 ns, 2.0 ns and 4.0 ns for the folded edge. Pulse transmission time in folded edge waveguide is 4.4 times of that in straight edge waveguide, indicating that the group index is increased from 1 to about 4.
