Slow-Light performance enhancement of delay line based on arced photonic crystal waveguide

In the present paper, we proposed a slow light structure using arced photonic crystal waveguide (PhCW) to design an optical delay line. A delay bandwidth product value is calculated by comparing the arced PhCW with a straight PhCW. It’s seen that the arced PhCW offers a very simple method to slow down the light speed with a bandwidth of 294 THz and a delay bandwidth product of 32.34. An average group index equals to 13 is demonstrated which yield to 110 fs delay time for a device footprint of 14 x 19 µm 2 . The signal shape is notably maintained constant over the proposed delay line. Furthermore, the suggested device is characterized by a small dispersion which leads to a slight group-velocity dispersion.