![](https://typeset.io/vs/PS_web.blurImage.webp)
![Fig. 4. (Color online) Center frequency versus 3 dB bandwidth. The solid curve (black) is the undoped coupler. The three high-frequency designs (red) have dc=Λc ¼ 0:105, while the three low-frequency designs (blue) have dc=Λc ¼ 0:145. In the high-frequency case, the short dashed curve has Λc ¼ 97:5 μm, the dotted curve has Λc ¼ 108:75 μm, and the dashed curve has Λc ¼ 120 μm. In the low-frequency case, the short dashed curve has Λc ¼ 97:5 μm, the dotted curve has Λc ¼ 127:5 μm, and the dashed curve has Λc ¼ 150 μm.](/figures/fig-4-color-online-center-frequency-versus-3-db-bandwidth-1ps1v5ct.webp)
Fig. 4. (Color online) Center frequency versus 3 dB bandwidth. The solid curve (black) is the undoped coupler. The three high-frequency designs (red) have dc=Λc ¼ 0:105, while the three low-frequency designs (blue) have dc=Λc ¼ 0:145. In the high-frequency case, the short dashed curve has Λc ¼ 97:5 μm, the dotted curve has Λc ¼ 108:75 μm, and the dashed curve has Λc ¼ 120 μm. In the low-frequency case, the short dashed curve has Λc ¼ 97:5 μm, the dotted curve has Λc ¼ 127:5 μm, and the dashed curve has Λc ¼ 150 μm.
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