Figure 4

Variations of nonlinear coefficient γ and dispersion β ₂ in NIWs and DDWs with pump wavelengths at (a) 1550 nm and (b) 2150 nm. The solid curves are the designed parameters and the dashed curves are the corresponding parameters. (c) The taper width profile W(z) of NIWs and DDWs with pump wavelengths 1550 nm and 2150 nm.