Dispersion-shifted large-effective-area fiber for amplified high-capacity long-distance systems

We have designed and fabricated dispersion-shifted large-effective area-fiber (LEAF) including, in particular, two types of profile designs using the outside vapor deposition (OVD) method. The first type has a triangular core and an additional ring. The second uses a dual-ring profile, where the first ring has the same role as the triangular core in shifting the zero-dispersion wavelength (λ₀,) into the 1550-nm window. The dual-ring profile has a flat-top field distribution, which results in a slightly larger A_eff, than the triangular core profile. The triangular core design, however is preferred for low attenuation