Practically feasible dispersion flattened fibers produced by VAD technique

Dispersion flattened fibers (DFF) with dispersion slope of +0.026 ps/km/nm/sup 2/ and Aeff of 50 m/sup 2/ were designed and fabricated taking bending loss and their productivity into account, and attenuation as low as 0.21 dB/km was successfully realized. The fiber structure of DFF more practically feasible is theoretically explored taking A/sub eff/, bending loss performance into account as well as dispersion characteristics. The VAD technique is employed to manufacture the fiber for the advantage of productivity in mass production.