Designing a graded index depressed clad non-zero dispersion shifted optical fiber for wide band transmission system

摘要

Non-zero dispersion shifted fibers (NZ-DSFs) find extensive use in wavelength division multiplexed (WDM) system as it reduces the non-linear effects like four-wave mixing (FWM) generation. A depressed clad graded index fiber with a central dip in the refractive index profile, as well as without dip, has been modeled to perform as an NZ-DSF using the spot size optimization technique. The performance characteristics of the proposed NZ-DSF have been studied by changing different fiber parameters; such as inner core radius (a), relative refractive index differences (Delta(+)), normalized end position of depressed clad (C), depression parameter (rho), etc. for a given value of Petermann-2 spot size ((W) over bar). By suitably adjusting the fiber parameters, the effective core areas (A(eff)) as simulated here are very large (similar to 80 mu m(2)) so that the effect of non-linearities upon them can be minimized. These NZ-DSFs have also been optimized for WDM transmission system. The dispersion slopes of the proposed fibers with and without dip have been estimated which are comparable with the reported results. (c) 2006 Elsevier GrnbH. All rights reserved.