Structure parameter effects of PCF on dispersion for singlemode regime based on V-parameter

Abstract

In this paper, the dispersion of photonic crystal fiber (PCF) with five rings hexagonal geometry have investigated by varying different parameters. Many researchers had used small size of fiber ( small pitch distance) to ensure the single mode operation but decreasing the pitch distance leads to increasing the dispersion. It is important to get suitable pitch distance so that it is not large to avoid the multimode operation and not small to avoid high dispersion. In this work, this condition has obtained depended on V-parameter. We have estimated the V-parameter by using the step-index fiber approximation. The Pitch distance which has been obtained is 5 um with low dispersion and low V-parameter ≤ 2.405 (single mode operation). In addition, to get more low dispersion and V-parameter, a doping with two different value of Ge ( 4.1% and 7%) has been applied in core.