Optimum values of air-filling fraction for photonic crystal fibers with different configurations and fixed number of air rings

In this study, a Gaussian amp function related to the Gaussian family is employed to approximate the output intensity profile of various arrangements of air holes in photonic crystal fibers (PCFs) with a fixed number of air rings (N = 4). It is shown that d/Lambda = 0.5 can be the best minimum value of air-filling fraction for all of the studied PCFs when lambda = 1.35 mu m, whereas, for lambda = 1.55 and 1.65 mu m, d/Lambda = 0.6 is suitable for achieving the maximum output intensity with very low confinement loss. (C) 2014 Optical Society of America