Effects of materials with negative refraction and active impurities upon optical gain from 1-D PCFs

Optical amplification from 1-D photonic crystal fibers (PCFs) with layered structure composed of positive and negative refraction materials is studied with FDTD method in this paper. And we find out that the amplitudes of the separated narrow transmission spectra of surface waves at the interfaces between positive- and negative-refraction materials are greater than one, which differ from those of conventional optical fibers. Therefore, the unusual properties of these PCFs suggest a possibility of diverse applications to the super dense wavelength-division multiplexed communication systems, such as optical signal transmission and optical amplification.