Polarization dependency of the metal-coated eccentric fiber

Abstract

The transmission losses and lengths of two polarized fundamental modes for a metal-coated eccentric core optical fiber (ECOF) are considered based on the finite-element method. Three typical thin metal films (Au, Ag, and Cu) are used and deposited on the walls of the cladding of ECOF. The variations of the transmission losses and lengths are investigated with different eccentricity, core radii, and metal film species. The numerical results indicate that the optical spectrum of a metal-coated ECOF can be tuned easily by changing the structure parameters of the fiber. The fundamental mode of metal-coated ECOF shows good polarization dependency. It is forecasted that the attenuation difference between the two polarization modes may be used to design an in-fiber polarizer.