English

Abstract

In this paper we have first formulated a matrix for the coupled equations of Long Period Fiber Grating(LPFG) and then we have given a brief about the optigrating 4.2.2 software on which the simulations have been performed which is followed by designing of a Long Period Fiber Grating(LPFG) by simulating on software Optigrating 4.2.2.During simulation we have taken the parameters of the fiber as the refractive indices of the core and cladding 1.46 and 1.45 repectively while the radius of the core and cladding 4.1μm and 62.5 μm repectively. In Long Period Fiber grating (LPFG) the fundamental guided mode couple light with co-propagating cladding modes at various wavelengths. We have designed a Long Period Fiber Grating(LPFG) of grating length 9cm with grating period 168.78μm for coupling fundamental core mode LP(00) to LP (08) mode at wavelength 1.525 μm. Keywords–Long Period Fiber Grating, Fundamental core mode, cladding modes, Refractive index, coupling