Periodic Modulation of Nonlinearity in a Fiber Bragg Grating:A Numerical Investigation

作     者：Antonio Francisco Gomes Furtado Filho Jose Rubens Rodrigues de Sousa Apiano Ferreira de Morais Neto Jose Wally Mendonca Menezes Antonio Sergio Bezerra Sombra 

作者机构：Teleinformatics Engineering DepartmentFederal University of CearaFortaleza-CeBrazil Telecommunications and Materials Science and Engineering Laboratory(LOCEM)Campus do PiciFortaleza-CEBrazil Department of InfrastructureTelecommu-nications Systems Specialist Laboratory and TeachingEastFederal Institute of CearaFortaleza CampusFortalezaBrazil 

出 版 物：《Journal of Electromagnetic Analysis and Applications》 (电磁分析与应用期刊（英文）)

年 卷 期：2012年第4卷第2期

页      面：53-59页

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：Conselho Nacional de Desenvolvimento Cientifico e Tecnologico CNPq CAPES and FUNCAP 

主　　题：Bragg Gratings Nonlinearity Modulation Optical Bistability Nonlinear Switching 

摘      要：We present numerical studies on the switching characteristics of a fiber Bragg grating (FBG) with modulation in the third order nonlinear index of refraction along it’s length. The FBG is operating in a continuous wave regime (CW). This study was done taking into account the possible asymmetry brought by the non harmonic modulation of the nonlinearity, leading to different reflection and transmission characteristics, that depend on the direction of propagation along the modulated nonlinear FBG. This phenomenon may be useful for applications like an optical isolator. It was found that for a set of values of the modulation parameter, the FBG can exhibit multistable states. The numerical studies were obtained starting from the coupled-mode equations solved from the coupled-mode theory and simulated using the fourth-order Runge-Kutta method.