AslowlightstructureMach-Zehnderfiberinterferometeristheoreticallydemonstrated.Thesensitivityoftheinterferometerissignificantlyenhancedbythedispersionoftheslowlightstructure.Thenumericalresultsshowthatthesensitivityenhancementfactorvarieswiththecouplingcoefficientandreachesitsmaximumundercriticalcouplingconditions.