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Study of in fiber Mach–Zehnder interferometer based on two spaced 3-dB long period gratings surrounded by a refractive index higher than that of silica

PhotonicsOptical MaterialsEngineeringGratingsOptical PropertiesOptical TestingOptical WaveguidesInterferometryOptical MetrologyFiber Optic SensingOptical MeasurementFiber Mach–zehnder InterferometerFiber OpticsOptical SystemsFiber OpticOptical ComponentsRefractive IndexOptical Sensors