IEEE Photonics Technology Letters · 2013 · 22 citations · 12 references
EngineeringMaterials EngineeringMaterials ScienceOptical MaterialsOptoelectronicsPhotonicsCladding MaterialsFiber Optic MaterialsFiber OpticsFiber PropertiesHigh-temperature MaterialsOptical FibersFiber Bragg GratingsHigh-temperature Optical StabilityHigh-temperature StabilityInterferenceReflectivitySingle-mode FibersSingle-mode OperationTemperature Stability
This letter reports a first time study on enhanced temperature (~800°C) stability of type-IIa as compared with type-I fiber Bragg gratings (FBGs) written by high repetition rate (5.5 kHz) 255 nm UV beam. Both the FBGs were written in high photosensitive Ge doped (~10 mole%) single mode fiber without hydrogen loading. Both the FBGs survived 800°C over 9 h, however, time rate of fall of type-IIa FBG reflectivity was ~3 times lower as compared with type-I. The high temperature stability of 255 nm written FBGs is attributed to enhanced core-cladding stress release in the strong seed grating written by highly stabilized interference fringes and high cumulative fluence of 255 nm, 5.5 kHz UV pulses.
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Fiber optic sensor technology: an overview
K. T. V. Grattan, Tong Sun · Sensors and Actuators A Physical · 2000 · 892 citations