1 William N MacPherson , Robert RJ Maier , James S Barton, Julian DC Jones Heriot-Watt University, EPS, Applied Optics and Photonics, Edinburgh, UK Alberto Fernandez Fernandez, Benoît Brichard, Francis Berghmans SCK-CEN, Belgian Nuclear Research Centre, Mol, Belgium Jonathan C Knight and Philip St J Russell University of Bath, Opto-electronics Group, UK Lance Farr BlazePhotonics Ltd., Bath, UK Dispersion and refractive index in Ge, B-Ge doped and photonic crystal fibre following irradiation at MGy levels
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1 William N MacPherson, Robert RJ Maier, James S Barton, Julian DC Jones Heriot-Watt University, EPS, Applied Optics and Photonics, Edinburgh, UK Alberto.
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William N MacPherson, Robert RJ Maier, James S Barton, Julian DC Jones
Heriot-Watt University, EPS, Applied Optics and Photonics, Edinburgh, UK
Alberto Fernandez Fernandez, Benoît Brichard, Francis BerghmansSCK-CEN, Belgian Nuclear Research Centre, Mol, Belgium
Jonathan C Knight and Philip St J RussellUniversity of Bath, Opto-electronics Group, UK
Lance Farr BlazePhotonics Ltd., Bath, UK
Dispersion and refractive index in Ge, B-Ge doped and photonic crystal fibre
following irradiation at MGy levels
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Introduction
Instrumentation for use in nuclear radiation environments:-
• Nuclear reactors • Nuclear waste storage• High energy physics research • Fusion research
• Require systems for Data communications Remote monitoring Safety
Electronic / semiconductor based systems can be incompatible with harsh environment
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Fibre-optics in radiation environment
Data Links can use radiation hardened fibre:
compatible with radiation levels to MGy levelse.g. Sol gel derived material
fibres typically multi modei.e fibre core un-doped, cladding “depressed”
Fibre optic sensing
Interferometric sensing techniques require: single mode fibre (maintain phase information)
i.e. fibre core doped, cladding “pure SiO2”
Doped core is more susceptible to radiation damage
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Single-mode fibres
Complex dynamics
Radiation chemistry in doped core known to generate absorption bands
Loss of Transmission
Question:
Do other fibre parameters change?
i.e. refractive index and
dispersion ?Critical parameters for interferometric sensing techniques