Abstract
An optical data link is under development at CERN for readout of the tracking detectors in the future compact muon solenoid experiment (CMS) at the CERN large hadron collider (LHC). Radiation doses inside the experiment will be ∼ 20 Mrad and ∼ 10 14 n/cm 2 over a 10 year period of operation. The effects of neutron and gamma irradiation on the attenuation at 1550 nm wavelength have been studied in both germanium-doped and pure-silica core single-mode optical fibres. The induced attenuation was greater in the Ge-doped fibre than in the pure-silica core fibres for both neutron and gamma damage. Pure-silica core fibres will be therefore be used in the CMS tracker. The gamma induced attenuation in the pure-silica core fibres was dependent on total dose, allowing a prediction to be made for the transmission losses during LHC operation.
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