This paper presents the results of a comprehensive characterisation of special radiation resistant multi-mode optical fibres, including complementary irradiation tests during massproduction. Radiation-induced attenuation measurements were carried out at different wavelengths and the attenuation behaviour studied when varying the dose rate. Following a preliminary qualification performed upstream the production, CERN, the European Organization for Nuclear Research, validated the procurement of 500 km of fibre for installation in the accelerator complex and experiments. A strict quality assurance plan, including quality control and irradiation tests, was implemented for monitoring the characteristics of the supplied optical fibres all along the production process. The results show resistance to radiations consistently below 60 dB/km for a total dose of 10 kGy and a dose rate of 0.2 Gy/s and stable optical performance over hundreds of fibre spools produced during a six-year period.
Single mode (SM) 850 nm vertical-cavity surface-emitting lasers (VCSELs) are suitable for error-free (bit error ratio <10 -12) data transmission at 17-25 Gb/s at distances ~2-0.6 km over 50m-core multimode fiber (MMF). Reduced chromatic dispersion due to ultralow chirp of SM VCSELs under high speed modulation (up to 40 Gb/s) are responsible for the dramatic length extension. Good coupling tolerances of the SM devices to the MMF manifest their applicability for low cost optical interconnects. As the higher resonance frequency (up to 30 GHz) is reached at lower current densities in small aperture (3 m -diameter) devices the SM devices are also preferable due to reliability considerations
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