Hydrogen effects in installed cables and under accelerated conditions

摘要: Attenuation increases have been measured on installed cables containing high-phosphorus doped fibres, mainly at wavelengths above 1300 nm, the operating wavelength. The hydrogen concentration was determined in some of these cables, making possible a correlation with fibre-in-hydrogen tests. An accelerated aging test carried out which two types cable, each three fibre, were held 90°C. Using data from field measurements and test, it confirmed that results can be extrapolated to low pressures present cables. upper limit for degradation single-mode fibre after long period cable calculated, shown negligible.