LIGHT-REFLECTION METHOD FOR TRANSMISSION-LOSS MEASUREMENTS IN OPTICAL FIBER LIGHTGUIDES

摘要

The process relates to the field of fibre optics, and can be applied to the measurement of small optical losses in optical fibres of various types. …The process has the following steps:… Coupling a transmitted light pulse into the optical fibre to be measured via a free-wheeling optical fibre (4) whose length lx is at least half the length of the mode distribution set for this type of optical fibres; measuring the energy or the maximum power N0 of the pulse reflected from the output end face of the free-wheeling optical fibre (4); connecting the free-wheeling optical fibre to the optical fibre (5) to be measured; measuring the energy or the maximum power N of the pulse reflected from the output end face of the optical fibre (5) to be measured; and determining the optical losses mu per unit of length in the optical fibre to be measured. ……