METHOD OF OPTICAL LOSSES DETERMINATION IN COUPLED OPTICAL WAVEGUIDES IN REFLECTED LIGHT

摘要

The losses in an arbitrary ith optical fibre (eg. 5) of k optical fibres coupled together in an optical transmission line are determined, without separating said optical fibres from one another in the process, by coupling transmitted pulses into the series of the optical fibres (5-7) to be measured via a free-wheeling optical fibre (4), by measuring the energy or total power Ni-1,i and Ni,i+1 of pulses which are reflected from air gaps at the input and output of the ith optical fibre and at the input of the final optical fibre (7), and by the reflection from the end face of the final optical fibre (7) and the separate determination of the optical losses ( mu i, mu k) per unit of length of in each case the arbitrary non-final and the final optical fibre. IMAGE