Optical loss variation due to fiber handling at the jointing point on the subscriber loop

Abstract

In response to the need for construction of new customer lines, usually the construction takes place at the joints where in-service lines are accommodated. It is very difficult to select and establish connection to a specific line without touching other in-service lines, thereby imposing additional curvatures upon them. Therefore, the losses are increased because of fiber bending; and, in such construction works, there is the fear that the transmission-loss variations exceed the tolerable threshold. To eliminate such fears, experiments on optical fiber handling are carried out and the factors which influence the transmission losses and the magnitude of such variations are clarified. Further, it is shown that by proper choice of the mode field diameter and the cut-off wavelength, it is possible to limit the variations of the transmission losses. The guidelines in the design of optical receivers which can tolerate these variations also are given.