Investigation of Bend Loss Performance of Standard G.652D Fibres Relative to the ITU-T Bend Loss Requirements in Optical Access Networks

摘要

In this paper, we have investigated the detailed macro bend loss performance of 60 samples of G.652D fibres with MAC numbers in the upper range of MAC values that could typically be found in current G.652D fibres. The samples thus contain an elevated number of fibres with expected poor bending properties, and have been tested relative to the test limits in ITU-T Recommendation G.657, class A fibres. For the 30 mm-10 turn test, we have found that 2 % of the investigated fibres were outside the test limits at 1550 nm and 1621 nm. For the 20 mm-1 turn test, 12 % and 15 % of the investigated fibres at 1550 nm and 1621 nm, respectively, were outside the test limits. Evidence is found for a linear relationship between bend losses and MAC number. By choosing 7.40 as an upper limit for the MAC number, the percentage of investigated fibres outside the test limits has been reduced to zero percent in the 30 mm-10 turn test, and to 6 % and 11 % at 1550 nm and 1621 nm, respectively, in the 20 mm-1 turn test. In addition, we have removed the fibres with the highest bend losses.