Optical Fiber testing methods

Optical fiber In the erection, after the completion of the weld test work, the use of the instrument is mainly OTDR tester, with the Canadian EXFO ftb-100b portable Chinese color touch screen OTDR tester (Dynamic range of 32/31, 37.5/35, 40/38, 45/43db), you can test, The position of optical fiber breakpoint, the whole loss of optical fiber link, the loss distribution along the fiber length, the joint loss of optical fiber junction. In order to test the accuracy, the pulse size and width of the OTDR tester should be selected appropriately, according to the index of the index n value of the refraction rate given by the factory.

When judging the point of failure, if the length of the optical cable is not known beforehand, can be placed in the automatic OTDR, find the general location of the fault point, and then placed in the advanced OTDR.

The pulse size and width of the selection of small, but to correspond to the length of the cable, the blind area to reduce until the coordinates with the line, pulse width smaller the more accurate, of course, the pulse too small after the curve shows the noise wave, to just right. Then added to the probe, the purpose is to prevent the vicinity of the blind spot is not easy to detect.

On the judgment breakpoint, if the breakpoint is not in the continuation box, it will open the Close continuation box, connect the OTDR tester, test the fault point distance from the test point, using the Mi Peu on the cable is easy to find fault points. ---computer science (http://bianceng.cn)

The use of the meter to find fault, the stranded cable also has a stranded rate problem, that is, cable length and fiber length is not equal, fiber length is about 1.005 times times the length of optical cable, using the above method can successfully eliminate multiple breakpoints and high loss points.