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RM3 SERIES BACKREFLECTION METER
USER’S MANUAL
10112341 Rev 002 Page 24 of 39
need to be made just before the high-attenuation bends in order to offset the small amount of
reflection caused by the high-attenuation bends.
1. Using the size of rod specified in the Inspection Report (see the Customized Features
and Test Data section), wind the cable around the rod until the reading displayed on the
RM meter no longer changes (approximately six turns). The diameter of the rod must be
suitable for the type of fiber connected to the output port jumper and for the wavelength in
use. To minimize any memory of the bends in the cable jacket, do not pull on the cable
while winding, and occasionally wind the cable in the opposite direction (figure 5a).
Figure 5a: Terminating the Jumper for BR Measurement for Single-mode (except 980nm)
2. The second termination is made after the DUT in order to obtain Br
tot
(figure 6a).
Figure 6a: Measuring Backreflection for Single-mode (except 980 nm)
Termination Techniques for Single-mode (980 nm) and Multimode Fiber
Termination is performed by using index-matching gel.
1. Apply index-matching gel directly to the fiber end (figure 5b).
2. After measuring BR
0
, clean the connector end in accordance with the Cleaning
Connectors section.