Rear Panel; Termination Techniques; Termination Techniques For Single-Mode Fiber (Except 980 Nm) - JDS Uniphase BACKREFLECTION METER RM3750 User Manual

Rear Panel

The back of the meter (Figure 4) can vary with the model.
The components on the rear panel are described in Table 6.
Table 6: Rear Panel Components
Component
CAL Access to the User CAL value, for calibration purposes.
LOG Foot pedal jack for data logging.
RS232C RS232 serial interface port.

Termination Techniques

Termination is a technique used to block all backreflections beyond a certain point in a network
of components. In all measurement testing, two terminations must be made: the first (for
measuring BR ) is made before the DUT, for example, on the RM meter side; the second (for
0
measuring BR ) is made after the DUT. Both termination points need to be made as close as
tot
possible to the DUT to minimize the errors associated with Rayleigh backscattering in the fiber.
The backreflection of all components and connections between these two points is included in
the equation for calculating the backreflection value (BR) of the DUTs.

Termination Techniques for Single-mode Fiber (except 980 nm)

Termination for single-mode (except 980nm) is performed by mandrel wrapping.
High-attenuation bends in the fiber (bends with a relatively small radius) remove all
backreflection and can be made anywhere along the length of the cable. When measuring
backreflection levels below -60 dB, low-attenuation bends (bends with a relatively large radius)
10112341 Rev 002
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RM3 SERIES BACKREFLECTION METER
-
25 VA max
Fuse 1A/250V
Figure 4: Back of the Meter
Function
USER'S MANUAL
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