Product Bulletin
JDS Uniphase manual backreflectors provide
precise levels of return loss to transmitters,
which allows measurements of system sensitivity
or system degradation as a function of
backreflection. When used with a transmitter/
receiver pair and characterization equipment,
the backreflectors can be used to establish the
magnitude of reflections that significantly
degrade transmission system performance and
to characterize the problems they cause.
The backreflectors use JDS Uniphase's ultra
-linear attenuator prism and highly reliable
microlens technology, combined with a
micrometer with electronic display of return
loss. Two configurations of the VB8B
backreflectors are available; no coupler and
fused coupler.
The no coupler version has a single pigtail used
as both an input and an output port. It can be
used to generate very large levels of reflection.
Alternatively, it can be used with an external
coupler of the desired ratio to build
customized reflection test sets.
The fused coupler version is equipped with a
fused fiber coupler that splits the light,
providing monitor and output ports as well as
an input port. This version supplies lower
maximum backreflection than the no coupler
version because part of the input light is
diverted to the output port. The monitor and
output ports allow measurements to be made
using a transmitter and a receiver.
The backreflectors are battery-powered, which
provides portability and compact packaging.
Measurement Usage
· Specify the maximum allowable reflection
level for connectors, receiver pigtails, and
attenuators
· Verify optical isolator performance
· Select the most appropriate reflection-
insensitive light source for the system
Key Features & Benefits
· Operation at 1300 or 1550 nm
· 0.02 dB resolution
· Low polarization sensitivity
· Constant insertion loss
·Long battery life
Applications
·Transmitter/receiver development and testing
·Reflection test for connectors
· Quality assurance acceptance testing
·Laser development and production
Variable Optical
Backreflectors
(VB8B Series)