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Chapter 4 CD measurements using phase shift method
Performing a CD measurement through amplifiers
NOTE
You can modify the fiber length without performing a measurement again.
The CD results (dB/km) will be recalculated automatically.
Performing a CD measurement through amplifiers
The CD reference step is not required for measuring through amplifiers:
1
Connect the source and the ODM module at each end of the fiber under test.
Optical attenuators (OLA55 1 and OLA55 2) have to be positioned before and
after the amplified link.
VIAVI recommends to:
•
setup the front attenuator (OLA55 #1) so that the power level received by the
amplifier is 10 dB lower than the in-service power level (in normal operation).
•
setup the far end attenuator (OLA55 #2) so that the maximum received power
level by the CD tester is -10dBm max
81BBS2A or
OBS-5XX
2
Press the S
3
Select the appropriate CD test setup according to your application as earlier
defined in
4
Select
1565 nm).
5
Press the S
NOTE
Depending on the amplifier specification, it may be required to adjust the
acquisition band to a short wavelength range.
64
Amplified Network
OLA 55 #1
Psource=Pi - 10dB
button to access the CD configuration menu.
ETUP
"Configuring the CD test" on page
Yes
for Amplified link (It will limit the acquisition band from 1530 nm to
/S
button to perform CD measurement.
TART
TOP
User Manual
OLA 55 #2
Ptester=- 10dBm max
52.
700MAN902 Rev. 000
ODM
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