Performing A Cd Measurement Through Amplifiers - Viavi 8100 V2 Series User Manual

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Chapter 13 CD measurements using phase shift method

Performing a CD measurement through amplifiers

Performing a CD measurement through

The CD reference step is not required for measuring through amplifiers:

Connect the source and the 81DISPAP/81MRDISPAP 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

Select the appropriate CD test setup according to your application as

earlier defined in

Select Yes for Amplified link (It will limit the acquisition band from

1530 nm to 1565 nm).

Depending on the amplifier specification, it may be required to

adjust the acquisition band to a short wavelength range.

Amplified Network

Psource=Pi - 10dB

button to access the CD configuration menu.

"Configuring the CD test" on page

Ptester=- 10dBm max

button to perform CD measurement.

78000010220 Rev. 023

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