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

Portable, modular platform designed for the construction, validation and maintenance of optical fiber networks

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Connections for the CD Measurement

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:

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 posi-

tioned 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

Chapter 14 CD measurements using phase shift method

Fiber patchcord

Performing a CD measurement through amplifiers

Fiber under test

Signal input connector of

the CD module

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