Exfo FVA-600 Manuel d'utilisateur télécharger pdf (Page 34)

Typical Test Configurations 28

OSNR Loading

The Optical Signal to Noise Ratio (OSNR) is an indication of the amount of noise

present in a given transmission signal.

The FVA-600 is used to adjust the relative power of the data carrying signal (from Tx)

and the ASE noise (from FLS) while monitoring that ratio on the OSA until a given

target error rate is obtained at the receiver.

ROADM

You can use the FVA-600 to help you with ROADM testing; by adjusting and

controlling the power level of the incoming power signal from a tunable laser

source sent into the ROADM or system under test.

FVA-600

FTB-500

OSA

FLS-2300B

ASE Source

FLS-2600B

Tunable laser

FVA-600

Drop filter

OSA: Insertion

loss and Isolation

Low-loss

through path

Blocker

OSA: Isolation and

cross-talk measurement

ADD

filter

OSA: Power

uniformity and

long-term

monitoring

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Exfo FVA-600 Manuel d'utilisateur Page 34