Osnr Loading; Roadm - EXFO FVA-600 Guia Del Usuario

Typical Test Configurations
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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.
RX
TX
FVA-600
FTB-500
OSA
FLS-2300B
FVA-600
ASE Source

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.
OSA: Isolation and
cross-talk measurement
FVA-600
Low-loss
through path
Blocker
FLS-2600B
Drop filter
Tunable laser OSA: Power
ADD
uniformity and
filter
long-term
monitoring
OSA: Insertion
loss and Isolation