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Using the Multi-Wavelength Meter
Measuring Laser Separation
To measure channel separation
1
Press the front-panel
Preset
key.
2
Press
List by WL
.
3
Press the Delta
On
key.
Use the
Off
key to turn off the measurement.
4
Select the type of separation to observe:
•
∆
WL
displays channel separation.
•
∆
WL /
∆
PWR
displays both channel separation and differences in power.
5
Use the and softkeys to select the reference laser line.
6
Press
SELECT
.
Press
SELECT
at any time to select a new reference. Press
RESET
at any time to
turn off the delta calculation.
Measuring flatness
You can use relative power measurements to measure flatness (pre-emphasis)
in a WDM system. Simply select one carrier as the reference and measure the
remaining carriers relative to the reference level. The power differences rep-
resent the system flatness. Press
RESET
to turn off the delta calculations so
that all responses are shown in absolute wavelength and powers.
To measure flatness
1
Press the front-panel
Preset
key.
2
Press
List by Power
.
This lists the input signals by power with the largest response listed first.
3
Press the Delta
On
key.
4
Select
∆
PWR
.
5
Use the and softkeys to select the first laser line.
6
Press
SELECT
.
7
Since the largest power signal is the reference, the relative power
measurements for the other responses shows system flatness.