FX87 DWDM Tunable Laser Source User’s Manual
Page
18
of
39
Select a wavelength by pressing the
|Up|
and
|Down|
buttons, then press the
|Shift/Enter|
button to confirm the choice. The new wavelength then appears in the top right corner of the
display. To keep the previous wavelength effective, select a wavelength and then press the
|F1|
button (EXIT).
If the fiber under test carries a signal with WaveID details, select
[AUTO]
. Then FX87 determines
the wavelength automatically.
If the [AUTO] option is selected for a signal without WaveID or a modulated
signal, the wavelength value goes blank, and the measurement results are NOT
valid.
8.3.1 Setting Power Reference Level
To measure the fiber under test span loss, first set a reference level for each test wavelength.
For that press the
|F3|
button (MORE), then
|F2|
(REF). The resulting screen is shown below:
Selecting a reference option for PM measurement
•
REF SET
command: sets the current power value as the reference level. To do
that, make sure the cursor is at
REF SET
and press the
|Shift/Enter|
button. As
a result, the value onscreen changes to
--.--dB
(see the Figure below). The
reference level value is also saved to the device memory.
