How to Perform a Wavelength Sweep
Tunable Lasers
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
117
You cannot choose a repeat mode for a continuous sweep. All multi-cycle sweeps
are one-directional, see Figure 73.
To execute a continuous wavelength sweep over the range 1520 nm to 1560 nm,
three times, at a speed of 5 nm/s:
1
Move to the Tunable Laser channel and press [Details].
2
Move to [
Sweep
Mode
] and press
Enter.
3
Move to the <
Continuous
> sweep mode and press E
NTER
.
4
Move to
[λ
Start
] and press
Enter.
5
Enter 1520.000 and press
Enter
.
6
Move to
[λ
Stop
] and press
Enter.
7
Enter 1560.000, press
Enter
.
8
Move to [
Sweep
Cycles
] and press
Enter.
9
Enter 0003 and press
Enter
.
10
Move to
[
Vsweep
] and press
Enter
.
11
Move to 5 nm/s, by using the cursor key, and press
Enter
.
12
Move to
[
Step
] and press
Enter
.
13
Enter 1.000 and press
Enter
.
N O T E
For a <
Continuous
> sweep, [
Step
] sets the wavelength interval between output
triggers, if you have set <
Output Trigger Mode
> to <
Step Finished
Use Output Triggering” on page 126
.
14
Press the [Active] hardkey on the front panel of your Tunable Laser module to
enable the optical output.
15
Press [Run Swp] to start the sweep.
N O T E
If an error box appears displaying the text "Sweep parameters inconsistent" after
you try to start a continuous wavelength sweep, one of the following cases of
sweep parameter inconsistency has occurred:
•
[λ
Start
] is less than
[λ
Stop
].
•
The sweep time is too short. Adjust
[
Vsweep
],
[λ
Start
], or
[λ
Stop
].
•
The sweep time is too long. Adjust
[
Vsweep
],
[λ
Start
], or
[λ
Stop
].
•
The trigger frequency is too high. Adjust [
Step
]. The trigger frequency is
[
Vsweep
] divided by the [
Step
].
•
<
Coherence ctrl.
> is the chosen [
Mod src
]. Choose another modulation source
as the [
Mod src
].
16
A continuous sweep can end in two ways:
