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.
NOTE For a <Continuous> sweep, [Step] sets the wavelength interval between output
triggers, if you have set <Output Trigger Mode> to <Step Finished>, see “How to
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.
NOTE 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:
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