Keysight DFB Laser Source Module User’s Guide
15
Getting Started with DFB Laser Sources
1
Operation Note
Maintaining Wavelength Accuracy Below Maximum Power
The wavelength accuracy of your DFB Laser Source module is optimized
when you set power to the maximum available for your module. As you
reduce power, the drive current through the laser diode changes; this can
mean that the actual output wavelength may differ from the wavelength
displayed on the user interface of your mainframe.
To ensure wavelength accuracy at less than maximum power you should
perform the steps listed below. You will need to use a wavelength meter,
we recommend the Keysight 86120C Multi-Wavelength Meter.
1 Set up your equipment as displayed in
.
Figure 5
Wavelength Accuracy Setup
2 On the user interface of your Keysight 8163A/B Lightwave Multimeter,
move to the DFB source module channel and perform the following
steps:
a
Move to [P], and press
Enter
.
b
Set the power value to the maximum power for the module. The
maximum power for the 81663A is 13 dBm.Since the maximum
displayed power of the 86120C is 10 dBm, we recommend you use a
power splitter or attenuator between the source and the wavelength
meter.
c
Move to [
λ
], and press
Enter
.
d
Set the wavelength to the value you require.
e
Enable the laser by pressing the button on the front panel of the
module.
3 Allow your wavelength meter to settle to a stable wavelength value.
Check the displayed value against the value displayed on the user
interface of your 8163A/B Lightwave Multimeter.
