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How to Set the Wavelength
Tunable Lasers
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
111
How to Set the Wavelength Directly
You can set a constant wavelength.
To set the wavelength to 1545.500 nm:
1
Move to the Tunable Laser channel.
2
Move to the wavelength parameter, [
λ],
and press
Enter
.
3
Enter 1545.500 and press
Enter
.
How to Set a Relative Wavelength
You use a relative wavelength for heterodyning, for example, when you are
measuring the linewidth of DFB (distributed feedback) lasers.
The output wavelength,
λ,
is set from the base wavelength,
λ
0
, and the frequency
offset,
df
. The formula for calculating the output wavelength is:
where c is the speed of light in a vacuum (2.998
×
10
8
ms
−
1
).
To set a frequency offset of 1.000 THz from a base wavelength of 1545 nm:
1
Move to the Tunable Laser channel and press [Details].
2
Press [Menu]. The menu appears.
3
Move to <
Wavelength Mode
> in the menu and press
Enter
. A menu appears.
4
Move to <
Offset
>, by using the cursor key, press
Enter
, and press
Close
. You
see the screen in Figure 71.
λ
c
λ
0
λ
0
df
c
+
--------------------
=
Figure 71
Setting a Relative Wavelength