144
8163A/B, 8164A/B, 8166A/B User’s Guide
5
Tunable Lasers
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
λ
c
λ
0
λ
0
df c
+
--------------------
=
Summary of Contents for 8163A
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