How to Set the Wavelength Tunable Lasers
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 123
Figure 68 shows an example of specified and permitted wavelength
range.
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.
Figure 68 Specified and Permitted Wavelength Range
λ [nm]
Specified Range
Permitted Range
1460 1580 16001450
Not to Scale
λ
cλ
0
λ
0
df c+
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