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Making Measurements
Measuring Fabry-Perot (FP) Lasers
Measuring Fabry- Perot (FP) Lasers
The Agilent 86120C can perform several measurements on Fabry- Perot
lasers including FWHM and mode spacing. The display shows the mea-
surement results in the selected wavelength and amplitude units. In
addition, the mode spacing measurement always shows results in fre-
quency as well as the selected wavelength units. Refer to “Displayed
units” on page 2-12 to learn how to change the units. The number of
laser lines included in the measurement results is also listed as shown
in the following figure.
To characterize a Fabry- Perot laser
1 Press Appl’s.
2 Press FP TEST to measure the Fabry-Perot laser’s characteristics.
If you want to stop the updating of measurement data with each
sweep, press Single. Because Fabry- Perot lasers are sensitive to reflec-
tions it is good measurement practice to place an optical isolator or
attenuator between the laser and the Agilent 86120C.