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Making Measurements
Measuring Wavelength and Power
Graphical display of optical power spectrum
A graphical display of optical power versus wavelength is shown from
the start wavelength value to the stop wavelength value. The start
wavelength value is shown in the upper-left corner of the graphical
display, and the stop wavelength value is shown in the upper-right
corner of the graphical display. The power scale is a fixed dB scale,
with +10 dBm at the display top and –53 dBm at the display bottom.
The power scale is not affected by the Power Offset value. In most
cases, the noise floor will be visible if the total input power is greater
than about –5 dBm.
The Agilent 86120C graphical display.
The Peak Threshold value is displayed as a dotted line. All peaks
above this dotted line are displayed in the List by Wavelength and List
by Power modes. All peaks below this line are not displayed. Adjust
the Peak Threshold value with the Setup key, and the THRSHLD softkey.
The wavelength limit start and stop wavelength values are used for the
graphical display even if the wavelength limit function is off.
The graphical display cannot be printed.
To see the graphical display
1 Press the List by WL or List by Power key.
2 Press the GRAPH softkey.
3 To exit the graphical display, press any softkey.