Measuring Wavelength And Power - Agilent Technologies 86121A User Manual

Measuring Wavelength and Power

Limiting the wavelength measurement range
Limiting the wavelength measurement range 3-3
Measuring broadband devices and chirped lasers 3-4
Graphical display of optical power spectrum 3-5
Instrument states 3-6
Power bar 3-6
Note
If the measured amplitudes are low, clean the front-panel OPTI-
CAL INPUT connector.
The wavelength range of measurement can be limited
with the wavelength limit function. When the wave-
length limit function is on (LIM ON), the WDM channel
analyzer has an input range from the start wavelength
to the stop wavelength. Both start and stop wave-
lengths can be chosen. The units of the wavelength
start and stop are the same as the currently selected
wavelength units. If wavelength units are later changed,
the start and stop wavelength units will change accord-
ingly. Note that a start wavelength limit in nm will
become a stop wavelength limit if THz is chosen. See
"To change the units of measure" on page
The graphical display always uses the start and stop
wavelength values to plot the power spectrum, whether
the wavelength limit function is on (LIM ON) or off
(LIM OFF).
Preset turns wavelength limiting on. Only responses
that are within the boundaries of the chosen start and
stop wavelength limits are measured.
To limit the wavelength range
1 Press the Setup key.
2 Press the WL LIM softkey.
3 Press the STARTWL softkey to adjust the start wavelength
value and then press RETURN when you are done.
4 Press the STOP WL softkey to adjust the stop wavelength
Measuring Wavelength and Power 3-3
3-7.