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Using the Multi-Wavelength Meter
Displaying Wavelength and Power
Measuring broadband devices and chirped lasers
When first turned on (or the green Preset key is pressed), the Agilent 86120B
is configured to measure narrowband devices such as DFB lasers and modes
of FP lasers. If you plan to measure broadband devices such as LEDs, optical
filters, and chirped lasers, use the
Setup
menu first to reconfigure the instru-
ment. When broadband devices are selected, the display shows the
BROAD
annotation on the screen.
The measurement algorithm for broadband devices determines the wave-
length based upon the center-of-mass of the power spectrum. The
peak excur-
sion function is used to determine the value of the integration limits. Care
must be taken to ensure that the integration limits are above any noise. This is
especially true when measuring devices with sloping noise floors, like an
EDFA amplifier. For more information on peak excursion, refer to “Defining
Laser-Line Peaks” on page 2-16.
Instrument specifications apply when the Agilent 86120B is configured to
measure narrowband devices. Specifications do not apply when the instru-
ment is configured to measure broadband devices.
This feature applies to Agilent 86120B instruments with firmware version
number 2.0. When first turned on, the instrument briefly displays the firmware
version. Instruments with a firmware version number less than 2.0 do not have
this feature.
To measure broadband devices
1
Press the
Setup
key.
2
Press
MORE
twice, and then the
DEVICE
softkey.
3
Press the
BROAD
softkey.
To return to measuring narrowband devices, press
NARROW
.