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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 con-
figured 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 instrument. When broadband
devices are selected, the display shows the BROAD annotation on the screen.
The measurement algorithm for broadband devices determines the wavelength
based upon the center-of-mass of the power spectrum. The peak excursion 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 measur-
ing devices with sloping noise floors, like an EDFA amplifier. For more information
on peak excursion,
refer to "Defining Laser-Line Peaks" on page
Instrument specifications apply when the Agilent 86120B is configured to measure
narrowband devices. Specifications do not apply when the instrument 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 fea-
ture.
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.
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