Optical Spectrum Analyzers Chapter 8: Settings
Rev D, June 16, 2022 Page 30
allows for higher gain settings, which can result in a higher SNR of the measurement, especially for weak
sources, but also a slower update rate.
Note: When changing the Resolution and/or Sensitivity settings, the speed and stroke length of the motor in the
instrument will change. Please allow a few seconds for the motor to adjust to the new settings before performing
measurements.
Figure 27. Acquisition Settings Tab
The gain of the detectors can be specified using the combo box(es) on the Acquisition tab. The “Automatic”
option automatically adjusts the gain used after each acquired interferogram to optimize the SNR of the acquired
spectra. To manually set the gain to use, select the desired gain from the combo box. Note that the used gain
will be changed just before acquiring the next interferogram which can take several seconds. The gain can also
be set in the Signal window (see Section 7.2.5).
8.2.2. Environment Settings
In the Environment settings tab, it is possible to set whether the temperature, atmospheric pressure, and relative
humidity saved in each interferogram and spectrum should be measured using the built-in sensor in the
instrument or be set to a fixed value.
8.2.3. Interferogram Settings
In the Interferogram settings tab, it is possible to set the processing that is applied to each collected
interferogram.
The type of apodization to apply to each interferogram is set by the “Apodization” combo box. This setting is
also available in the Acquisitions settings bar in the main window. The available apodization functions are
described in Section 14.2.
In order to eliminate high-frequency spectral components, the interferograms can be cut to a shorter effective
length than that determined by the Resolution setting. To do so, check the “Cut interferogram” box and specify
the desired maximum optical path difference (in centimeters). The minimum optical path difference will be
automatically updated. The resulting resolution (in current x-axis unit) will be shown, under the condition that a
suitable resolution setting is selected. Which resolution mode is required is mentioned in a textbox just below
the resulting resolution value.
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