Preparing for Measurement
3-27
IM AQ6370E-02EN
3
Wavelength value of the previous resolution calibration
If calibration has not been performed or has been cleared, “No User Cal” will appear.
Executing the Resolution Calibration Value
8.
Tap the Execute. The calibration value will be executed.
Clearing the Resolution Calibration Value
8.
Tap the Initialize. The calibration value will be cleared.
Explanation
Typically the filter response of an optical spectrum analyzer is not rectangular, and thus the
resolution bandwidth differs slightly from the equivalent noise bandwidth. This difference
becomes prominent especially when the wavelength resolution is high (e.g., 0.05 nm or less). The
resolution calibration function measures the equivalent noise bandwidth at each resolution setting
and internally sets the resolution bandwidth to the result. The resolution bandwidth appears in
parentheses in each of the resolution soft keys on the resolution screen.
The resolution bandwidth accuracy affects the results of noise measurements and the results of
optical power measurements of wideband light sources. In detail, the resolution bandwidth is used
when the following analysis and computation functions are executed.
• WDM analysis
• EDFA-NF (optical amp gain, NF measurement)
• Power analysis
• OSNR and total power of DFB-LD analysis
• Total power of FP-LD analysis
• Total power of LED analysis
• Power spectral density markers, Integrated power markers
• SSER, STSSER and TOTAL POWER of ITLA analysis
3.7 Resolution Calibration
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