3-26
IM AQ6370D-01EN
3dB
Before resolution calibration
Peak value
3 dB bandwidth = Resolution bandwidth
The number displayed on the soft key
Filter response of the optical
spectrum analyzer
After resolution calibration
Equivalent noise bandwidth = Resolution bandwidth
The equivalent noise bandwidth is the width of the
equivalent rectangle formed by keeping the spectrum
area constant.
Filter response of the optical
spectrum analyzer
3 dB
width
Calibration table (CAL DATA)
Factory default resolution
bandwidth
Equivalent
noise
bandwidth
Calibration table (CAL DATA)
Resolution bandwidth after executing
resolution calibration
Value stored in the AQ6370D
MEASURED
Peak value
TRACE B waveform
Measurement resolution used in the analysis algorithm (e.g. EDFA-NF)
If the RES BW parameter is set to
“MEASURED,” the resolution
bandwidth is determined from the
TRACE B waveform.
If the RES BW parameter is set to “CAL
DATA,” the resolution bandwidth stored
in the AQ6370D is used.
Resolution calibration executed
Resolution Calibration
Not executed or cleared
The analysis algorithm other than EDFA-NF uses the value stored in the AQ6370D.
For details on the RES BW parameters, see “NF computation related parameters”
in the explanation of section 7.8.
3 dB
Clearing the Resolution Calibration Value
The calibration table of equivalent noise bandwidth is cleared. After clearing, the 3 dB
width resolution bandwidth is used in the analysis algorithm calculations.
Use this function when you need to align with existing analysis data.
3.8 Resolution Calibration
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