6-15
IM AQ6376-01EN
Analysis
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App
Index
Parameter Settings Related to Channel Detection
These parameters are used to set threshold level and the like for WDM channel
detection.
THRESH LEVEL
This parameter is used to set the threshold level for channel detection.
This setting determines how far down in decibels from the peak level to detect a mode
peak as a channel.
MODE DIFF
This parameter sets the minimum value for the peak/bottom difference during channel
peak detection.
If the waveform peak/bottom difference equals or exceeds this value, it is detected as a
mode peak.
DISPLAY MASK
This parameter sets the mask level value for channel masking.
Channels at a level equal to or below this setting are masked.
THRESH LEVEL
MODE DIFF
DISPLAY MASK
Parameter Settings Related to Noise Level Measurement
These parameters are used to set the interpolation method and bandwidth for noise level
measurement.
NOISE ALGO
Select one of the five algorithms shown below for measuring the noise level.
If AUTO-FIX or AUTO-CTR is set, the measurement parameters at another noise level
are set automatically. To set the values manually, select MANUAL-FIX or MANUAL-CTR.
• AUTO-FIX
Automatic settings (FIX type)
• MANUAL-FIX
Manual settings (FIX type)
• AUTO-CTR
Automatic settings (CENTER type)
• MANUAL-CTR
Manual settings (CENTER type)
• PIT
Automatic settings (PIT type)
Note
• If AUTO-FIX, AUTO-CTR, or PIT is selected, the NOISE AREA and MASK AREA parameters
are set automatically according to the measured waveform. FITTING ALGO is set to
LINEAR.
• See appendix 4, “WDM Analysis Function” for a description of the WDM analysis algorithms
and parameters.
6.7 WDM Transmission Signal Analysis (Except Wavenumber Mode)