App-19
IM AQ6370D-01EN
Appendix
App
Appendix 4 Detailed Explanations of WDM
Analysis Function
This function provides the analyses of NOISE level and SNR in each mode within the
measurement range of WDM waveforms.
Items for analysis
NO.: Channel No. i
WAVELENGTH: Center wavelength λi of the channel
LEVEL: Level (peak level – noise level) Li of the channel
OFFSET WL: Relative wavelength to the wavelength of the reference channel (REF)
OFFSET LVL: Relative level to the level of the reference channel (REF)
SPACING: Wavelength spacing to the adjacent channel
LVL DIFF: Level difference from then adjacent channel
NOISE: Noise level LNi of the channel
SNR: SNR value SNi of the channel
GRID WL: Nearest GRID wavelength to the channel
MEAS WL: Center wavelength λi of the channel
REL WL: Relative wavelength to the nearest GRID wavelength of the channel
Note
Indications of dBm/nm and dBm/THz are forcibly changed to dBm indications before execution.
List of Parameters
Related to Channel Detection
Parameter Default Setting Range Unit Description
THRESH 20.0 0.1 to 99.9 dB Threshold value for channel detection.
MODE DIFF 3.0 0.0 to 50.0 dB
Minimum value for peak/bottom
difference during channel detection.
DISPLAY MASK OFF
OFF,
−100.0 to 0.0
dBm
Levels equal to or below this level are
not detected as WDM channels.
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