App-23
IM 735302-01E
Appendix
Fitting Algorithm
While the setting to AUTO-CTR, LINEAR is used for the fitting algorithm, which is
calculated as follow.
• Obtain ELi and ERi as the level (LOG) of each position of the noise areas NA_Li and
NA_Ri.
• Use the data of the straight line connecting the two points of ELi and ERi to fill the
inside of the fitting range.
• Set the level of
λ
i of the data generated in the fitting to the noise level LNi.
Note
Due to being set to LINEAR, it is not possible to set the mask areas.
PIT
Noise Algorithm
Obtain the noise areas for measured waveform to the minimum level position of a before
the next channel in each channel.
When inside noise areas obtain at the left and right noise areas of each channel. outside
noise areas is applied.
When the number of WDM channels “n” is 1
Internally obtain the measurement resolution of SNi calculation trace and the value of
the noise measurement point NOISE AREA in accordance with the resolution, and then
obtain the values from the following equations.
NA_Ri =
λ
i + NOISE AREA
NA_Li =
λ
i - NOISE AREA
When the number of WDM channels “n” is 2 or more
i=1
NA_Li =
λ
i - (
λ
Ni -
λ
i)
NA_Ri =
λ
Ni
i=2,3,…,n-1
NA_Li =
λ
N(i - 1)
NA_Ri =
λ
Ni
i=n
NA_Li =
λ
N(i - 1)
NA_Ri =
λ
i + (
λ
i -
λ
N(i -1))
Fitting Algorithm
While the setting to PIT, LINEAR is used for the fitting algorithm, which is calculated as
follows.
• Obtain ELi and ERi as the level (LOG) of each position of the noise areas NA_Li and
NA_Ri.
• Use the data of the straight line connecting the two points of ELi and ERi to fill the
inside of the fitting range.
• Set the level of
λ
i of the data generated in the fitting to the noise level LNi.
Note
Due to being set to LINEAR, it is not possible to set the mask areas
Appendix 4 Details of WDM Analysis Function
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