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App-10
IM AQ6370D-01EN
Appendix 2 Data Calculation Algorithms for Spectrum Widths
When “TYPE” is PEAK
λ
0
λ
1
λ
A
λ
C
λ
B
Lp
Lp-TH
λ
min
• Obtain the minimum level “LGmin.” Also, set the wavelength of this point to λmin.
• Obtain LG0 at the peak level (LOG) on the left of LGmin. Also, set the wavelength of
this point to
λ
0.
• Obtain LG1 at the peak level (LOG) on the right of LGmin. Also, set the wavelength of
this point to
λ
1.
• Of LG0 and LG1, set whichever is greater to Lp.
• Between
λ
0 and
λ1, set the leftmost wavelength crossing the level (LOG) of |Lp−
threshold value (THRESH[dB])| to
λ
A.
• Between
λ
0 and
λ1, set the rightmost wavelength crossing the level (LOG) of |Lp−
threshold value (THRESH[dB])| to
λ
B.
• Obtain
λ
A and
λ
B through multiplication by the value which is set to the multiplying
factor K.
λ
'C = (
λ
B +
λ
A)/2
λ
A = K × (
λA − λ
'C) +
λ
'C
λ
B = K × (
λB − λ
'C) +
λ
'C
• Obtain the NOTCH width from the following equatio.
Δλ
=
λA − λ
B
• Obtain the center wavelength
λ
C from the following equation.
λ
C = (
λ
A +
λ
B)/2