App-10
IM AQ6370D-01EN
Appendix 2 Data Calculation Algorithms for Spectrum Widths
When “TYPE” is PEAK
λ0
λ1λA λC λB
Lp
Lp-TH
λmin
• 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 λ0.
• Obtain LG1 at the peak level (LOG) on the right of LGmin. Also, set the wavelength of
this point to λ1.
• Of LG0 and LG1, set whichever is greater to Lp.
• Between λ0 and λ1, set the leftmost wavelength crossing the level (LOG) of |Lp−
threshold value (THRESH[dB])| to λA.
• Between λ0 and λ1, set the rightmost wavelength crossing the level (LOG) of |Lp−
threshold value (THRESH[dB])| to λB.
• Obtain λA and λB through multiplication by the value which is set to the multiplying
factor K.
λ'C = (λB + λA)/2
λA = K × (λA − λ'C) + λ'C
λB = K × (λB − λ'C) + λ'C
• Obtain the NOTCH width from the following equatio.
Δλ = λA − λB
• Obtain the center wavelength λC from the following equation.
λC = (λA + λB)/2
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