YASKAWA AQ6370B - Page 322

App-10
IM 735302-01E
When “TYPE” is PEAK.
L0
L1LA LC LB
Lp
Lp-TH
Lmin
• 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
λ
1, set the leftmost wavelength crossing the level (LOG) of |Lp-
threshold value (THRESH[dB])| to
λ
A.
• Between
λ
0 and
λ
1, 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 × (
λ
A -
λ
'C) +
λ
'C
λ
B = K × (
λ
B -
λ
'C) +
λ
'C
• Obtain the NOTCH width from the following equatio.
Δλ
=
λ
A -
λ
B
• Obtain the center wavelength
λ
C from the following equation.
λ
C = (
λ
A +
λ
B)/2
Appendix 2 Data Calculation Algorithms for Spectrum Widths