YOKOGAWA AQ6370D - Page 418

App-47
IM AQ6370D-01EN
Appendix
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App
Index
XdB_STOP-BAND
λ
i
Wavelength
Level [dB]
nominal wavelength
x
dB
xdB stop-band
Port
A
Port B
Parameter
THRESH
Procedure
Obtain the width (xdB_stop-Band) that centers on the nominal wavelength λi of each
channel and that is located below by the parameter THRESH_LEVEL both on the left
and on the right.
XdB_ELIMINATION BAND
λ
i
Wavelength
nominal wavelength
Port
A
Port B
Level [dB]
xdB Elimnation
band
xdB
Test Band
Maximum Level
in Test Band
Parameter
THRESH
TEST BAND
Procedure
• Perform the peak search within the range of the parameter Test_Band/2 by centering
on the nominal wavelength λi of a channel and obtain the peak level (LPi).
• Obtain the width (xdB_Elimination_Wavelength) that is above the peak level LPi
obtained in the above procedure by the parameter THRESH_LEVEL both on the left
and on the right.
Appendix 6 Details of Optical Filter Analysis Function