CROOS TALK
λ
i
Wavelength
nominal wavelength
Port A
Port B
Level [dB]
Test Band
SpacingSpacing
Test Band
Minimum Level
in Test Band
Maximum Level
in Test Band
Cross Talk(L)
Cross Talk(R)
Parameter
SPACING
TEST BAND
Procedure
• Perform a peak search within the range of parameter Test_Band/2 while centering on
the reference wavelength
λ
i of each channel and obtain the peak level (LP’’i).
• Perform a bottom search within the range of parameter Test_Band/2 while centering
on the point (
λ
i-
λ
SP) that is obtained by subtracting the parameter SPACING from the
reference wavelength
λ
i of each channel. Then, obtain the bottom level (LPLi).
• Perform the bottom search within the range of parameter Test_Band/2 while centering
on the point (
λ
i+
λ
SP) that is obtained by subtracting the parameter SPACING from the
reference wavelength
λ
i of each channel. Then, obtain the bottom level (LPRi).
• Use the values obtained in the above procedures to obtain the left and right cross
talks (XTLi, XTRi) of each channel from the following equations:
XTLi=LP’’i−LPLi
XTRi=LP’’i−LPRi
Appendix 6 Details of Optical Filter Analysis Function
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