Algorithm for analysis
NOMINAL WAVELENGTH
Parameter
ALGO
MODE DIFF
THRESH
TEST BAND
Procedure
• BOTTOM
Channel: Each mode bottom detected by a mode search
(Except for the mode bottoms at levels which are above
the mode at the lowest level by THRESH[dB] or more.)
Reference wavelength: Wavelength of each mode bottom.
Bottom wavelength/level: Wavelength/level of each mode bottom.
• NOTCH(B)
Channel: Wach mode bottom detected by a mode search
(Except for the mode bottoms at levels which are above
the mode at the lowest level by THRESH[dB] or more.)
Reference wavelength: 3dB-center wavelength with each mode bottom as the
reference (ALGO=BOTTOM).
Bottom wavelength/level: Wavelength and level of each mode peak.
• NOTCH(P)
Channel: Each mode peak detected by a mode search
(Except for the mode bottoms at levels which are above
the mode at the lowest level by THRESH[dB] or more.)
Reference wavelength: 3dB-center wavelength with each mode bottom as the
reference (ALGO=PEAK).
Bottom wavelength/level: Wavelength and level of each mode bottom.
• GRID FIT
Channel: Modes within the range of GRID wavelength ± (TEST
BAND/2) among the mode bottoms detected via a
mode search (except for the mode bottoms at levels
which are higher than the mode at the lowest level by
THRESH[dB] or more).
If the number of relevant modes in one GRID is more
than one, only the mode at the lowest level will be
regarded as the channel.
Reference wavelength: GRID wavelength nearest to each channel.
Bottom wavelength/level: Wavelength and level of the mode bottom of each
channel.
• GRID
Channel: A mode search shall not be performed. All the GRID
wavelengths within the range of analysis shall be the
channels.
Reference wavelength: GRID wavelength of each channel.
Peak wavelength/level: Bottom wavelength and bottom level within the range of
GRID wavelength ± (TEST BAND/2) of each channel.
Appendix 6 Details of Optical Filter Analysis Function
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