EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 418)

Definitions and Calculation Methods
406 IQS-12004B
Bandpass Filters
The following table summarizes the analysis made with bandpass filters.
Bandpass Filters
Central Wavelength X-dB center, where X is the dB level at which BW1 is measured
(see Central Wavelength (nm) on page 410).
When PDL is available, this is calculated using the average
attenuation.
Difference The difference between the defined wavelength and the
measured central wavelength.
IL Max attenuation over operating wavelength range (BW1) (see
Insertion Loss (dB) on page 410).
When PDL is available, this is calculated using the average
attenuation.
PDL (BW1) Max PDL over the range defined by BW1.
PDL (CW) PDL at the defined central wavelength (measured center for
Generic).
PDL (Central
wavelength ±x nm)
Max PDL over the range.
PDL (x to y nm) Max PDL over the range.
BW1, BW2, BW3 The bandwidth at dB level relative to the peak transmission (see
Bandwidth (nm) on page 408).
When PDL is available, this is calculated using the average
attenuation.
Flatness Delta attenuation across BW1 (see Flatness/Ripple (dB) on
page 411).
When PDL is available, this is calculated using the average
attenuation.