EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) User Manual
Page 528
Formulas Used with Your Optical Spectrum Analyzer
520
FTB-5240S/5240BP
Central Wavelength Calculation (Spectral Transmittance)
Central Wavelength Calculation (Spectral
Transmittance)
The central wavelength is calculated using the following equation:
Where
a is the central wavelength,
λ
R
is the wavelength on the right at which the power is 3 dB below the
power at the nominal wavelength, and
λ
L
is the wavelength on the left at which the power is 3 dB below the
power at the nominal wavelength.
a
λ
R
λ
L
+
2
-------------------
=
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