Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Manuel d'utilisateur Page 529

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Formulas Used with Your Optical Spectrum Analyzer
Optical Spectrum Analyzer 521
Bandwidth Calculation (Spectral Transmittance)
Bandwidth Calculation (Spectral
Transmittance)
Bandwidth is calculated using the following equation:
Where
b is the bandwidth at X dB,
λ
N
is the nominal wavelength,
λ
XdBLeft
is the wavelength on the left at which the power is X dB below
the power at the nominal wavelength.
λ
XdbRight
is the wavelength on the right at which the power is X dB
below the power at the nominal wavelength.
b2
Min λ
N
λ
XdBLeft
()λ
XdBRight
λ
N
(),{}=
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