EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 527)

Optical Spectrum Analyzer 519
C Formulas Used with Your
Optical Spectrum Analyzer
The following formulas are used in the various tests available with your
OSA module.
EDFA Noise Figure Calculation
According to EDFA theory, this measurement is obtained using the
following equation:
Where
P
ASE
is the power of the spontaneous emission amplified by the EDFA,
P
SSE
is the power of the spontaneous emission of the source,
G is the gain at this channel’s wavelength,
h is Plank’s constant (6,6256 x 10
-34
),
ν is the frequency of the channel, and
B is the noise equivalent bandwidth, as calibrated at this channel’s
wavelength.
EDFA noise figure
P
ASE
GP
SSE
–
Gh
νB
------------------------------------
1
G
---- + =
J s
⋅