EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 625)

OSA 619
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
The EDFA noise figure is calculated 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
),
 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 B
------------------------------------
1
G
---- + =
J s 