Anritsu MS9740B - Page 215

5.7 Measuring Optical Amplifier
5-65
5
Measurement Functions
ν: Frequency of optical signal (Hz)
Res
real
: Resolution calibrated by Res Cal (nm)
c: Light Velocity 2.9979 × 108 (m/s)
When NF Select is Total
The noise figure is calculated from the sum of noises due to four noise
sources.
))+++(·log(10=
4321
FFFFkNF
vs
Gh
Pase
F
∆⋅
⋅
⋅
=
ν
1
vaPinGh
Paset
F
s
∆⋅⋅⋅⋅
=
)(2
2
2
2
lν
G
F
1
3
=
)(
2
4
s
PinG
Paset
F
l ⋅
=
F
1
: Beat noise between optical signal and ASE optical output
F
2
: Beat noise between ASE optical output
F
3
: Optical signal shot noise
F
4
: ASE optical output shot noise
Paset : ASE optical output total power (W)
s
a
PasePaset
ν
ν
∆
∆
⋅=
9
10)
2/
1
2
1
( ⋅⋅
+
−
−
=∆ c
BPFBWBPFBW
a
svsv
ll
ν
BPFBW: Optical bandpass filter bandwidth (nm)