Anritsu MS9740B - Page 227

5.8 Measuring Optical Amplifier (Wavelength Division Multiplex)
5-77
5
Measurement Functions
● Point:
Select the noise level detection position when Detection Type is Point
Auto (Center):
The halfway point to the neighboring signal is used as the
noise level detection position. (See Figure 5.8.3-3) If
there is only one signal, then the noise level dependent on
Resolution during waveform measurement is used as the
detection position. (See Table 5.8.3-2)
Auto (Res): A value dependent on Resolution during waveform
measurement is used as the noise level detection position.
(See Table 5.8.3-2)
Manual: Use a manually set value as the noise level detection
position.
Table 5.8.3-2 Values Dependent on Resolution
Set Resolution (nm) Noise Point (nm)*
0.03
0.50
0.05
0.53
0.07
0.60
0.1
0.65
0.2
0.8
0.5
1.3
1.0
2.2
*: Distance (not span) from the signal wavelength
● NF Select
This selects the NF calculation method.
S-ASE: The noise figure is calculated from the beat noise between
the optical signal and the ASE.
Total: The noise figure is calculated from the sum of the
following noise values.
● Beat noise between optical signal and ASE
optical output
● Beat noise between ASE optical output
● Optical signal shot noise
● ASE optical output shot noise
● Actual Resolution
This selects the Actual Resolution used in the NF calculation.
Measured: This uses a value calculated from a formula. (See 5.8.4
“Calculation Method”)
Initial: This uses a value set at time of shipment.