App-30
IM AQ6376-01EN
Appendix 5
Details of Optical Amplifier Analysis
Function
This function enables the analysis of gains and NF (noise figures) of optical fiber amplifiers.
Items to be analyzed
λ
i
Center wavelength of each channel. -> Center frequency during the frequency
mode.
LINi
Signal optical power of each channel (after OFFSET compensation)
LOUTi Output optical power of each channel (after OFFSET compensation)
LASEi ASE power of each channel (after OFFSET compensation)
Rbi
Measurement resolution of each channel
Gi
Gain of each channel
Nfi
NF of each channel
List of parameters
Related to channel detection
Parameter
Default
Setting Range
Unit
Description
THRESH
20.0
0.1 to 99.9
dB
Threshold value for channel detection.
MODE DIFF
3.0
0.0 to 50.0
dB
Minimum value of the peak/bottom difference during channel detection
OFFSET(IN)
0.00
−99.99
to 99.99
dB
Level offset value of signal optical power.
OFFSET(OUT)
0.00
−99.99
to 99.99
dB
Level offset value of output optical power.
ASE ALGO
AUTO-FIX
AUTO-FIX
MANUAL-FIX
AUTO-CTR
MANUAL-CTR
-
Selection of the algorithm for ASE level measurement.
FIT AREA
0.40nm
0.01 to 10.00nm
nm
A range of waveform data for use in ASE level analysis is specified as a
range centering on channel wavelengths.
When A_ALGO is
•
AUTO-FIX:
"AUTO"
•
MANUAL-FIX:
**.**
•
AUTO-CTR:
"Between Ch"
•
MANUAL-CTR: "Between Ch"
MASK AREA
0.20nm
0.01 to 10.00nm
nm
Of the waveform data, specify the signal optical spectrum range for
masking, which centers on the channel wavelength.
When A_ALGO is
• AUTO-FIX:
"-"
• MANUAL-FIX
When F_ALGO is LINEAR: "-"
Other cases: input of parameter value.
• AUTOL-CTR:
"-"
• MANUAL-CTR
When F_ALGO is LINEAR: "-"
Other cases: input of parameter value.
Apply the limiter during input to ensure FITTING AREA is MASK AREA or
more.
FITTING ALGO
LINEAR
LINEAR
GAUSS
LORENZ
3RD POLY
4TH POLY
5TH POLY
-
Selection of the fitting algorithm for obtaining ASE levels
POINT
DISPLAY
ON
ON / OFF
-
ON/OFF for the function to display data range used for fitting in the
waveform window.
RES BW
CAL DATA
MEASURED
CAL DATA
-
Set the method for calculating the measurement resolution RBi of each
channel.
MEASURED: Determine the value of the THRESH 3dB width for each
channel from the TRACE B waveform and set to RBi.
CAL DATA: Set the actual resolution value stored in the instrument to RBi.
SHOT NOISE
ON
ON / OFF
-
Shot Noise component is included in computation of the NF value.
ON: Shot Noise component included in computation of the NF value.
OFF: Shot Noise component not included in computation of the NF value.