App-16
IM AQ6376-01EN
DFB-LD Analysis Function
The following parameters for DFB-LD light sources are analyzed collectively.
• -XdB WIDTH
• SMSR
• RMS
• POWER
• OSNR
Following table shows the details of parameters for DFB-LD analysis.
Parameter Abbreviation Default Value Setting Range Unit
Description
−XdB WIDTH
(Center WL/
SPWD)
ALGO
THRESH
ENVELOPE/
THRESH/RMS/
PK-RMS
-
THRESH
20.00
0.01 to 50.00
dB
THRESH2
20.00
0.01 to 50.00
dB
Valid only when ALGO is
ENVELOPE.
K
1.00
1.00 to 10.00
-
MODE FIT
OFF
ON / OFF
-
Valid only when ALGO is
THRESH.
MODE DIFF
3.00
0.01 to 50.00
dB
Invalid when ALGO is
RMS.
SMSR
SMSR MODE
SMSR1
SMSR1/SMSR2/
SMSR3/SMSR4
-
SMSR MASK
±0.00
0.00 to 99.99
nm
MODE DIFF
3.00
0.01 to 50.00
dB
RMS
ALGO
RMS
RMS/PK-RMS
-
-
THRESH
20.00
0.01 to 50.00
dB
-
K
2.00
0.01 to 10.00
-
-
MODE DIFF
3.00
0.01 to 50.00
dB
Invalid when ALGO is
RMS.
POWER
SPAN
0.40
0.01 to 10.00
nm
-
OSNR
MODE DIFF
3.00
0.01 to 50.00
dB
-
NOISE ALGO
PIT
AUTO-FIX/
MANUAL-FIX/
AUTO-CTR/
MANUAL-CTR/
PIT
-
-
NOISE AREA
AUTO
AUTO/
0.01 to 10.00
nm
-
MASK AREA
-
-/
0.01 to 10.00
nm
-
FITTING
ALGO
LINEAR
LINEAR/GAUSS/
LORENZ/3RD
POLY/4TH
POLY/5TH POLY
-
-
NOISE BW
0.10
0.01 to 1.00
nm
-
SIGNAL
POWER
PEAK
PEAK/INTEGRAL
-
-
INTEGRAL
RANGE
10
10 to 999
GHz
-
Concerning the algorithms for DFB-LD analysis, refer to data calculation algorithms for
spectrum widths and SMSR analysis algorithms.
Appendix 3 Details of Each Analytical Functions