Appendix 3 Details Of Each Analytical Functions - YASKAWA AQ6370B User Manual

Appendix 3 Details of Each Analytical Functions

SMSR Analysis Function
IM 735302-01E
This section describes the algorithms for analyses using the ANALYSIS 1 soft key in the
ANALYSIS. ANALYSIS 1 provides such functions as collective analysis of various light
sources, POWER analysis, SMSR analysis, and PMD analysis.
Use the optical spectrum after the measurement of DFB-LD to analyze the SMSR (Side
Mode Suppression Ratio) of DFB-LD.
Following table shows the details of parameters for NOTCH analyses.
Parameter Abbreviation
SMSR MODE MODE
SMSR MASK MASK
Algorithms for analyses are described here. They differ depending on the SMSR modes.
Algorithms for each mode of analysis are described below.
SMSR1
The next highest mode peak after excluding the highest mode peak level and the mask
setting range is defined as the side mode.
Mode Peak( A)
Side Mode( B)
MASK AREA
Algorithms of analysis for the SMSR1 mode are as follows:
• Perform a mode search to obtain the mode peak.
• Of the obtained mode peaks, set the point of the mode peak at the highest level (LOG)
to PA. Also, set the wavelength value of this point to
• Except for the mode peaks within the range of PA ±1000 × (SMSR MASK)/SPAN, set
the wavelength of the highest mode peak, which is next to PA, to
does not exist, set the wavelength value at the highest level outside the range of PA
± 1000 × (SMSR MASK)/SPAN to
wavelength value to B. Also, set the levels (linear values) for each point of
λ
to LA and LB.
• Obtain SMSR and from the following equations.
Δλ
SMSR = LA / LB
Δ = B - A
λ λ λ
Default Value Setting Range
SMSR1 SMSR1/SMSR2 -
±0.00 0.00 to 99.99
SMSR
A.
λ
B. If there is more than one
λ
Unit Description
Execution mode during
SMSR measurement
nm Setting of near-peak
mask range during
SMSR1 measurement
B. If a relevant point
λ
B, set the leftmost
λ
A and B
λ λ
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Index