YOKOGAWA AQ6370D User Manual

App-11
IM AQ6370D-01EN
Appendix
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App
Index
Appendix 3 Details of Each Analytical Functions
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.
SMSR Analysis Function
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
Default
Value
Setting Range Unit Description
SMSR MODE MODE SMSR1 SMSR1/SMSR2/
SMSR3/SMSR4
- Execution mode during SMSR
measurement
SMSR MASK MASK ±0.00 0.00 to 99.99 nm Setting of near-peak mask
range during SMSR1 or
SMSR3 measurement
Algorithms for analyses are described here. They differ depending on the SMSR modes.
Algorithms for each mode of analysis are described below.
SMSR1
The main mode is defined as the highest mode peak. The side mode is defined as the
highest mode peak outside of the mask area.
MASK AREA
SMSR
This mode peak is within the mask
area, so it is not the side mode.
Main Mode (λA)
Side Mode
(
λB
)
The analysis algorithm for the SMSR1 mode is as follows:
1. A mode search is performed to obtain the mode peaks.
2. The wavelength of the main mode is set to λA.
3. The wavelength of the side mode is set to λB.
If relevant points do not exist, the wavelength of the highest level outside of the mask
area is set to λB.
If there are multiple wavelengths that can be set to λB, the leftmost wavelength is set
to λB.
4. The levels (linear values) of λA and λB are set to LA and LB, respectively.
5. The SMSR and Δλ are obtained from the following equations.
SMSR = LA / LB
Δλ = λB − λA

YOKOGAWA AQ6370D Specifications

General

Brand	YOKOGAWA
Model	AQ6370D
Category	Measuring Instruments
Language	English