Operator’s Manual
71
Magnitude Error
The magnitude error is the difference in amplitude between the reference symbol and the signal vector, as
shown in Equation 6. The numerical value displayed as Magnitude Error in the software is the RMS of all
the symbols captured during that acquisition.
Magnitude error
Magnitude Error = |𝑆𝑆| − |𝑅𝑅|
Magnitude Error
𝑅𝑅𝑅𝑅𝑅𝑅
= �
1
𝑁𝑁 �𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸
1
2
+ 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸
2
2
… + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸
𝑁𝑁
2
�
Equation 6 – Magnitude error calculation
PMD
The Polarization Mode Dispersion parameter is calculated within the Polarization Demultiplexing
Algorithm. The resolution of this measurement is determined by the number of samples per baud.
𝑃𝑃𝑀𝑀𝑀𝑀 =
(MaxTapIndex
𝑋𝑋
− MaxTapIndex
𝑋𝑋𝑋𝑋
)
SampleRate_Hz
Equation 7 - Polarization Mode Dispersion calculation
where MaxTapIndex parameter is the index of the highest FIR filter tap used within the CMA/MMA
algorithm.
Summary of Contents for IQS25
Page 1: ...Operator s Manual Optical Modulation Analyzer ...
Page 2: ......
Page 3: ...Optical Modulation Analyzer Operator s Manual August 2016 ...
Page 86: ...Optical Modulation Analyzer 78 ...
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Page 88: ...927295 00 Rev A August 2016 ...