EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 256)

Modulation Schemes
248 PSO-200
For simplicity purposes, transitions corresponding to higher-order formats
are not illustrated here. The symbol mapping, {B
3
,B
2
,B
1
,B
0
}'{I,Q}),
depends on the specific implementation, and there are several possible
implementations for most modulation formats.
The PSO-200 default implementation and mapping of each modulation is
shown in the table below. To implement a different mapping, you must edit
the Gearbox configuration file as explained in Performing Detailed Bit
Pattern Analysis with the Gearbox on page 87.
Modulation
Format
Bits/
Symbol
Constellation
Chart
Default
Implementation
Mapping
CW –
No modulation
–
OOK 1
Remark: M = x-cut or
z-cut MZ biased at /4
BPSK 1
Remark: M = x-cut
MZ biased at 0
MZM
X0
B
0
I Q
0 0 0
1 1 0
MZM
X0 B
0
I Q
0 -1 0
1 1 0