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170 Fiber Optic Communications
1 0 1 0 1
Polar NRZ
data b'(t) t
0
After
differential b(t)
coding 0 t
After
duobinary
encoder m(t)
0 t
A in
Optical field
envelope of q(t)
MZM output 0 t
–A in
Optical power
of MZM output P out (t)
t
T b 2T b 3T b 4T b
Figure 4.36 Electrical/optical waveforms at various stages of optical duobinary signal generation.
