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Digital Signal Processing for High Spectral Efficiency Optical Transmission
Digital Signal Processing for High Spectral
Efficiency Optical Transmission
1
Xiang Zhou
ATT Labs-Research, Middletown, NJ, USA
Jianjun Yu
ZTE USA Inc, NJ (NEC Labs America, USA)
2Outline
Motivation:??why?DSP
Pre‐transmission?DSP
? Digital?pulse?shaping
? Digital?pre‐equalization
Post‐transmission?DSP?for?high‐order?modulation?formats
? Polarization?tracking?and?compensation?algorithms
? Phase?tracking?algorithms
64Tb/s,?8b/s/Hz?demonstration?with?PM‐36QAM
Conclusions
3? Ever growing network traffic
drives the need for higher
capacity in the core network
? Historically it has been shown
that increasing bit rate per
channel and spectral efficiency
(SE) is more cost effective than
lighting more fiber pairs
Data rate per channel (Gb/s)
0
1
2
3
4
5
6
7
8
0 100 200 300 400
S
E
(
b
/
s
/
H
z
)
Deployed
To be deployed
Projected
demand
Growing Capacity demands higher SE
4Multi-dimension and multi-level coding
?
?
?
?
?
?
?
?
?
?
?
?
?
?
???
?
?
??
?
?
?
?
?
y
y
x
x
yy
xx
Q
I
Q
I
jQI
jQI
E
Optical field of an optical carrier
Information can be encoded/modulated on each one of the four dimensions
1) Higher spectral efficiency (SE)
2) Lower electrical processing speed
Increase mod. dimension
and mod. level at each
dimension
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
y
y
x
x
j
y
j
x
a
a
ea
ea
y
x
?
?
?
?
E
5DSP-enabled digital modulator
?/2
MZM1
MZM2
D/A converter
D/A converter
DSP
DSP
Arbitrary I-Q
modulation
Additional advantages:
1) Raised-cosine pulse shaping for better SE
2) Digital pre-equalization for better signal quality
3) Software reconfigurable modulation formats
6DSP-enabled coherent detection
X0?
Pol.
phase
diverse
hybrid
O/E
O/E
O/E
O/E
X90?
Y0?
Y90?
EX
EL
Signal
LO
A/D
IX
Qx
j hxx
Iy
Qy j
Clock
Recovery
hxy
hyx
hyy
EQ1
hx
hy
EQ2
x
y
A/D
A/D
A/D
DSP
Carrier
recovery
Carrier
recovery
Decision
Decision
Fast polarization tracking
PMD compensation
Fast Phase tracking
DSP algorithms not only allow the realization of coherent detection,
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