Transcript DSP for coherent detection: non

ONS kick-off meeting, Kista, 14 Apr. 2010
DSP algorithms for coherent detection
Marco Forzati
Acreo Netlab
13/04/2015
#1
A part of Swedish ICT Research AB
DSP for coherent detection: principle
Cromatic
Dispersion
compensation
13/04/2015
Carrier Phase
recovery
Polarization
Mode
Dispersion
compensation
#2
A part of Swedish ICT Research AB
DSP for coherent detection: linear equalisation
Numerical
simulations
13/04/2015
#3
A part of Swedish ICT Research AB
DSP for coherent detection: linear equalisation
Numerical
simulations
13/04/2015
#4
A part of Swedish ICT Research AB
DSP for coherent detection: non-linear equalisation
13/04/2015
#5
A part of Swedish ICT Research AB
DSP for coherent detection: non-linear equalisation
Linear compensation, adaptive CMA and
Viterbi-Viterbi
Experiment
(HHI
data)
“Lumped” non-linear compensation adaptive
CMA and Viterbi-Viterbi
13/04/2015
#6
A part of Swedish ICT Research AB
Challenge for DSP: non-linear cross-talk
7
OSNR PENALTY
6
3 SPANS (240 km)
PMD Equalizer
43 Gb/s
DB
5
112 Gb/s
PDM-QPSK
10.7 Gb/s
NRZ OOK 10.7 Gb/s
DB
4
3
Single
Channel
43 Gb/s
DQPSK
2
1
0
-2
0
2
4
6
Launch Power (dBm)
13/04/2015
#7
A part of Swedish ICT Research AB
8
PolMux-QPSK: quadrature phase and polarisation
multiplexing: 4 bits per transmitted symbol
Transmission using coherent
detection and DSP-aided
equalisation of linear and
non-linear impairments
2) Non-linear cross-talk: study of polarisation issues
5.0
4.5
OSNR penalty
4.0
3.5
3.0
2.5
2.0
1.5
0°
13/04/2015
45
°
Relative polarisation
angle
90°
#9
A part of Swedish ICT Research AB
3) Linear compensation: algorithms comparison
Numerical
simulations
13/04/2015
# 10
A part of Swedish ICT Research AB
3) Non-linear compensation, SPM and XPolM
Linear compensation, with FFT-based
compensation, 25 tap adaptive CMA and
Viterbi-Viterbi
Experiment
(Politecnico
di Torino
data)
“Lumped” non-linear compensation (FFT-based
CD and non-linear phase compensation at each
loop), 25 tap adaptive CMA and Viterbi-Viterbi
13/04/2015
# 11
A part of Swedish ICT Research AB