SOFI
WP#2: Simulation plans and progress
Networks and Optical Communications group – NOC
1
NOC group - AIT
www.ait.edu.gr
SOFI
Outline
• Target WP#2 simulation and experiment plans as per deliverable
D2.1
• Current activities and publication plan
Subcarrier generation for optical OFDM
– Simulation of 100 Gb/s Duobinary-OFDM system
Simulation of 56Gb/s Co-QPSK system
– System degradation due to coherent cross-talk in oADM system
configuration
• Future simulation and experimental plan
• Expenses
2
NOC group - AIT
www.ait.edu.gr
SOFI
Target simulation and
experimental plan
Simulation plan @D2.1:
•
•
•
•
QPSK transmission at 56 Gbit/s and digital coherent detection
DP-QPSK transmission at 112 Gbit/s and digital coherent detection
Multi-channel (4) QPSK-OFDM transmission
If possible simulation of nonlinear optical signal processing using SOH device
• Polarization rotation based optical switching
• FWM enhancement under electrical filed
Simulation platform:
• VPI
• R-SOFT
• MATLAB
Experimental plan:
• Experiments will be performed using SOFI-device at KIT based on simulation
results @ measured characteristics
3
NOC group - AIT
www.ait.edu.gr
SOFI
Current simulation activities
Current activities:
• QPSK transmission at 56 Gbit/s and digital coherent
detection
System performance optimization
Impact of coherent cross talk [Publication target OFC’11]
Dual polarization multiplexing for 112 Gbit/s data transmission
• Optical OFDM transmission
Subcarrier generation [Publication target OFC’11]
OFFT filtering and direct detection
Single channel 100 Gbit/s Duobinary-oOFDM [Publication target OFC’11]
Dual polarization multiplexing for 200 Gbit/s data transmission
Mutli-channel Duobinary oOFDM
4
NOC group - AIT
www.ait.edu.gr
SOFI
Activity#1
Tx: 100 Gbit/s Duobinary-OFDM
12.5 Gb/s
 Data rates 100 Gbit/s
 No of subcarrier = 8
 Symbol rate = 12.5 Gbaud/s
 Channel spacing = 100 GHz
 Spectral efficiency (b/s/Hz) = 1
100 Gb/s OFDM signal
0.01 nm@RBW
0.01 nm@RBW
5
NOC group - AIT
www.ait.edu.gr
SOFI
Rx: 100 Gb/s Duobinary OFDM
Fiber span 40 km
After 3x 40 km
0.01 nm@RBW
•
•
6
Subcarrier data signals are separated by OFFT
Peak to average ratio is very large, which need to be minimized within ± 2dB
• System optimization is underway
NOC group - AIT
www.ait.edu.gr
SOFI
Initial Result:
100 Gbit/s Duobinary-OFDM
Fiber Length [km]
• This is initial result and system optimization is in progress
• Possible to transmit signal up to 100 km fiber without using any
dispersion compensating elements
7
NOC group - AIT
www.ait.edu.gr
SOFI
Activity#2
56 Gbit/s QPSK transmission
 Data rates: 56 Gbit/s
 Symbol rate = 28 Gbaud/s
 Channel spacing = 50 - 25 GHz
 Spectral efficiency (b/s/Hz) = 1 - 2
28Gs/s
56 Gbit/s
28Gs/s
8
NOC group - AIT
www.ait.edu.gr
SOFI
9
NOC group - AIT
Digital Coherent Receiver
For 56 Gbit/s QPSK
www.ait.edu.gr
SOFI

The input signals are processed by custom digital signal processing (DSP)
procedures
•
•
•
•
•

10
VPI-DSP module
Linear & nonlinear distortion
compensation mechanism
Digital filtering equalization
Carrier phase correction
Chromatic Dispersion Compensation
PMD Compensation
Nonlinear Phase Noise Mitigation
Symbol Error Rate calculation using Monte-Carlo approach
NOC group - AIT
www.ait.edu.gr
Initial Result:
56 Gbit/s QPSK transmission
SOFI
-4
 Bit rate : 56 Gbit/s = 2x 28 Gs/s
Linewidth Tx and LO : 100 kHz
 Tx optical power : 10 dBm
 Number of taps for CD compensation: 15
Log (SER)
-5
-6
B2B without DSP
B2B with DSP
-7
7 km Fiber without DSP
-8
7km fiber with DSP
20km with DSP
-9
-10
-11
-12
-42
50km with DSP
-37
-32
-27
-22
Received Optical Power (dBm)
• DSP module is needed for fiber length > 7 km
• Possible to transmit signal > 50 km fiber using DSP [ This is primarily
result obtained, system optimization is in progress]
11
NOC group - AIT
www.ait.edu.gr
SOFI
Future plan
Simulation studies and experiments
•
•
•
•
DP-QPSK transmission at 112 Gbit/s and digital coherent detection
Multi-channel QPSK-OFDM transmission
DP-duobinary-OFDM transmission at 200 Gbit/s
Multi-channel OFDM systems
100 Gbit/s ( 8-subcarirer-Duobinary-OFDM)
200 Gbit/s ( DP-8-subcarrier-duobinary-OFDM)
12
NOC group - AIT
www.ait.edu.gr
SOFI
Expenses
Total Costs
Cost Category
13
NOC group - AIT
QMR-1
QMR-2
Personnel (MGT)
1750.00 €
1167.00 €
Personnel (RTD)
6750.00 €
8100.00 €
Consumables
-
-
Equipment
-
-
Travel
717.00 €
- not available
Indirect Costs (on MGT PM)
1400.00 €
934.00 €
Indirect Costs (on RTD PM)
5400.00 €
6480.00 €
Total
16017.00 €
16681.00 €
Total (EC contribution)
12800.25 €
13036..00 €
www.ait.edu.gr