Optical transmission systems - Hochfrequenztechnik-Photonics - TU ...
Optical transmission systems - Hochfrequenztechnik-Photonics - TU ...
Optical transmission systems - Hochfrequenztechnik-Photonics - TU ...
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Berlin University of Technology<br />
High-Frequency Engineering / <strong>Photonics</strong><br />
K. Petermann<br />
petermann@tu-berlin.de<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Where we are located...<br />
High-Frequency Engineering<br />
.<br />
Electrical Engineering<br />
.<br />
Technical Acoustics<br />
High Voltage Technology<br />
Aeronautics & Astronoutics<br />
Chemical Engineering<br />
Main Building<br />
Mathematics<br />
Hydraulic Engineering<br />
Chemistry<br />
Architecture<br />
Geosciences<br />
Humanities<br />
Planning Sciences<br />
Physics<br />
Thermodynamics<br />
Mining<br />
Cafeteria<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
About the structure of the university...<br />
I<br />
II<br />
III<br />
IV<br />
V<br />
VI<br />
VII<br />
Humanities<br />
Mathematics and Natural Sciences<br />
Process Sciences<br />
Electrical Engineering and Computer Science<br />
Mechanical Engineering and Transport Systems<br />
Civil Engineering and Applied Geosciences<br />
Architecture - Environment - Society<br />
Economics and Management<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
IV: Electrical engineering and Computer science<br />
• Institute for Energy and Automation Technology<br />
• Institute for High Frequency- and Semiconductor System<br />
Technologies<br />
• Institute for Telecommunication Systems<br />
• Institute for Computer-Engineering and Microelectronics<br />
• Institute for Software Engineering and Theoretical Computer Science<br />
• Institute for Commercial Information Technology and Quantitative<br />
Methods<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Institute for High-Frequency and<br />
Semiconductor System Technologies<br />
• Semiconductor devices :<br />
• <strong>Photonics</strong>:<br />
• Electromagnetic compatibility:<br />
• Microwave technology:<br />
• Centre of advanced packaging:<br />
• Optoelectronics:<br />
Prof. Boit<br />
Prof. Petermann<br />
Prof. Mönich<br />
Prof. Böck<br />
Prof. Reichl (IZM)<br />
Prof. Tränkle (FBH)<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
<strong>Photonics</strong>, Prof. Petermann<br />
• Staff<br />
–Research staff: 15 people (12 PhD Students)<br />
–Technical staff: 6 people<br />
–Administration: 1 person<br />
• Research Areas<br />
–<strong>Optical</strong> <strong>transmission</strong> <strong>systems</strong><br />
–Electronic mitigation of propagation effects<br />
–Orthogonal frequency-division multiplex (OFDM)<br />
–All-optical signal processing<br />
–SoI Motherboard technology for hybrid integration<br />
–<strong>Optical</strong> and fibre sensors<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
<strong>Optical</strong> <strong>transmission</strong> <strong>systems</strong><br />
• General assessment of non-linear properties<br />
–Description of non-linear interaction in frequency<br />
domain<br />
–Easy comparison of different <strong>transmission</strong> <strong>systems</strong><br />
–Independent of number of spans, dispersion map etc.<br />
• Dispersion management for cross-phase modulation<br />
(XPM) suppression in 10 Gb/s <strong>systems</strong><br />
–Design rules for dispersion management<br />
• Interplay between polarisation-mode dispersion (PMD)<br />
and nonlinear effects<br />
–Properties of PMD statistics in presence of nonlinearities<br />
–Influence on PMD compensation<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
General assessment of non-linear properties<br />
Tx<br />
...<br />
N spans<br />
Rx<br />
Tx<br />
Rx<br />
Equivalent single-span system<br />
with similar properties<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Electronic mitigation of propagation effects<br />
• Suppression of non-linear effects by pre-distortion in<br />
40 Gb/s <strong>transmission</strong> <strong>systems</strong><br />
–<strong>Optical</strong> modulation of amplitude and phase at the<br />
transmitter<br />
–Design for low complexity of electronics<br />
• Electronic pre-distortion of directly modulated lasers in<br />
10 Gb/s NRZ <strong>transmission</strong> w/o optical dispersion<br />
compensation<br />
–Compensation of dispersion and non-linear transfer<br />
function of directly modulated laser<br />
–No inline dispersion compensation needed<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Pre-distortion in 40 Gb/s <strong>transmission</strong> <strong>systems</strong><br />
Data<br />
01100...<br />
Target<br />
format<br />
Link<br />
length<br />
Digital<br />
Electronic<br />
pre-distortion<br />
e.g. Look-up<br />
table<br />
D/A<br />
D/A<br />
Sample, e.g.<br />
I component<br />
CW Laser<br />
D acc<br />
Vector<br />
modulator<br />
Sample, e.g.<br />
Q component<br />
SSMF<br />
DCF<br />
OA<br />
Transmission link:<br />
100% fully post-<br />
Compensated spans<br />
Direct<br />
detection<br />
Sent signal at<br />
transmitter:<br />
Received<br />
signal:<br />
• Control of I and Q component at the transmitter<br />
• No coherent detection needed<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Pre-distortion with directly modulated laser<br />
PRBS<br />
Electr. Dispersion<br />
compensation<br />
1 st order 2 nd order 3 rd order<br />
<strong>transmission</strong> length [km]<br />
time [s]<br />
• Input electrical NRZ sequence is pre-distorted for EDC<br />
• Chirp of DML for amplitude and phase control<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Orthogonal frequency-division multiplex (OFDM)<br />
• Investigation of direct-detection <strong>systems</strong><br />
–influence of linear and non-linear effects<br />
• spectrally efficient techniques<br />
–compatible single sideband (cSSB)<br />
• System assessment<br />
!!!!!!!!!!!!!"#$ $ $ $ $ $ $%"#$<br />
! !!<br />
"#$%!&!!"#$%&"'()*+!(,-(*.!(/(01 23 (4"&5$5(67(89&(,:(9;-%7?(5@5-"A($5%:B(,(B,;(C"-D"":(
All-optical signal processing<br />
• Wavelength conversion of phase-modulated optical<br />
signals based on<br />
–Cross-phase modulation (XPM)<br />
–Four-wave mixing (FWM)<br />
• 2R & 3R Regeneration<br />
• Investigated non-linear media<br />
–Highly non-linear fibres (HNLF)<br />
–Semiconductor optical amplifiers (SOA)<br />
–Ultra-long SOAs<br />
–Quantum-dot SOAs<br />
• Co-operation with Heinrich-Hertz institute<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
3R regenerator for DPSK signals<br />
• Phase-to-amplitude conversion by delay-line<br />
interferometer (DLI)<br />
• Phase modulation (PM) of clock pulses from clock recovery<br />
(CR) via XPM<br />
• Wavelength conversion from λ 1 to λ 2<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Silicon-on-insulator technology<br />
• <strong>Optical</strong> components<br />
–Wave-guides<br />
–Arrayed wave-guide gratings (AWG)<br />
–Delay-line interferometers<br />
• Board technology for hybrid integration<br />
–Multi-wavelength transmitter<br />
• D(Q)PSK receiver board<br />
• Active and tuneable micro-photonic <strong>systems</strong><br />
–DFG research group<br />
–Collaboration with <strong>TU</strong> Hamburg-Harburg<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
SOI motherboard technology<br />
Multi-λ<br />
receiver<br />
l 1<br />
l 2<br />
l 3<br />
l 4<br />
source<br />
DtMulti-λ<br />
SOI motherboard<br />
technology<br />
SOA interferometric<br />
switch<br />
OTDM<br />
components<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Silicon as material for lightwave technology<br />
• Use of silicon for photonics because of:<br />
– Very good optical properties of silicon, low losses<br />
– Tuneability (thermo-optic effect, carrier injection)<br />
– High index material, compact components<br />
– Extremely well studied material, well known processing<br />
– Compatible with CMOS processes<br />
– Large area wafer, high quality material<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong> 17
Passive optical components<br />
W = 3.2 µm<br />
H = 4.0 µm<br />
h = 2.0 µm<br />
SiO 2 = 1.0 µm<br />
Rib wave-guides<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong> 18
Passive optical components: AWGs<br />
C-WDM AWG:<br />
Layout<br />
C-WDM AWG:<br />
Performance<br />
Loss [dB]<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Wavelength [nm] [nm]<br />
Fachgebiet <strong>Hochfrequenztechnik</strong> 19
Hybrid integration<br />
active components,<br />
flip-chip laser<br />
optical integration,<br />
wave-guide facets<br />
wave-guides, passive components<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
C-WDM transmitter board: Silicon-based solution<br />
DFBs<br />
λ1<br />
λ2 λ3 λ4<br />
AWG<br />
Overview of the SOI-based<br />
C-WDM transmitter chip<br />
Output spectrum of the SOI<br />
transmitter board.<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
<strong>Optical</strong> and fibre sensors<br />
• Electro-optical RF field probe<br />
–small and compact<br />
–high linearity<br />
• Strain and temperature sensor based on Brillouin effect<br />
–distributed measurement along several 100m<br />
• Plastic optical fibre (POF) sensors<br />
–<strong>Optical</strong> time-domain reflectometry (OTDR)<br />
–distributed measurement along several 10m<br />
–robust technique<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Electro-optical RF E-field probe<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
Planned and future activites<br />
(see also www-hft.ee.tu-berlin.de)<br />
• System and signal properties in the presence of predistortion<br />
and equalisation<br />
• System and signal properties in coherent <strong>transmission</strong><br />
<strong>systems</strong> applying higher-order modulation formats<br />
• Coherent OFDM <strong>systems</strong><br />
• Components for signal processing in SoI technology<br />
• Guidelines for network and system design<br />
TECHNISCHE<br />
UNIVERSITÄT<br />
BERLIN<br />
Fachgebiet <strong>Hochfrequenztechnik</strong>
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