High-Frequency Engineering / Photonics
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1 Technische Universität Berlin High-Frequency Engineering / Photonics K. Petermann petermann@tu-berlin.de
2 Main campus High-Frequency Engineering. Electrical Engineering. Technical Acoustics High Voltage Technology Aeronautics & Astronoutics Chemical Engineering Main Building Mathematics Hydraulic Engineering Chemistry Architecture Geosciences Humanities Planning Sciences Physics Thermodynamics Mining Cafeteria
3 Faculties I II III IV V VI VII Humanities Mathematics and Natural Sciences Process Sciences Electrical Engineering and Computer Science Mechanical Engineering and Transport Systems Civil Engineering and Applied Geosciences Architecture - Environment - Society Economics and Management
4 IV: Electrical engineering and Computer science Institute for Energy and Automation Technology Institute for High Frequency- and Semiconductor System Technologies Institute for Telecommunication Systems Institute for Computer-Engineering and Microelectronics Institute for Software Engineering and Theoretical Computer Science Institute for Commercial Information Technology and Quantitative Methods
5 Institute for High-Frequency and Semiconductor System Technologies Semiconductor devices : Photonics: Electromagnetic compatibility: Microwave technology: Centre of advanced packaging: Polymer Electronics: Optoelectronics: High Frequency Technology: Semiconductor Technology: Photovoltaic: Prof. Boit Prof. Petermann Prof. Mönich Prof. Böck Prof. Reichl (IZM) Prof. Bock (IZM) Prof. Tränkle (FBH) Prof. Heinrich (FBH) Prof. Tillack (IHP) Prof. Rech (HZB)
6 Photonics, Prof. Petermann Staff Research staff: 12 people (9 PhD Students) Technical staff: 6 people Administration: 1 person Research Areas Optical fiber transmission systems Electronic mitigation of propagation effects Design and modelling of optical sub-systems Integrated optics on silicon-on-insulator (SoI) technology Motherboard technology for hybrid integration Optical and fibre sensors
7 Optical fiber transmission systems General assessment of nonlinear properties Description of nonlinear interaction in frequency domain Comparison of different transmission systems possible Independent of number of spans, dispersion map etc. Dispersion management for cross-phase modulation (XPM) suppression in 10 Gb/s systems Design rules for dispersion management Interplay between polarisation-mode dispersion (PMD) and nonlinear effects Properties of PMD statistics in presence of nonlinearities Influence on PMD compensation Influence on polarization cross talk at the receiver
8 PMD and nonlinear effects (XPolM) 540 I Nonlinear depolarization induced by XPolM leads to significant penalties in PDM systems Interleaving both PDM sub-channels reduces polarization cross-talk due to XPolM Req. OSNR of PDM-DQPSK, filled symbols: Fig. 3. Mean probe channel ROSNR penalty (averaged over 100 iterations each) versus interferer power for single-polarization, aligned-subchannel PolDM, and numerical interleaved-subchannel results, PolDM open symbols: systems, as obtained theory byof numerical simulations nonlinear (filled symbols) depolarization and theory (open(xpolm) symbols). Long dashes denote extrapolation; short dashes denote interpolation. The back-to-back reference ROSNR for the penalty is 15.7 db (single-polarization) or 18.7 db (PolDM). Average DOP reduction (obtained from parallel single-polarization simulation) shown for reference. After being detected in an idealized coherent receiver, the 8
9 Electronic mitigation of propagation effects Suppression of (non)linear effects by pre-distortion in 40 Gb/s transmission systems (direct detection) System and signal properties in the presence of predistortion and equalization Influence of fiber nonlinearities on electronic predistortion systems at 10 and 40 Gb/s Electronic pre-distortion of directly modulated lasers in 10 Gb/s NRZ transmission w/o optical dispersion compensation Compensation of dispersion and nonlinear transfer function of directly modulated laser No inline dispersion compensation needed
10 Pre-distortion in 40 Gb/s transmission systems... EPD TX 80 km SSMF EDFA EPD TX DD RX EPD TX x elec. predistorted WDM system In a realistic transmission scenario at 40 Gb/s, electronical and optical dispersion compensation shows similar performance!
11 Pre-distortion with directly modulated laser Artificial neural networks for electronic pre-compensation Uses FM-AM conversion for transmission distances up to 350 km with a directly modulate laser
12 Coherent Mode division multiplexing (MDM) Improvement of transmission capacity due to use of additional eigenmodes in multimode fibers Principle Modes in MMF are frequency independent in 1. order and may be used to achieve high data rate mode division multiplexing 12
13 Modelling and design of optical sub-systems Modelling of (quantum dot) semiconductor optical amplifiers (SOA) for all-optical signal processing Add-drop multiplexing Wavelength conversion Regeneration Analysis of pump induced signal noise Highly nonlinear fibers (HNLF) for all-optical signal processing
14 All-optical wavelength conversion HNLF High performance solution (high conversion efficiency, low noise figure, full tunability) Strong impact of phase distortions SOA Low cost component yields low performance (low conversion efficiency and moderate output OSNR) Strong impact of phase distortions System impact of cascaded wavelength conversion Cooperation with Tsinghua-University (Beijing, China) and HHI (Berlin, Germany) 14
15 Silicon-on-insulator technology Optical components Waveguides Arrayed-waveguide gratings (AWG) Delay-line interferometers Board technology for hybrid integration Multi-wavelength transmitter D(Q)PSK receiver board Tunable dispersion compensation Active and tunable micro-photonic systems DFG research group Collaboration with TU Hamburg-Harburg
16 Silicon as material for lightwave technology Use of silicon for photonics because of: Very good optical properties of silicon, low losses Tunability (thermo optic effect, carrier injection) High index material, compact components Extremly well studied material, well known processing Compatible with CMOS processes Large area wafer, high quality material 16
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19 Electro - optical RF E-field probe
20 Further activites (see also www-hft.ee.tu-berlin.de) Orthogonal frequency-division multiplex (OFDM) for robust and efficient optical transmission All-optical signal processing based on quantum-dot semiconductor optical amplifiers
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