Berlin University of Technology. High-Frequency Engineering / Photonics

Transcription

1 Berlin University of Technology High-Frequency Engineering / Photonics K. Petermann petermann@tu-berlin.de

2 Where we are located... 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 About the structure of the university... 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: Optoelectronics: Prof. Boit Prof. Petermann Prof. Mönich Prof. Böck Prof. Reichl (IZM) Prof. Tränkle (FBH)

6 Photonics, Prof. Petermann Staff Research staff: 15 people (12 PhD Students) Technical staff: 6 people Administration: 1 person Research Areas Optical transmission systems Electronic mitigation of propagation effects Orthogonal frequency-division multiplex (OFDM) All-optical signal processing SoI Motherboard technology for hybrid integration Optical and fibre sensors

7 Optical transmission systems General assessment of non-linear properties Description of non-linear interaction in frequency domain Easy comparison of different transmission systems 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

8 General assessment of non-linear properties Tx... N spans Rx Tx Rx Equivalent single-span system with similar properties

9 Electronic mitigation of propagation effects Suppression of non-linear effects by pre-distortion in 40 Gb/s transmission systems Optical modulation of amplitude and phase at the transmitter Design for low complexity of electronics Electronic pre-distortion of directly modulated lasers in 10 Gb/s NRZ transmission w/o optical dispersion compensation Compensation of dispersion and non-linear transfer function of directly modulated laser No inline dispersion compensation needed

10 Pre-distortion in 40 Gb/s transmission systems Data Target format Link length Digital Electronic pre-distortion e.g. Look-up table D/A D/A Sample, e.g. I component CW Laser D acc Vector modulator Sample, e.g. Q component SSMF DCF OA Transmission link: 100% fully post- Compensated spans Direct detection Sent signal at transmitter: Received signal: Control of I and Q component at the transmitter No coherent detection needed

11 Pre-distortion with directly modulated laser PRBS Electr. Dispersion compensation 1 st order 2 nd order 3 rd order transmission length [km] time [s] Input electrical NRZ sequence is pre-distorted for EDC Chirp of DML for amplitude and phase control

12 Orthogonal frequency-division multiplex (OFDM) Investigation of direct-detection systems influence of linear and non-linear effects spectrally efficient techniques compatible single sideband (cssb) System assessment!!!!!!!!!!!!"#$ $ $ $ $ $ $%"#$!!! 23 Comparison regarding dispersion tolerance of conventional optical OFDM (a) vs. compatible single side band technique (b). 12

13 All-optical signal processing Wavelength conversion of phase-modulated optical signals based on Cross-phase modulation (XPM) Four-wave mixing (FWM) 2R & 3R Regeneration Investigated non-linear media Highly non-linear fibres (HNLF) Semiconductor optical amplifiers (SOA) Ultra-long SOAs Quantum-dot SOAs Co-operation with Heinrich-Hertz institute

14 3R regenerator for DPSK signals Phase-to-amplitude conversion by delay-line interferometer (DLI) Phase modulation (PM) of clock pulses from clock recovery (CR) via XPM Wavelength conversion from λ 1 to λ 2

15 Silicon-on-insulator technology Optical components Wave-guides Arrayed wave-guide gratings (AWG) Delay-line interferometers Board technology for hybrid integration Multi-wavelength transmitter D(Q)PSK receiver board Active and tuneable micro-photonic systems DFG research group Collaboration with TU Hamburg-Harburg

16 SOI motherboard technology Multi-λ receiver l 1 l 2 l 3 l 4 Multi-λ source SOI motherboard technology Dt SOA interferometric switch OTDM components

17 Silicon as material for lightwave technology Use of silicon for photonics because of: Very good optical properties of silicon, low losses Tuneability (thermo-optic effect, carrier injection) High index material, compact components Extremely well studied material, well known processing Compatible with CMOS processes Large area wafer, high quality material 17

18 Passive optical components W = 3.2 µm H = 4.0 µm h = 2.0 µm SiO 2 = 1.0 µm Rib wave-guides 18

19 Passive optical components: AWGs C-WDM AWG: Layout C-WDM AWG: Performance Loss [db] Wavelength [nm] [nm] 19

20 Hybrid integration active components, flip-chip laser optical integration, wave-guide facets wave-guides, passive components

21 C-WDM transmitter board: Silicon-based solution DFBs λ1 λ2 λ3 λ4 AWG Overview of the SOI-based C-WDM transmitter chip Output spectrum of the SOI transmitter board.

22 Optical and fibre sensors Electro-optical RF field probe small and compact high linearity Strain and temperature sensor based on Brillouin effect distributed measurement along several 100m Plastic optical fibre (POF) sensors Optical time-domain reflectometry (OTDR) distributed measurement along several 10m robust technique

23 Electro-optical RF E-field probe

24 Planned and future activites (see also www-hft.ee.tu-berlin.de) System and signal properties in the presence of predistortion and equalisation System and signal properties in coherent transmission systems applying higher-order modulation formats Coherent OFDM systems Components for signal processing in SoI technology Guidelines for network and system design