Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.
2017Electrical energy storage by a magnesium-copper-sulfide rechargeable battery
Thiele, Philipp; Neumann, Johannes; Westphal, Anne; Ludwig, Ralf; Bonsa, Anne- Marie; Appelhagen, Andreas; Malcher, Peter; Köckerling, Martin
Journal Article
2014Carboxylated or aminated polyaniline - multiwalled carbon nanotubes nanohybrids for immobilization of cellobiose dehydrogenase on gold electrodes
Tanne, J.; Kracher, D.; Dietzel, B.; Schulz, B.; Ludwig, R.; Lisdat, F.; Scheller, F.W.; Bier, F.F.
Journal Article
2014Third generation ATP sensor with enzymatic analyte recycling
Yarman, Aysu; Schulz, Christopher; Sygmund, Christoph; Ludwig, Roland; Gorton, L.; Wollenberger, Ulla; Scheller, Frieder W.
Journal Article
2013Comparison of force fields on the basis of various model approaches - how to design the best model for the [CnMIM][NTf2] family of ionic liquids
Köddermann, T.; Reith, D.; Ludwig, R.
Journal Article
2012All-optical data frequency multiplexing on single-wavelength carrier light by sequentially provided cross-phase modulation in fiber
Watanabe, S.; Kato, T.; Okabe, R.; Elschner, R.; Ludwig, R.; Schubert, C.
Journal Article
2012Beyond 100G - high-capacity transport technologies for next generation optical core networks
Fischer, J.K.; Nölle, M.; Molle, L.; Schmidt-Langhorst, C.; Hilt, J.; Ludwig, R.
Conference Paper
2012Black-box phase-sensitive fiber-optic parametric amplifier assisted by a semiconductor optical amplifier
Richter, T.; Meuer, C.; Ludwig, R.; Schubert, C.
Conference Paper
2012The effect of neutral ion aggregate formation on the electrical conductivity of an ionic liquid and its mixtures with chloroform
Köddermann, T.; Klembt, S.; Klasen, D.; Paschek, D.; Kragl, U.; Ludwig, R.
Journal Article
2012OTDM-to-WDM conversion of complex modulation formats by time-domain optical Fourier transformation
Palushani, E.; Richter, T.; Ludwig, R.; Schubert, C.; Mulvad, H.C.H.; Clausen, A.T.; Oxenlowe, L.K.
Conference Paper
2012Transmission of single-channel 16-QAM data signals at terabaud symbol rates
Richter, T.; Palushani, E.; Schmidt-Langhorst, C.; Ludwig, R.; Molle, L.; Nölle, M.; Schubert, C.
Journal Article
201112-Stage sequential optical FDM of 120 Gb/s (12x10 Gb/s) data in 240-GHz bandwidth using fiber cross-phase modulation with optical subcarrier signals
Kato, T.; Okabe, R.; Ludwig, R.; Elschner, R.; Schubert, C.; Watanabe, S.
Conference Paper
20118 × 448-Gb/s WDM transmission of 56-GBd PDM 16-QAM OTDM signals over 250-km ultralarge effective area fiber
Fischer, J.K.; Molle, L.; Nölle, M.; Schmidt-Langhorst, C.; Hilt, J.; Ludwig, R.; Peckham, D.W.; Schubert, C.
Journal Article
2011All-optical THz-band frequency multiplexing on a single optical carrier using fiber cross-phase modulation
Kato, T.; Okabe, R.; Ludwig, R.; Schmidt-Langhorst, C.; Schubert, C.; Watanabe, S.
Conference Paper
2011Characterization of an integrated coherent receiver for 224 Gb/s polarization multiplexed 16-QAM transmission
Matiss, A.; Nölle, M.; Fischer, J.K.; Leonhardt, C.C.; Ludwig, R.; Hilt, J.; Molle, L.; Schmidt-Langhorst, C.; Schubert, C.
Conference Paper
2011Coherent detection using parallel optical sampling
Fischer, J.K.; Ludwig, R.; Molle, L.; Schmidt-Langhorst, C.; Leonhardt, C.C.; Matiss, A.; Schubert, C.
Conference Paper
2011Coherent receiver for 100G Ethernet applications based on polymer planar lightwave circuit
Kroh, M.; Wang, J.; Theurer, A.; Zawadzki, C.; Schmidt, D.; Ludwig, R.; Lauermann, M.; Beling, A.; Matiss, A.; Schubert, C.; Steffan, A.; Keil, N.; Grote, N.
Conference Paper
2011Dual-quadrature coherent receiver for 100G Ethernet applications based on polymer planar lightwave circuit
Wang, J.; Kroh, M.; Theurer, A.; Zawadzki, C.; Schmidt, D.; Ludwig, R.; Lauermann, M.; Zhang, Z.Y.; Beling, A.; Matiss, A.; Schubert, C.; Steffan, A.; Keil, N.; Grote, N.
Journal Article
2011High-speed digital coherent receiver based on parallel optical sampling
Fischer, J.K.; Ludwig, R.; Molle, L.; Schmidt-Langhorst, C.; Leonhardt, C.C.; Matiss, A.; Schubert, C.
Journal Article
2011Higher-order modulation formats for spectral-efficient high-speed metro systems
Freund, R.; Nölle, M.; Seimetz, M.; Hilt, J.; Fischer, J.; Ludwig, R.; Schubert, C.; Bach, H.-G.; Velthaus, K.-O.; Schell, M.
Conference Paper
2011Integrated Coherent Receiver Modules for 100G Ethernet and Beyond
Fischer, J.K.; Ludwig, R.; Molle, L.; Nölle, M.; Beling, A.; Leonhardt, C.C.; Matiss, A.; Umbach, A.; Kunkel, R.; Bach, H.-G.; Schubert, C.
Conference Paper
2011Integrated receivers on silicon-on-insulator for advanced modulation formats
Kroh, M.; Zimmermann, L.; Bach, H.-G.; Voigt, K.; Beling, A.; Nielsen, M.L.; Ludwig, R.; Bruns, J.; Unterbörsch, G.
Journal Article
2011Multi-stage optical FDM of 12-channel 10-Gb/s data with 20-GHz exact channel spacing using fiber cross-phase modulation with optical subcarrier signals
Kato, T.; Okabe, R.; Ludwig, R.; Elschner, R.; Schubert, C.; Watanabe, S.
Journal Article
2011Performance of an integrated coherent receiver module for up to 160G DP-QPSK transmission systems
Matiss, A.; Bottacchi, S.; Fischer, J.K.; Ludwig, R.; Leonhardt, C.C.; Schmidt-Langhorst, C.; Schubert, C.
Journal Article
2011Polarization-insensitive 320-Gb/s in-line all-optical wavelength conversion in a 320-km transmission span
Hu, H.; Nouroozi, R.; Ludwig, R.; Schmidt-Langhorst, C.; Suche, H.; Sohler, W.; Schubert, C.
Journal Article
2011Simultaneous polarization-insensitive wavelength conversion of 80-Gb/s RZ-DQPSK signal and 40-Gb/s RZ-OOK signal in a Ti:PPLN waveguide
Hu, H.; Nouroozi, R.; Ludwig, R.; Huttl, B.; Schmidt-Langhorst, C.; Suche, H.; Sohler, W.; Schubert, C.
Journal Article
2011Single wavelength channel 10.2 Tb/s TDM-data capacity using 16-QAM and coherent detection
Richter, T.; Palushani, E.; Schmidt-Langhorst, C.; Nölle, M.; Ludwig, R.; Fischer, J.K.; Schubert, C.
Conference Paper
2011Transmission of a Serial 5.1-Tb/s Data Signal Using 16-QAM and Coherent Detection
Palushani, E.; Schmidt-Langhorst, C.; Richter, T.; Nölle, M.; Ludwig, R.; Schubert, C.
Conference Paper
2011Ultrafast transmission systems using coherent technology
Ludwig, R.; Richter, T.; Palushani, E.; Schmidt-Langhorst, C.; Molle, L.; Fischer, J.K.; Noelle, M.; Elschner, R.; Schubert, C.
Conference Paper
2010110 km transmission of 160 Gbit/s RZ-DQPSK signals by midspan polarization-insensitive optical phase conjugation in a Ti:PPLN waveguide
Hu, H.; Nouroozi, R.; Ludwig, R.; Schmidt-Langhorst, C.; Suche, H.; Sohler, W.; Schubert, C.
Journal Article
201080 Gb/s multi-wavelength booster amplification in an InGaAs/GaAs quantum-dot semiconductor optical amplifier
Schmidt-Langhorst, C.; Meuer, C.; Galperin, A.; Schmeckebier, H.; Ludwig, R.; Puris, D.; Bimberg, D.; Petermann, K.; Schubert, C.
Conference Paper
2010All-optical level equalization of data packets using a fiber-optic parametric amplifier
Richter, T.; Ludwig, R.; Fischer, J.K.; Watanabe, S.; Okabe, R.; Kato, T.; Schubert, C.
Conference Paper
2010Digital coherent receiver based on parallel optical sampling
Fischer, J.K.; Ludwig, R.; Molle, L.; Schmidt-Langhorst, C.; Leonhardt, C.C.; Matiss, A.; Schubert, C.
Conference Paper
2010High spectral efficient phase and quadrature amplitude modulation for optical fibre transmission
Freund, R.; Hilt, J.; Nölle, M.; Molle, L.; Seimetz, M.; Fischer, J.K.; Ludwig, R.; Schmidt-Langhorst, C.; Schubert, C.
Conference Paper
2010High-speed digital coherent receiver with parallel optical sampling
Fischer, J.K.; Ludwig, R.; Molle, L.; Schmidt-Langhorst, C.; Galperin, A.; Richter, T.; Leonhardt, C.C.; Matiss, A.; Schubert, C.
Conference Paper
2010InP-basierte elektrische und elektro-optische Komponenten für 112 Gb/s OOK Systeme
Schubert, C.; Makon, R.E.; Steffan, A.G.; Driad, R.; Bach, H.-G.; Mekonnen, G.G.; Zhang, R.; Ludwig, R.; Schmidt-Langhorst, C.
Conference Paper
2010Novel integrated coherent receiver module for 100 G serial transmission
Matiss, A.; Ludwig, R.; Fischer, J.-K.; Molle, L.; Schubert, C.; Leonhardt, C.C.; Bach, H.-G.; Kunkel, R.; Umbach, A.
Conference Paper
2010Performance of a novel integrated coherent receiver module for 100G ethernet applications and beyond
Ludwig, R.; Fischer, J.K.; Matiss, A.; Molle, L.; Leonhardt, C.C.; Bach, H.-G.; Kunkel, R.; Umbach, A.; Schubert, C.
Conference Paper
2010Polarization-insensitive all-optical wavelength conversion of 320 Gb/s RZ-DQPSK signals using a Ti:PPLN waveguide
Hu, H.; Nouroozi, R.; Ludwig, R.; Huettl, B.; Schmidt-Langhorst, C.; Suche, H.; Sohler, W.; Schubert, C.
Journal Article
2010Single- and multi-carrier techniques to build up Tb/s per channel transmission systems
Freund, R.; Nölle, M.; Schmidt-Langhorst, C.; Ludwig, R.; Schubert, C.; Bosco, G.; Carena, A.; Poggiolini, P.; Oxenlowe, L.K.; Galili, M.; Mulvad, H.C.H.; Winter, M.; Hillerkuss, D.; Schmogrow, R.; Freude, W.; Leuthold, J.; Ellis, A.D.; Gunning, F.C.G; Zhao, J.; Frascella, P.
Conference Paper
2010Small form factor dual balanced photoreceiver with sensitive peak-level detectors for 40 Gb/s DQPSK applications
Nielsen, M.L.; Honecker, J.; Jacob, A.; Bottacchi, S.; Ludwig, R.; Unterbörsch, G.; Umbach, A.
Conference Paper
2010Terabit/s single-carrier transmission based on coherent time-division demultiplexing
Schmidt-Langhorst, C.; Ludwig, R.; Molle, L.; Gross, D.D.; Freund, R.; Schubert, C.
Conference Paper
2010Terabit/s single-carrier transmission systems based on coherent time-division demultiplexing
Schmidt-Langhorst, C.; Ludwig, R.; Molle, L.; Groß, D.-D.; Freund, R.; Schubert, C.
Conference Paper
20091 Tb/s transmission on a single wavelength channel for future terabit ethernet
Schmidt-Langhorst, C.; Ludwig, R.; Hu, H.; Schubert, C.
Conference Paper
20091.28 Tb/s single wavelength star-16-QAM transmission over up to 800 m of graded-index multimode fibre
Freund, R.-E.; Gross, D.-D.; Ludwig, R.; Schmidt-Langhorst, C.
Conference Paper
2009107 Gb/s RZ-DQPSK signal transmission over 108 km SMF using optical phase conjugation in an SOA
Hu, H.; Han, L.; Ludwig, R.; Schmidt-Langhorst, C.; Yu, J.; Schubert, C.
Conference Paper
2009All-optical combination of DPSK and OOK to 320-Gb/s DQPSK signal using fiber-based signal processors
Futami, F.; Okabe, R.; Kato, T.; Schmidt-Langhorst, C.; Schubert, C.; Ludwig, R.; Watanabe, S.
Conference Paper
2009Characterization of an InP-based electrical 1:2 demultiplexer in a 107 Gb/s OOK system
Schubert, C.; Makon, R.E.; Steffan, A.G.; Driad, R.; Ludwig, R.; Schmidt-Langhorst, C.
Conference Paper
2009Coherent detection of a 50 Gb/s QPSK signal using an InP 90 deg hybrid monolithically integrated with balanced photodetectors
Ludwig, R.; Matiss, A; Bach, H.-G.; Molle, L.; Leonhardt, C.C.; Kunkel, R.; Schmidt, D.
Conference Paper
2009Demonstration of an InP-based electrical 1:2 demultiplexer in a 107 Gb/s OOK system
Schubert, C.; Makon, R.E.; Steffan, A.G.; Driad, R.; Ludwig, R.; Schmidt-Langhorst, C.
Conference Paper
2009Generation and coherent time-division demultiplexing of up to 5.1 Tb/s single-channel 8-PSK and 16-QAM signals
Schmidt-Langhorst, C.; Ludwig, R.; Gross, D.-D.; Molle, L.; Seimetz, M.; Freund, R.; Schubert, C.
Conference Paper
2009Hybrid integrated 40 Gb/s DPSK receiver on SOI
Kroh, M.; Unterbörsch, G.; Tsianos, G.; Ziegler, R.; Steffan, A.G.; Bach, H.-G.; Kreissl, J.; Kunkel, R.; Mekonnen, G.G.; Rehbein, W.; Schmidt, D.; Ludwig, R.; Petermann, K.; Bruns, J.; Mitze, T.; Voigt, K.; Zimmermann, L.
Conference Paper
2009Investigation of DGD and delay-line interferometer phase tolerance of integrated receiver module for 86 Gb/s NRZ-DQPSK modulation
Nielsen, M.L.; Steffan, A.G.; Tsianos, G.; Unterborsch, G.; Umbach, A.; Ludwig, R.; Boutin, A.; Fulop, L.; Verluise, F.
Conference Paper
2009Polarization insensitive all-optical wavelength conversion of 320 Gb/s RZ-DQPSK data signals
Hu, H.; Suche, H.; Ludwig, R.; Hüttl, B.; Schmidt-Langhorst, C.; Nouroozi, R.; Sohler, W.; Schubert, C.
Conference Paper
2009Polarization-independent all-optical amplitude limiter using two-stage gain-saturated fiber parametric amplifiers
Watanabe, S.; Futami, F.; Okabe, R.; Kato, T.; Ludwig, R.; Schmidt-Langhorst, C.; Schubert, C.
Conference Paper
2009Quantum-dot semiconductor optical booster amplifier with ultrafast gain recovery for pattern-effect free amplification of 80 Gb/s RZ-OOK data signals
Schmidt-Langhorst, C.; Meuer, C.; Ludwig, R.; Puris, D.; Bonk, R.; Vallaitis, T.; Bimberg, D.; Petermann, K.; Leuthold, J.; Schubert, C.
Conference Paper
2009Single-channel 1-Tb/s transmission over 480 km DMF for future terabit ethernet systems
Schmidt-Langhorst, C.; Ludwig, R.; Hu, H.; Schubert, C.
Conference Paper
2009Wavelength conversion and optical signal processing in PPLN waveguides
Sohler, W.; Buchter, D.; Gui, L.; Herrmann, H.; Hu, H.; Ludwig, R.; Nouroozi, R.; Quiring, V.; Ricken, R.; Schubert, C.; Suche, H.
Conference Paper
2009What far-infrared spectra can contribute to the development of force fields for ionic liquids used in molecular dynamics simulations
Köddermann, T.; Fumino, K.; Ludwig, R.; Canongia Lopes, J.N.; Padua, A.A.H.
Journal Article
2008107 Gb/s RZ-DPSK transmission over 320 km dispersion-managed fiber with balanced detection ETDM integrated receiver
Ludwig, R.; Hüttl, B.; Hu, H.; Schmidt-Langhorst, C.; Schubert, C.
Conference Paper
2008107 Gbit/s RZ-DPSK transmission using an EDTM integrated receiver
Schubert, C.; Ludwig, R.; Hüttl, B.; Hu, H.; Schmidt-Langhorst, C.
Conference Paper
200853.5 GHz monolithically integrated pulse source for 107 Gb/s RZ-DQPSK transmission
Schubert, C.; Ludwig, R.; Hüttl, B.; Kaiser, R.; Hu, H.; Steffan, A.; Schmidt-Langhorst, C.
Conference Paper
2008All-optical amplitude noise suppression of 107 Gb/s DPSK signals using a parametric fiber switch in a 320 km transmission experiment
Ludwig, R.; Futami, F.; Hüttl, B.; Schmidt-Langhorst, C.; Okabe, R.; Watanabe, S.; Schubert, C.
Conference Paper
2008All-optical wavelength conversion of 80 Gb/s RZ-DQPSK using four-wave mixing in a semiconductor optical amplifier
Han, L.; Hu, H.; Ludwig, R.; Schubert, C.; Zhang, H.
Conference Paper
2008Impact of pump-phase modulation on FWM-based wavelength conversion of D(Q)PSK signals
Elschner, R.; Bunge, C.-A.; Hüttl, B.; Gual i Coca, A.; Schmidt-Langhorst, C.; Ludwig, R.; Schubert, C.; Petermann, K.
Journal Article
2008Innovative clear barrier technology for the packaging industry
Schiller, N.; Straach, S.; Günther, S.; Alexandra, L.; Quiceno, G.; Contreras, A.G.; Ludwig, R.; Hoffmann, G.
Conference Paper
2008Eine innovative Technologie zur Herstellung von transparenten Barriereschichten für die Verpackungsindustrie
Schiller, N.; Straach, S.; Günther, S.; Ludwig, R.; Hoffmann, G.
Conference Paper
2008Linewidth investigation of monolithically integrated 40 GHz mode-locked laser diodes for high-speed RZ-DQPSK transmission
Hüttl, B.; Hu, H.; Ludwig, R.; Kaiser, R.; Schmidt-Langhorst, C.; Steffan, A.G.; Schubert, C.
Conference Paper
2008An optical parametric amplified fiber switch for optical signal processing and regeneration
Watanabe, S.; Futami, F.; Okabe, R.; Ludwig, R.; Schmidt-Langhorst, C.; Huettl, B.; Schubert, C.; Weber, H.G.
Journal Article
2008Phase-preserving 2R regeneration of a WDM RZ-DPSK signal using a nonlinear amplifying loop mirror
Cvecek, K.; Sponsel, K.; Stephan, C.; Onishchukov, G.; Ludwig, R.; Schubert, C.; Schmauss, B.; Leuchs, G.
Conference Paper
2008Phase-preserving amplitude regeneration for a WDM RZ-DPSK signal using a nonlinear amplifying loop mirror
Cvecek, K.; Sponsel, K.; Stephan, C.; Onishchukov, G.; Ludwig, R.; Schubert, C.; Schmauss, B.; Leuchs, G.
Journal Article
2008Ultra-high-speed OTDM transmission technology
Weber, H.-G.; Ludwig, R.
Book Article
2007100 Gb/s ETDM receivers
Ludwig, R.; Schubert, C.; Huettl, B.; Schmidt-Langhorst, C.; Derksen, R.H.; Moller, M.
Conference Paper
2007160 Gb/s RZ-DPSK OTDM-transmission over 480 km using 160 km repeater spans and advanced forward-error-correction
Ludwig, R.; Weisser, S.; Schmidt-Langhorst, C.; Raddatz, L.; Schubert, C.
Conference Paper
20072R-Regeneration of an 80-Gb/s RZ-DQPSK signal by a nonlinear amplifying loop mirror
Cvecek, K.; Sponsel, K.; Ludwig, R.; Schubert, C.; Stephan, C.; Onishchukov, G.; Schmauss, B.; Leuchs, G.
Journal Article
2007320 Gbit/s DQPSK all-optical wavelength conversion using four wave mixing
Galili, M.; Hüttl, B.; Schmidt-Langhorst, C.; Gual i Coca, A.; Ludwig, R.; Schubert, C.
Conference Paper
2007320 Gbit/s DQPSK all-optical wavelength conversion using periodically poled LiNbO3
Hüttl, B.; Gual i Coca, A.; Suche, H.; Ludwig, R.; Schmidt-Langhorst, C.; Weber, H.; Sohler, W.; Schubert, C.
Conference Paper
200760 Gbit/s RZ-DPSK OTDM-transmission over 480 km using 160 km repeater spans
Schubert, C.; Ludwig, R.; Weisser, S.; Schmidt-Langhorst, C.; Raddatz, L.
Conference Paper
2007All-optical amplitude noise suppression of 160-Gb/s OOK and DPSK data signals using a parametric fiber switch
Futami, F.; Okabe, R.; Ono, S.; Watanabe, S.; Ludwig, R.; Schmidt-Langhorst, C.; Schubert, C.
Conference Paper
2007All-optical combination of DPSK and OOK to 160 Gbit/s DQPSK data signals
Galili, M.; Schmidt-Langhorst, C.; Ludwig, R.; Futami, F.; Watanabe, S.; Schubert, C.
Conference Paper
2007All-optical wavelength converter concepts for high data rate D(Q)PSK transmission
Hüttl, B.; Elschner, R.; Suche, H.; Gual i Coca, A.; Bunge, C.-A.; Schmidt-Langhorst, C.; Ludwig, R.; Nouroozi, R.; Weber, H.G.; Petermann, K.; Sohler, W.; Schubert, C.
Conference Paper
2007Geschwindigkeitsrekord auf der Datenautobahn
Schmidt-Langhorst, C.; Schubert, C.; Ludwig, R.; Weber, H.G.
Journal Article
2007Integrated 100-Gb/s ETDM receiver
Schubert, C.; Derksen, R.H.; Moller, M.; Ludwig, R.; Weiske, C.-J.; Lutz, J.; Ferber, S.; Kirstadter, A.; Lehmann, G.; Schmidt-Langhorst, C.
Journal Article
2007Optimization of SBS-suppression for 320 Gbit/s DQPSK all-optical wavelength conversion
Hüttl, B.; Gual i Coca, A.; Elschner, R.; Bunge, C.-A.; Petermann, K.; Schmidt-Langhorst, C.; Ludwig, R.; Schubert, C.
Conference Paper
2007Optische Zeitmultiplex-Technik für 160 Gbit/s und 640 Gbit/s (OPTIK)
Weber, H.-G.; Berger, J.; Börner, C.; Dietrich, E.; Ehrke, H.-J.; Ferber, S.; Hilliger, E.; Knupke, H.; Küller, L.; Kroh, M.; Ludwig, R.; Marembert, V.; Schmidt-Langhorst, C.; Schubert, C.
Report
2007Phase-preserving 2R-regeneration of an 80-GB/s RZ-DQPSK signal by using a nonlinear amplifying loop mirror
Cvecek, K.; Sponsel, K.; Stephan, C.; Ludwig, R.; Schubert, C.; Onishchukov, G.; Schmauss, B.; Leuchs, G.
Conference Paper
2007Transmission Systems beyond 100 Gbit/s
Ludwig, R.; Schmidt-Langhorst, C.; Hüttl, B.; Schubert, C.; Weisser, S.; Raddatz, L.
Conference Paper
2007Ultrafast optical transmission technologies
Ludwig, R.; Schmidt-Langhorst, C.; Schubert, C.; Hüttl, B.; Weber, H.-G.
Conference Paper
2007Ultrafast Transmission Technology
Ludwig, R.
Conference Paper
2007Unrepeated Transmission of 160 Gb/s RZ-DPSK over 293 km Dispersion Managed Fiber using Optimized Raman Amplification and Advanced Forward-Error-Correction
Ludwig, R.; Weisser, S.; Schmidt-Langhorst, C.; Raddatz, L.; Schubert, C.
Conference Paper
2007Unrepeatered transmission of 160 Gb/s RZ-DPSK over 240 km dispersion managed fiber
Ludwig, R.; Weisser, S.; Schmidt-Langhorst, C.; Raddatz, L.; Schubert, C.
Conference Paper
2006107 Gbit/s transmission using an integrated ETDM receiver
Schubert, C.; Derksen, R.H.; Möller, M.; Ludwig, R.; Weiske, C.-J.; Lutz, J.; Ferber, S.; Schmidt-Langhorst, C.
Conference Paper
2006160 Gbit/s all-optical OOK to DPSK in-line format conversion
Schmidt-Langhorst, C.; Ludwig, R.; Galili, M.; Hüttl, B.; Futami, F.; Watanabe, S.; Schubert, C.
Conference Paper
20062000 km DWDM transmission of 85.2 Gbit/s DQPSK data with 100 GHz channel spacing over non-zero dispersion shifted fiber
Weisser, S.; Raddatz, L.; Ludwig, R.; Schubert, C.
Conference Paper
20065.4 bit/s (64*85.2) Gbit/s DQPSK transmission with 100 Ghz channel spacing over 2000 km non-zero dispersion shifted fiber
Ludwig, R.; Schubert, C.; Weisser, S.; Raddatz, L.
Conference Paper
2006High-speed transmission based on a 40 Gbaud DQPSK system
Schubert, C.; Ferber, S.; Ludwig, R.; Schmidt-Langhorst, C.; Weber, H.G.
Conference Paper
2006Integrated 100 Gbit/s ETDM receiver in a transmission experiment over 480 km DMF
Derksen, R.H.; Lehmann, G.; Weiske, C.-J.; Schubert, C.; Ludwig, R.; Ferber, S.; Schmidt-Langhorst, C.; Lutz, J.; Möller, M.
Conference Paper
2006Single channel 1.28 Tbit/s and 2.56 Tbit/s DQPSK transmission
Weber, H.G.; Ferber, S.; Kroh, M.; Schmidt-Langhorst, C.; Ludwig, R.; Marembert, V.; Boerner, C.; Futami, F.; Watanabe, S.; Schubert, C.
Journal Article
2006Single channel transmission beyond 1 Tbit/s
Schubert, C.; Ludwig, R.; Ferber, S.; Schmidt-Langhorst, C.; Hüttl, B.; Weber, H.G.
Conference Paper
2006Single channel transmission beyond 1 Tbit/s
Ludwig, R.; Ferber, S.; Schubert, C.; Schmidt-Langhorst, C.; Hüttl, B.; Weber, H.G.
Conference Paper
2006Single channel transmission beyond 1 Tbit/s
Ludwig, R.; Ferber, S.; Schubert, C.; Schmidt-Langhorst, C.; Hüttl, B.; Weber, H.G.
Conference Paper
2006Single- and alternating-polarization 170-Gb/s transmission up to 4000 km using dispersion-managed fiber and all-Raman amplification
Weisser, S.; Ferber, S.; Raddatz, L.; Ludwig, R.; Benz, A.; Boerner, C.; Weber, H.-G.
Journal Article
2006Terabit transmission on a single wavelength channel
Schubert, C.; Schmidt-Langhorst, C.; Ludwig, R.; Ferber, S.; Hüttl, B.; Weber, H.G.
Conference Paper
2006Transmitter enabling ultra-high speed transmission of phase modulated data signals up to 640 Gbit/s
Kroh, M.; Ferber, S.; Schmidt-Langhorst, C.; Marembert, V.; Schubert, C.; Ludwig, R.; Weber, H.G.
Conference Paper
2006Ultrafast transmission technology
Ludwig, R.; Ferber, S.; Schubert, C.; Schmidt-Langhorst, C.; Hüttl, B.; Weber, H.G.
Conference Paper
2006Ultrahigh-speed OTDM-transmission technology
Weber, H.G.; Ludwig, R.; Ferber, S.; Schmidt-Langhorst, C.; Kroh, M.; Marembert, V.; Boerner, C.; Schubert, C.
Journal Article
2005160 Gbit/s DPSK transmission over 320 km fibre link with high long-term stability
Ferber, S.; Ludwig, R.; Boerner, C.; Schubert, C.; Schmidt-Langhorst, C.; Kroh, M.; Marembert, V.; Weber, H.G.
Journal Article
2005160 Gbit/s OTDM long-haul transmission with long-term stability using RZ-DPSK modulation format
Ferber, S.; Schmidt-Langhorst, C.; Ludwig, R.; Boerner, C.; Schubert, C.; Marembert, V.; Kroh, M.; Weber, H.-G.
Journal Article
2005160 Gbit/s transmission systems, ready for operation?
Ludwig, R.; Ferber, S.; Boerner, C.; Schubert, C.; Schmidt-Langhorst, C.; Kroh, M.; Marembert, V.; Weber, H.G.
Conference Paper
2005160 Gbit/s transmission with long-term stability
Ferber, S.; Schmidt-Langhorst, C.; Ludwig, R.; Boerner, C.; Schubert, C.; Marembert, V.; Kroh, M.; Weber, H.-G.
Conference Paper
2005320 Gbit/s clock recovery with electro-optical PLL using a bidirectionally operated electroabsorption modulator as phase comparator
Boerner, C.; Marembert, V.; Ferber, S.; Schubert, C.; Schmidt-Langhorst, C.; Ludwig, R.; Weber, H.G.
Conference Paper
200540 GHz semiconductor mode-locked laser pulse source for 160 Gbit/s RZ-DPSK data transmission
Schubert, C.; Ferber, S.; Kroh, M.; Schmidt-Langhorst, C.; Ludwig, R.; Hüttl, B.; Kaiser, R.; Weber, H.G.
Conference Paper
2005640 Gbit/s DQPSK single-channel transmission over 480 km fibre link
Ferber, S.; Schubert, C.; Ludwig, R.; Boerner, C.; Schmidt-Langhorst, C.; Weber, H.G.
Conference Paper
2005640 Gbit/s DQPSK, single wavelength-channel transmission over 480 km fibre link
Ferber, S.; Schubert, C.; Ludwig, R.; Boerner, C.; Schmidt-Langhorst, C.; Weber, H.G.
Journal Article
200580 Gbit/s DPSK transmission over 480 km dispersion-managed fibre with balanced detection ETDM receiver
Ludwig, R.; Lee, W.S.; Schubert, C.; Ferber, S.; Börner, C.; Schmidt-Langhorst, C.; Weber, H.G.
Conference Paper
2005Automatic PMD compensator in a 160-Gb/s OTDM transmission over deployed fiber using RZ-DPSK modulation format
Kieckbusch, S.; Ferber, S.; Rosenfeldt, H.; Ludwig, R.; Boerner, C.; Ehrhardt, A.; Brinkmeyer, E.; Weber, H.-G.
Journal Article
2005Burst switching capability of electro-optical PLL-based clock recovery for 170 Gbit/s
Boerner, C.; Ludwig, R.; Ferber, S.; Weber, H.G.; Weisser, S.; Benz, A.; Raddatz, L.
Conference Paper
2005High-bandwidth balanced photoreceiver suitable for 40 Gb/s RZ-DPSK modulation formats
Schramm, C.; Bach, H.-G.; Beling, A.; Jacumeit, G.; Ferber, S.; Ludwig, R.; Ziegler, R.; Mekonnen, G.G.; Kunkel, R.; Schmidt, D.; Schlaak, W.; Unterbörsch, G.
Journal Article
2005High-speed optical signal processing using semiconductor optical amplifiers
Schubert, C.; Ludwig, R.; Weber, H.-G.
Journal Article
2005Optical sampling system including clock recovery for 320 Gbit/s DPSK and OOK data signals
Schmidt-Langhorst, C.; Schubert, C.; Boerner, C.; Marembert, V.; Ferber, S.; Ludwig, R.; Weber, H.G.
Conference Paper
2005Optical sampling technologies and applications
Schmidt-Langhorst, C.; Schubert, C.; Boerner, C.; Ludwig, R.
Conference Paper
2005Pushing the speed limit
Ludwig, R.
Journal Article
2005Single channel 1.28 Tbit/s and 2.56 Tbit/s DQPSK transmission
Weber, H.G.; Ferber, S.; Kroh, M.; Schmidt-Langhorst, C.; Ludwig, R.; Marembert, V.; Boerner, C.; Futami, F.; Watanabe, S.; Schubert, C.
Conference Paper
2005Single-channel 170 Gbit/s transmission up to 4000 km using dispersion-managed fiber spans and all-Raman amplification
Ludwig, R.; Weisser, S.; Raddatz, L.; Benz, A.; Ferber, S.; Boerner, C.; Weber, H.G.
Conference Paper
2005Technologies enabling ultrahigh speed transmission
Ludwig, R.; Ferber, S.; Boerner, C.; Schubert, C.; Schmidt-Langhorst, C.; Kroh, M.; Marembert, V.; Weber, H.G.
Conference Paper
2005Ultrafast transmission technology
Ludwig, R.
Conference Paper
2004160 Gb/s regenerating conversion node
Ferber, S.; Ludwig, R.; Boerner, C.; Schmidt-Langhorst, C.; Molle, L.; Habel, K.; Rohde, M.; Weber, H.G.; Futami, F.; Watanabe, S.
Conference Paper
2004Adaptive PMD compensator in 160Gb/s DPSK transmission over installed fiber
Kieckbusch, S.; Ferber, S.; Rosenfeldt, H.; Ludwig, R.; Boerner, C.; Ehrhardt, A.; Brinkmeyer, E.; Weber, H.G.
Conference Paper
2004High-speed optical signal processing and data transmission
Weber, H.G.; Ludwig, R.; Ferber, S.; Boerner, C.; Schubert, C.; Schmidt-Langhorst, C.; Hilliger, E.; Kroh, M.; Marembert, V.
Conference Paper
2004Ultrafast all-optical 3R-regeneration
Watanabe, S.; Ludwig, R.; Futami, F.; Schubert, C.; Ferber, S.; Boerner, C.; Schmidt-Langhorst, C.; Berger, J.; Weber, H.-G.
Journal Article
2004Ultrafast technologies in 160 Gbit/s transmission systems
Schmidt-Langhorst, C.; Schubert, C.; Boerner, C.; Ferber, S.; Ludwig, R.; Berger, J.; Hilliger, E.; Marembert, V.; Kroh, M.; Ehrke, H.-J.; Weber, H.-G.
Conference Paper
2003160 Gbit/s clock recovery with electro-optical PLL using a bidirectionally operated electroabsorption modulator as phase comparator
Börner, C.; Schubert, C.; Schmidt, C.; Hilliger, E.; Marembert, V.; Berger, J.; Ferber, S.; Dietrich, E.; Ludwig, R.; Schmauss, B.; Weber, H.G.
Conference Paper
2003160 Gbit/s clock recovery with electro-optical PLL using bidirectionally operated electroabsorption modulator as phase comparator
Boerner, C.; Schubert, C.; Schmidt, C.; Hilliger, E.; Marembert, V.; Berger, J.; Ferber, S.; Dietrich, E.; Ludwig, R.; Schmauss, B.; Weber, H.G.
Journal Article
2003160 Gbit/s optical 3R-regenerator in a fiber transmission experiment
Watanabe, S.; Futami, F.; Okabe, R.; Takita, Y.; Ferber, S.; Ludwig, R.; Schubert, C.; Schmidt, C.; Weber, H.G.
Conference Paper
2003Comparison of DPSK and OOK modulation format in 160 Gbit/s transmission system
Ferber, S.; Ludwig, R.; Boerner, C.; Wietfeld, A.; Schmauss, B.; Berger, J.; Schubert, C.; Unterbörsch, G.; Weber, H.G.
Journal Article
2003Error-free all-optical add-drop multiplexing at 160 Gbit/s
Schubert, C.; Schmidt, C.; Ferber, S.; Ludwig, R.; Weber, H.G.
Journal Article
2003Monolithically integrated balanced photodetector and its application in OTDM 160 Gbit/s DPSK transmission
Beling, A.; Bach, H.G.; Schmidt, D.; Mekonnen, G.G.; Ludwig, R.; Ferber, S.; Schubert, C.; Börner, C.; Schmauss, B.; Berger, J.; Schmidt, C.; Troppenz, U.; Weber, H.G.
Journal Article
2002160 Gbit/s wavelength converter with 3R-regenerating capability
Schubert, C.; Ludwig, R.; Watanabe, S.; Futami, E.; Schmidt, C.; Berger, J.; Boerner, C.; Ferber, S.; Weber, H.G.
Journal Article
200240 GHz optical clock extraction from 160 Gbit/s data signals using PLL-based clock recovery
Yamamoto, T.; Schmidt, C.; Dietrich, E.; Schubert, C.; Berger, J.; Ludwig, R.; Weben, H.G.
Conference Paper
2002Comparison of interferometric all-optical switches for demultiplexing applications in high-speed OTDM systems
Schubert, C.; Berger, J.; Diez, S.; Ehrke, H.J.; Ludwig, R.; Feiste, U.; Schmidt, C.; Weber, H.G.; Toptchiyski, G.; Randel, S.; Petermann, K.
Journal Article
2002Complete optical sampling system with broad gap-free spectral range for 160 Gbit/s and 320 Gbit/s and its application in a transmission system
Schmidt, C.; Futami, F.; Watanabe, S.; Yamamoto, T.; Schubert, C.; Berger, J.; Kroh, M.; Ehrke, H.-J.; Dietrich, E.; Börner, C.; Ludwig, R.; Weber, H.G.
Conference Paper
2002Enabling transmission at 160 Gbit/s
Ludwig, R.; Feiste, U.; Schmidt, C.; Schubert, C.; Berger, J.; Hilliger, E.; Kroh, M.; Yamamoto, T.; Weinert, C.M.; Weber, H.G.
Conference Paper
2002Impact of fiber chromatic dispersion in high-speed TDM transmission-systems
Konrad, B.; Petermann, K.; Berger, J.; Ludwig, R.; Weinert, C.M.; Weber, H.G.; Schmauss, B.
Journal Article
2002Optical Q-factor monitoring at 160 Gb/s using an optical sampling system in an 80 km transmission experiment
Schmidt, C.; Schubert, C.; Berger, J.; Kroh, M.; Ehrke, H.-J.; Dietrich, E.; Börner, C.; Ludwig, R.; Weber, H.G.; Futami, F.; Watanabe, S.; Yamamoto, T.
Conference Paper
2001160 Gb/s all-optical demultiplexer using a hybrid gain-transparent SOA Mach-Zehnder-interferometer
Diez, S.; Schubert, C.; Ludwig, R.; Ehrke, H.-J.; Feiste, U.; Schmidt, C.; Weber, H.G.
Conference Paper
2001160 Gb/s all-optical demultiplexing using a gain-transparent ultrafast-nonlinear interferometer
Diez, S.; Schubert, C.; Feiste, U.; Ludwig, R.; Berger, J.; Weber, H.G.
Conference Paper
2001160 Gbit/s demultiplexer with clock recovery using SOA-based interferometric switches and its application to 120 km fiber transmission
Yamamoto, T.; Feiste, U.; Berger, J.; Schubert, C.; Schmidt, C.; Ludwig, R.; Weber, H.G.
Conference Paper
2001160 Gbit/s field transmission over 116 km standard single mode fibre using 160 Gbit/s OTDM and 40 Gbit/s ETDM demultiplexer
Feiste, U.; Ludwig, R.; Schubert, C.; Berger, J.; Schmidt, C.; Weber, H.G.; Schmauss, B.; Munk, A.; Buchold, B.; Briggmann, D.; Kueppers, F.; Rumpf, F.
Journal Article
2001160 Gbit/s transmission over 116 km field-installed fiber using 160 Gbit/s OTDM and 40 Gbit/s ETDM
Feiste, U.; Ludwig, R.; Schubert, C.; Berger, J.; Schmidt, C.; Weber, H.G.
Conference Paper
2001160 Gbit/s transmission over 116 km field-installed fibre using 160 Gbit/s OTDM and 40 Gbit/s ETDM
Feiste, U.; Ludwig, R.; Schubert, C.; Berger, J.; Schmidt, C.; Weber, H.G.; Schmauss, B.; Munk, A.; Buchold, B.; Briggmann, D.; Kueppers, F.; Rumpf, F.
Journal Article
2001160-Gb/s all-optical demultiplexing using a gain-transparent ultrafast-nonlinear interferometer (GT-UNI)
Schubert, C.; Diez, S.; Berger, J.; Ludwig, R.; Feiste, U.; Weber, H.G.; Toptchiyski, G.; Petermann, K.; Krajinovic, V.
Journal Article
2001160-Gb/s polarization insensitive all-optical demultiplexing using a gain-transparent ultrafast nonlinear interferometer (GT-UNI)
Schubert, C.; Berger, J.; Feiste, U.; Ludwig, R.; Schmidt, C.; Weber, H.G.
Journal Article
2001Clock recovery from 160 Gbit/s data signals using phase-locked loop with interferometric optical switch based on semiconductor optical amplifier
Yamamoto, T.; Oxenlowe, L.K.; Schmidt, C.; Schubert, C.; Hilliger, E.; Feiste, U.; Berger, J.; Ludwig, R.; Weber, H.G.
Journal Article
2001Experimental verification of noise squeezing by an optical intensity filter in high-speed transmission
Ludwig, R.; Sizmann, A.; Feiste, U.; Schubert, C.; Kroh, M.; Weinert, C.M.; Weber, H.G.
Conference Paper
2001High bit rate OTDM-transmission on standard fibre
Weinert, C.M.; Berger, J.; Feiste, U.; Hilliger, E.; Konrad, B.; Kroh, M.; Ludwig, R.; Petermann, K.; Schmidt, C.; Schubert, C.; Weber, H.G.; Yamamoto, T.
Journal Article
2001Hybrid semiconductor polymer resonant grating waveguide structures
Levy-Yurista, G.; Friesem, A.A.; Pawlowski, E.; Küller, L.; Ludwig, R.; Weber, H.G.; Donval, A.; Toussaere, E.; Zyss, J.
Journal Article
2001Nonlinear optical intensity filters: Experiment and design rules
Weinert, C.M.; Sizmann, A.; Ludwig, R.; Schubert, C.; Feiste, U.; Weber, H.G.
Conference Paper
2001Optical TDM-transmission systems for channel rates of 40 Gbit/s and above
Berger, J.; Breuer, D.; Feiste, U.; Konrad, B.; Ludwig, R.; Petermann, K.; Weber, H.G.; Weinert, C.M.
Conference Paper
2000160 Gbit/s all-optical demultiplexing using hybrid gain-transparent SOA Mach-Zehnder interferometer
Diez, S.; Schubert, C.; Ludwig, R.; Ehrke, H.-J.; Feiste, U.; Schmidt, C.; Weber, H.G.
Journal Article
200080 Gbit/s all-optical demultiplexing using a hybrid Mach-Zehnder- interferometer switch with gain-clamped semiconductor optical amplifiers
Hilliger, E.; Diez, S.; Ehrke, H.-J.; Ludwig, R.; Schmidt, C.; Weber, H.G.; Emery, J.Y.
Conference Paper
2000Analysis of switching windows in a gain-transparent SLALOM configuration
Toptchiyski, G.; Randel, S.; Petermann, K.; Diez, S.; Hilliger, E.; Schmidt, C.; Schubert, C.; Ludwig, R.; Weber, H.G.
Journal Article
2000Femtosecond pulse source with grating-waveguide structure
Pawlowski, E.; Friesem, A.A.; Kuller, L.; Levy-Yurista, G.; Ludwig, R.; Weber, H.G.
Conference Paper
2000In-line saturable absorber in transmission-systems with cascaded semiconductor optical amplifiers
Bakonyi, Z.; Onishchukov, G.; Knöll, C.; Gölles, M.; Lederer, F.; Ludwig, R.
Journal Article
2000PMD compensation in 10Gbit-s NRZ field experiment using polarimetric error signal
Rosenfeldt, H.; Ulrich, R.; Feiste, U.; Ludwig, R.; Weber, H.G.; Ehrhardt, A.
Journal Article
2000Unrepeatered 160 Gbit/s RZ single channel transmission over 160 km of standard fiber at 1.55 mu m with hybrid MZI optical DEMUX
Ludwig, R.; Feiste, U.; Diez, S.; Schubert, C.; Schmidt, C.; Ehrke, H.J.; Weber, H.G.
Conference Paper
2000Unrepeatered 160 Gbit/s RZ single-channel transmission over 160 km of standard fibre at 1.55 mu m with hybrid MZI optical demultiplexer
Ludwig, R.; Feiste, U.; Diet, S.; Schubert, C.; Schmidt, C.; Ehrke, H.J.; Weber, H.G.
Journal Article
2000Unrepeatered 80 Gbit/s RZ single channel transmission over 160 km of standard fiber at 1.55 mu m with a large wavelength tolerance
Feiste, U.; Ludwig, R.; Diez, S.; Schmidt, C.; Ehrke, H.J.; Weber, H.G.
Conference Paper
2000Unrepeatered 80 Gbit/s RZ single channel transmission over 160 km of standard fibre at 1.55 mu m with large wavelength tolerance
Feiste, U.; Ludwig, R.; Diez, S.; Schmidt, C.; Ehrke, H.J.; Weber, H.G.; Kuppers, F.
Journal Article
1999160 Gbit/s optical sampling by a novel ultra-broadband switch based on four-wave mixing in a semiconductor optical amplifier
Diez, S.; Ludwig, R.; Schmidt, C.; Feiste, U.; Weber, H.G.
Conference Paper
1999160-Gb/s optical sampling by gain-transparent four-wave mixing in a semiconductor optical amplifier
Diez, S.; Ludwig, R.; Schmidt, C.; Feiste, U.; Weber, H.G.
Journal Article
199940 Gb/s and 4*40 Gb/s TDM/WDM standard fiber transmission
Weinert, C.M.; Ludwig, R.; Pieper, W.; Weber, H.G.; Breuer, D.; Petermann, K.; Kuppers, F.
Journal Article
199980 Gbit/s transmission over 106 km standard-fiber using optical phase conjugation in a Sagnac-interferometer
Feiste, U.; Ludwig, R.; Schmidt, C.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Patzak, E.; Weber, H.G.
Conference Paper
199980-Gb/s transmission over 106-km standard-fiber using optical phase conjugation in a Sagnac-interferometer
Feiste, U.; Ludwig, R.; Schmidt, C.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Patzak, E.; Weber, H.G.; Merker, T.
Journal Article
1999Applications of SOA's for optical signal processing and OTDM
Ludwig, R.; Diez, S.; Hilliger, E.; Schmidt, C.; Weber, H.G.
Conference Paper
1999Bit-rate flexible all-optical clock recovery
Sartorius, B.; Bornholdt, C.; Brox, O.; Ehrke, H.J.; Hoffmann, D.; Ludwig, R.; Mohrle, M.
Conference Paper
1999Experimental comparison of 40 Gbit/s RZ and NRZ transmission over standard singlemode fibre
Ludwig, R.; Feiste, U.; Dietrich, E.; Weber, H.G.; Breuer, D.; Martin, M.; Kuppers, F.
Journal Article
1999Gain-transparent SOA-switch for high-bitrate OTDM add/drop multiplexing
Diez, S.; Ludwig, R.; Weber, H.G.
Journal Article
1999High-speed transmission over standard fiber
Weber, H.G.; Breuer, D.; Feiste, U.; Koltchanov, I.; Ludwig, R.; Weinert, C.M.
Conference Paper
1999Mode-locked semiconductor lasers and their applications for optical signal processing
Schmidt, C.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Feiste, U.; Kuller, L.; Ludwig, R.; Weber, H.G.
Conference Paper
1999RZ versus NRZ modulation format for dispersion compensated SMF-based 10-Gb/s transmission with more than 100-km amplifier spacing
Caspar, C.; Foisel, H.-M.; Gladisch, A.; Hanik, N.; Kuppers, F.; Ludwig, R.; Mattheus, A.; Pieper, W.; Strebel, B.; Weber, H.G.
Journal Article
19984-channel*40-Gb/s unrepeatered OTDM transmission over 100-km standard fiber
Pieper, W.; Ludwig, R.; Weinert, C.M.; Kuhlow, B.; Przyrembel, G.; Ferstl, M.; Pawlowski, E.; Weber, H.G.
Journal Article
199840 Gbit/s transmission over 200 km of standard-fiber using polarisation independent mid-span spectral inversion
Feiste, U.; Ludwig, R.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Razic, D.; Weber, H.G.
Conference Paper
199840 Gbit/s transmission over 434 km standard fibre using polarisation independent mid-span spectral inversion
Feiste, U.; Ludwig, R.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Razic, D.; Weber, H.G.
Journal Article
199840 Gbit/s transmission over 434 km standard-fiber using polarisation independent mid-span spectral inversion
Feiste, U.; Ludwig, R.; Dietrich, E.; Diez, S.; Ehrke, H.J.; Razic, D.; Weber, H.G.
Conference Paper
1998All-optical clock recovery module based on self-pulsating DFB laser
Sartorius, B.; Bornholdt, C.; Brox, O.; Ehrke, H.J.; Hoffmann, D.; Ludwig, R.; Mohrle, M.
Journal Article
1998All-optical switch for TDM and WDM/TDM systems demonstrated in a 640 Gbit/s demultiplexing experiment
Diez, S.; Ludwig, R.; Weber, H.G.
Journal Article
1998Effect of birefringence in a bulk semiconductor optical amplifier on four-wave mixing
Diez, S.; Schmidt, C.; Ludwig, R.; Weber, H.G.; Doussiere, P.; Ducellier, T.
Journal Article
1998Effect of the particle size on the burning behavior of B/KNO3 ignitor mixtures
Weiser, V.; Kuhn, D.; Ludwig, R.; Poth, H.
Conference Paper
1998High-power performance of a high-speed photodetector
Unterborsch, G.; Trommer, D.; Umbach, A.; Ludwig, R.; Bach, H.G.
Conference Paper
1998High-speed all-optical signal processing by switching devices based on semiconductor optical amplifiers
Diez, S.; Ludwig, R.; Weber, H.-G.
Conference Paper
1998Novel gain-transparent SOA-switch for high bitrate OTDM add/drop multiplexing
Diez, S.; Ludwig, R.; Patzak, E.; Weber, H.G.
Conference Paper
1998System performance of an all-optical clock recovery module
Sartorius, B.; Bornholdt, C.; Brox, O.; Ehrke, H.J.; Hoffmann, D.; Ludwig, R.; Möhrle, M.
Conference Paper
1998A tunable femtosecond modelocked semiconductor laser for applications in OTDM-systems
Ludwig, R.; Diez, S.; Ehrhardt, A.; Kuller, L.; Pieper, W.; Weber, H.G.
Journal Article
1997Birefringence in polarization insensitive semiconductor optical amplifiers: Influence on four-wave mixing
Diez, S.; Schmidt, C.; Ludwig, R.; Weber, H.G.; Kindt, S.; Obermann, K.; Kolchanov, I.; Petermann, K.; Ducellier, T.; Doussiere, P.
Conference Paper
1997Extinction ratio degradation in a 40 Gbit/s optical demultiplexer based on a monolithically integrated Michelson-interferometer
Pieper, W.; Ludwig, R.; Weber, H.G.; Schilling, M.; Daub, K.; Lach, E.; Laube, G.; Idler, W.; Wunstel, K.
Conference Paper
1997Four-wave mixing in semiconductor optical amplifiers for frequency conversion and fast optical switching
Diez, S.; Schmidt, C.; Ludwig, R.; Weber, H.G.; Obermann, K.; Kindt, S.; Koltchanov, I.; Petermann, K.
Journal Article
1997Gb/s NRZ/RZ transmission over 2000 km standard fibre with more than 100 km amplifier spacing
Caspar, C.; Foisel, H.-M.; Gladisch, A.; Hanik, N.; Kuppers, F.; Ludwig, R.; Mattheus, A.; Pieper, W.; Strebel, B.; Weber, H.G.
Conference Paper
1997Switching window of picosecond pulse switching using four-wave mixing in semiconductor-optical amplifiers
Schmidt, C.; Diez, S.; Ludwig, R.; Weber, H.G.
Conference Paper
1997Techniques for 40 Gbit/s OTDM-systems
Pieper, W.; Ludwig, R.; Weber, H.G.
Conference Paper
1997Unrepeated 40-Gbit/s RZ single-channel transmission over 150 km of standard fiber at 1.55 mu m
Ludwig, R.; Pieper, W.; Weber, H.G.; Breuer, D.; Petermann, K.; Kuppers, F.; Mattheus, A.
Conference Paper
1997Unrepeatered 40 Gbit/s RZ single channel transmission over 150 km of standard singlemode fibre at 1.55 mu m
Ludwig, R.; Pieper, W.; Weber, H.G.; Breuer, D.; Petermann, K.; Kuppers, F.; Mattheus, A.
Journal Article
199610 GHz all-optical clock recovery using a mode-locked semiconductor laser in a 40 Gbit/s, 100-km transmission experiment
Ludwig, R.; Pieper, W.; Jahn, E.; Agrawal, N.; Ehrhardt, A.; Kuller, L.; Weber, H.G.
Conference Paper
199640 Gbit/s demultiplexing experiment with 10 GHz all-optical clock recovery using a modelocked semiconductor laser
Ludwig, R.; Ehrhardt, A.; Pieper, W.; Jahn, E.; Agrawal, N.; Ehrke, H.-J.; Kuller, L.; Weber, H.G.
Journal Article
1996All-optical polarisation and wavelength independent 3R signal regenerator
Pieper, W.; Weich, K.; Ludwig, R.; Patzak, E.; Weber, H.G.
Journal Article
1996All-optical polarization and wavelength independent 3R signal regenerator
Pieper, W.; Weich, K.; Ludwig, R.; Patzak, E.; Weber, H.G.
Conference Paper
1996Characterization of an all-optical clock recovery operating in excess of 40 Gbit/s
Ehrhardt, A.; Ludwig, R.; Pieper, W.; Jahn, E.; Weber, H.G.
Conference Paper
1996Fiber loop optical buffer
Langenhorst, R.; Eiselt, M.; Pieper, W.; Grosskopf, G.; Ludwig, R.; Kuller, L.; Dietrich, E.; Weber, H.G.
Journal Article
1996Four-wave mixing in semiconductor laser amplifiers: Applications for optical communication systems
Ludwig, R.; Pieper, W.; Schnabel, R.; Diez, S.; Weber, H.G.
Journal Article
1996Four-wave mixing in semiconductor laser amplifiers: Phase matching in configurations with three input waves
Diez, S.; Ludwig, R.; Patzak, E.; Weber, H.G.; Eisenstein, G.; Schimpe, R.
Conference Paper
1996Monolithically integrated asymmetric Mach-Zehnder interferometer as a 20 Gbit/s all-optical add/drop multiplexer for OTDM systems
Jahn, E.; Agrawal, N.; Ehrke, H.-J.; Ludwig, R.; Pieper, W.; Weber, H.G.
Journal Article
1996Optical time-domain demultiplexing techniques using semiconductor laser amplifiers
Weber, H.G.; Agrawal, N.; Ehrhardt, A.; Ehrke, H.J.; Eiselt, M.; Jahn, E.; Ludwig, R.; Pieper, W.; Schnabel, R.
Conference Paper
1996Ultrafast optical signal processing using semiconductor laser amplifiers
Schnabel, R.; Ludwig, R.; Pieper, W.; Diez, S.; Weber, H.G.
Journal Article
19953*10 Gbit/s, 100 km data transmission based an sliced spectrum signal generation using a single tunable mode locked semiconductor laser pulse source
Ludwig, R.; Pieper, W.; Langenhorst, R.; Weber, H.G.
Conference Paper
199540 Gbit/s all-optical demultiplexing using a monolithically integrated Mach-Zehnder interferometer with semiconductor laser amplifiers
Jahn, E.; Agrawal, N.; Arbert, M.; Ehrke, H.-J.; Franke, D.; Ludwig, R.; Pieper, W.; Weber, H.G.; Weinert, C.M.
Journal Article
199540 Gbit/s all-optical demultiplexing using a monolithically integrated Mach-Zehnder interferometer with semiconductor laser amplifiers
Jahn, E.; Agrawal, N.; Arbert, M.; Ehrke, H.-J.; Franke, D.; Ludwig, R.; Pieper, W.; Weber, H.G.; Weinert, C.M.
Conference Paper
1995Datennetz mit Lichtwellenleitern.
Kohn, U.; Ludwig, R.
Patent
1995Four-wave mixing and asymmetric nonlinear gain in a semiconductor-laser amplifier
Ludwig, R.; Schnabel, R.; Weber, H.G.; Wissenfeld, J.
Conference Paper
1995Optical time-domain demultiplexing using semiconductor laser amplifiers
Eiselt, M.; Pieper, W.; Schnabel, R.; Ludwig, R.; Weber, H.G.
Conference Paper
1995Turn-key-ready wavelength-, repetition rate- and pulsewidth-tunable femtosecond hybrid modelocked semiconductor laser
Ludwig, R.; Ehrhardt, A.
Journal Article
1995Two stage polarization insensitive regenerative wavelength converter
Weich, K.; Horer, J.; Eggemann, R.; Patzak, E.; Ludwig, R.; Mohrle, M.; Schimpe, R.
Conference Paper
1994200 fs optical pulses from a wavelength, repetition rate and pulse width tunable hybrid mode locked semiconductor laser
Ehrhardt, A.; Ludwig, R.
Conference Paper
1994BER measurements of frequency converted signals using four-wave mixing in a semiconductor laser amplifier at 1, 2.5, 5 and 10 Gbit/s
Ludwig, R.; Raybon, G.
Journal Article
1994Nonlinearity-insensitive standard-fiber transmission based on optical-phase conjugation in a semiconductor-laser amplifier
Pieper, W.; Kurtzke, C.; Schnabel, R.; Breuer, D.; Ludwig, R.; Weber, H.G.; Petermam, K.
Conference Paper
1994Nonlinearity-insensitive standard-fibre transmission based on optical-phase conjugation in a semiconductor-laser amplifier
Pieper, W.; Kurtzke, C.; Schnabel, R.; Breuer, D.; Ludwig, R.; Petermann, K.; Weber, H.G.
Journal Article
1994Polarization insensitive frequency conversion of a 10-channel OFDM signal using four-wave-mixing in a semiconductor laser amplifier
Schnabel, R.; Hilbk, U.; Hermes, T.; Meissner, P.; Helmolt, C.; Magari, K.; Raub, F.; Pieper, W.; Westphal, F.J.; Ludwig, R.; Kuller, L.; Weber, H.G.
Journal Article
1993All-optical and gate using femtosecond nonlinear gain dynamics in semiconductor laser amplifiers
Schnabel, R.; Pieper, W.; Ludwig, R.; Weber, H.G.
Conference Paper
1993All-optical demultiplexing using ultrafast four-wave-mixing in a semiconductor laser amplifier at 20 Gbit/s
Ludwig, R.; Raybon, G.
Conference Paper
1993Multiterahertz frequency conversion of a picosecond pulse train using nonlinear gain dynamics in a 1.5 mu m MQW semiconductor laser amplifier
Schnabel, R.; Pieper, W.; Ludwig, R.; Weber, H.G.
Journal Article
1993One million pulse circulations in a fiber ring using a SLALOM for pulse shaping and noise reduction
Eiselt, M.; Pieper, W.; Grosskopf, G.; Ludwig, R.; Weber, H.G.
Journal Article
1993Photonic packet switching experiments in a 2*2 switching node incorporating a fiber loop buffer
Eiselt, M.; Ehrhardt, A.; Grosskopf, G.; Ludwig, R.; Pieper, W.; Schnabel, R.; Weber, H.G.
Conference Paper
1993Polarisation insensitive frequency conversion of a 10-channel OFDM signal over 275 GHz in a semiconductor laser amplifier
Schnabel, R.; Hilbk, U.; Hermes, T.; Meissner, P.; Helmolt, C. von; Magari, K.; Raub, F.; Pieper, W.; Westphal, F.J.; Ludwig, R.; Kuller, L.; Weber, H.G.
Conference Paper
1993Semiconductor laser amplifier as optical switching gate
Ehrhardt, A.; Eiselt, M.; Grossopf, G.; Kuller, L.; Ludwig, R.; Pieper, W.; Schnabel, R.; Weber, H.G.
Journal Article
1992Photonic ATM switching with semiconductor laser amplifier gates
Eiselt, M.; Grosskopf, G.; Ludwig, R.; Pieper, W.; Weber, H.G.
Journal Article
1991BER measurements in random access fibre loop optical memory
Dietrich, E.; Grosskopf, G.; Kuller, L.; Ludwig, R.; Pieper, W.; Weber, H.G.
Journal Article
1991Optical signal processing using semiconductor laser amplifiers
Weber, H.G.; Grosskopf, G.; Ludwig, R.; Patzak, E.; Schnabel, R.
Conference Paper
1991Random access fiber loop optical memory with active switching and amplifying elements for optical ATM systems
Ludwig, R.; Deitrich, E.; Grosskopf, G.; Kuller, L.; Pieper, W.; Weber, H.G.
Conference Paper
1991Semiconductor laser amplifiers as all-optical frequency converters
Schunk, N.; Grosskopf, G.; Ludwig, R.; Schnabel, R.; Weber, H.G.
Conference Paper
1990Frequency conversion by four-wave-mixing in LD amplifiers
Grosskopf, G.; Ludwig, R.; Schnabel, R.; Schunk, N.; Weber, H.G.
Conference Paper
1990Frequency conversion by nearly-degenerate four-wave mixing in travelling-wave semiconductor laser amplifiers
Schunk, N.; Grosskopf, G.; Ludwig, R.; Schnabel, R.; Weber, H.G.
Journal Article
1990Optical amplifiers in fibre optic communication networks
Grosskopf, G.; Ludwig, R.; Schnabel, R.; Schunk, N.; Weber, H.G.
Conference Paper
1990Optical travelling wave amplifiers with multi-section semiconductor-laser structures
Ludwig, R.; Moehrle, M.; Rosenzweig, M.; Schnabel, R.; Schunk, N.; Weber, H.G.
Journal Article
1990Properties of two-section traveling wave amplifiers
Ludwig, R.; Moerhrle, M.; Rosenzweig, M.; Schnabel, R.; Schunk, N.; Weber, H.G.
Conference Paper
1989Characteristics of semiconductor laser optical amplifier as phase modulator
Grosskopf, G.; Ludwig, R.; Schnabel, R.; Weber, H.G.
Journal Article
1989Semiconductor laser optical amplifiers for multichannel coherent optical transmission
Dietrich, E.; Enning, B.; Grosskopf, G.; Kuller, L.; Ludwig, R.; Molt, R.; Patzak, E.; Weber, H.G.
Journal Article
1989Semiconductor laser optical amplifiers in switching and distribution networks
Grosskopf, G.; Kuller, L.; Ludwig, R.; Schnabel, R.; Weber, H.G.
Journal Article
1988140 Mbit/s DPSK transmission using an all-optical frequency convertor with a 4000 GHz conversion range
Grosskopf, G.; Ludwig, R.; Weber, H.G.
Journal Article
1988Application of nonlinear effects in semiconductor-laser optical amplifiers
Grosskopf, G.; Ludwig, R.; Weber, H.G.
Conference Paper
1988Cascaded in-line optical amplifiers in multichannel coherent optical transmission
Grosskopf, G.; Ludwig, R.; Weber, H.G.
Conference Paper
1988Cascaded inline semiconductor laser amplifiers in a coherent optical fibre transmission system
Grosskopf, G.; Ludwig, R.; Weber, H.G.
Journal Article
1988Effect of channel spacing in an optical two-channel DPSK transmission system with optical amplifiers
Gross Kopf, G.; Ludwig, R.
Journal Article
1988Four-wave mixing in a semiconductor laser amplifier
Grosskopf, G.; Ludwig, R.; Waarto, R.G.; Wegen, H.G.
Journal Article
1988Semiconductor-laser amplifier as an optical controlled switch
Grosskopf, G.; Ludwig, R.; Molt, R.; Weber, H.G.; Zhang, S.B.
Journal Article
1987Gain properties of semiconductor laser amplifiers with reduced facet reflectivity
Grosskopf, G.; Ludwig, R.
Journal Article
1987Optical amplifier configurations with low polarisation sensitivity
Grosskopf, G.; Ludwig, R.; Waarts, R.G.; Weber, H.G.
Journal Article
1987Polarization insensitive optical amplifier configurations
Grosskopf, G.; Ludwig, R.; Molt, R.; Weber, H.G.
Conference Paper
1986Crosstalk in optical amplifiers for two-channel transmission
Grosskope, G.; Ludwig, R.; Weber, H.G.
Journal Article
1986Experiments on optical amplifiers for two channel transmission
Grosskopf, G.; Kuller, L.; Ludwig, R.; Molt, R.; Weber, H.G.
Conference Paper
1986Ten-channel coherent optic fibre transmission using an optical traveling wave amplifier
Braun, R.-P.; Ludwig, R.; Molt, R.
Conference Paper