R. Ludwig

476 total citations
46 papers, 356 citations indexed

About

R. Ludwig is a scholar working on Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics and Environmental Engineering. According to data from OpenAlex, R. Ludwig has authored 46 papers receiving a total of 356 indexed citations (citations by other indexed papers that have themselves been cited), including 36 papers in Electrical and Electronic Engineering, 11 papers in Atomic and Molecular Physics, and Optics and 10 papers in Environmental Engineering. Recurrent topics in R. Ludwig's work include Optical Network Technologies (22 papers), Photonic and Optical Devices (17 papers) and Semiconductor Lasers and Optical Devices (16 papers). R. Ludwig is often cited by papers focused on Optical Network Technologies (22 papers), Photonic and Optical Devices (17 papers) and Semiconductor Lasers and Optical Devices (16 papers). R. Ludwig collaborates with scholars based in Germany, Japan and United States. R. Ludwig's co-authors include H.G. Weber, G. Großkopf, W. Pieper, Colja Schubert, H. Weber, S. Ferber, C.M. Weinert, Carsten Schmidt‐Langhorst, H.J. Ehrke and Michael Möller and has published in prestigious journals such as Applied Physics Letters, Remote Sensing and Economic Geology.

In The Last Decade

R. Ludwig

43 papers receiving 328 citations

Peers

R. Ludwig

EEE

AMPO

GEOPH

Allen Davis United States

M. Nyffeler Switzerland

Smrity Dwivedi India

Jeongwoo Han United States

K. Heiska Finland

Jicheng Zhang China

Kazuhiro Nishida Japan

Jan Kristoffer Brenne Norway

陈卫标 Chen Weibiao China

Maria Matveeva Germany

Allen Davis United States

R. Ludwig

206 ×0.8

EEE

66 ×0.9

AMPO

4 ×0.1

20 ×0.6

GEOPH

32 ×1.1

Citations per year, relative to R. Ludwig R. Ludwig (= 1×) peers Allen Davis

Countries citing papers authored by R. Ludwig

Since Specialization

Citations

This map shows the geographic impact of R. Ludwig's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by R. Ludwig with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites R. Ludwig more than expected).

Fields of papers citing papers by R. Ludwig

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by R. Ludwig. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by R. Ludwig. The network helps show where R. Ludwig may publish in the future.

Co-authorship network of co-authors of R. Ludwig

This figure shows the co-authorship network connecting the top 25 collaborators of R. Ludwig. A scholar is included among the top collaborators of R. Ludwig based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with R. Ludwig. R. Ludwig is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Marzahn, Philip, Dirk Rieke‐Zapp, & R. Ludwig. (2012). Soil surface roughness characterization for microwave remote sensing applications. EGU General Assembly Conference Abstracts. 14172. 1 indexed citations

Lievens, Hans, Jesús Álvarez‐Mozos, Philip Marzahn, et al.. (2010). Soil moisture retrieval from C- and L-band SAR using modeled effective roughness. EGU General Assembly Conference Abstracts. 3163. 1 indexed citations

Derksen, Rainer H., C.-J. Weiske, Colja Schubert, et al.. (2006). Integrated 100 Gbit/s ETDM Receiver in a Transmission Experiment over 480 km DMF. Publikationsdatenbank der Fraunhofer-Gesellschaft (Fraunhofer-Gesellschaft). 1–3. 29 indexed citations

Mauser, Wolfram, Alexander Loew, & R. Ludwig. (2004). Multiscale Soil-Moisture Retrieval to Monitor the Global Change of the Water Cycle - Perspectives from the GLOWA-Danube Project. MPG.PuRe (Max Planck Society). 572. 2 indexed citations

Weber, H.G., R. Ludwig, Christian Schmidt, et al.. (2002). 160 Gbit/s TDM-Transmission Technology. European Conference on Optical Communication. 1. 1–2. 6 indexed citations

Schubert, Colja, R. Ludwig, Shinya Watanabe, et al.. (2002). Improved Performance of a 160 Gb/s Fibre based all-optical Switch using Rectangular Gating Pulses. European Conference on Optical Communication. 3. 1–2. 2 indexed citations

Schmidt, Christian, Colja Schubert, Shunsuke Watanabe, et al.. (2002). 320 Gb/s All-Optical Eye Diagram Sampling using Gain-Transparent Ultrafast-Nonlinear Interferometer (GT-UNI). European Conference on Optical Communication. 1. 1–2. 9 indexed citations

Dettmann, Wolfgang, et al.. (2002). Alternating phase-shifting masks: phase determination and impact of quartz defects--theoretical and experimental results. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 4754. 410–410. 2 indexed citations

Futami, Fumio, Shigeki Watanabe, Tsuyoshi Yamamoto, et al.. (2002). Complete optical sampling system with broad gap-free spectral range for 160 Gbit/s and 320 Gbit/s and its application in a transmission system. 528–528. 8 indexed citations

10.

Diez, Stefan, Colja Schubert, U. Feiste, et al.. (2000). 160 Gb/s All-Optical Demultiplexing using aGain-Transparent Ultrafast-Nonlinear Interferometer. 9 indexed citations

11.

Ludwig, R., Stefan Diez, & H.G. Weber. (1998). A Novel All-Optical Switch for Demultiplexing in OTDM-Systems demonstrated in a 640Gbit/s WDM/TDM Experiment. Optical Fiber Communication Conference. 2 indexed citations

12.

Schmidt, Christian, Stefan Diez, R. Ludwig, & H. Weber. (1997). Picosecond Pulse Train Switching by Four-Wave Mixing in Semiconductor-Laser Amplifiers. PFB5–PFB5. 2 indexed citations

13.

Koltchanov, Igor, et al.. (1996). Characterization of terahertz four-wave mixing in a semiconductor laser amplifier. Conference on Lasers and Electro-Optics. 105–106. 5 indexed citations

14.

Ludwig, R., R. Schnabel, H.G. Weber, & J. M. Wiesenfeld. (1995). Four-wave mixing and asymmetric nonlinear gain in a semiconductor-laser amplifier. Publikationsdatenbank der Fraunhofer-Gesellschaft (Fraunhofer-Gesellschaft). 1 indexed citations

15.

Pieper, W., et al.. (1993). Multiterahertz frequency conversion of a picosecond pulse train using nonlinear gain dynamics in a 1.5 μm MQW semiconductor laser amplifier. Electronics Letters. 29(9). 821–822. 12 indexed citations

16.

Großkopf, G., et al.. (1991). Frequency Conversion by Four-Wave-Mixing in Semiconductor Laser Amplifiers: How to relax the filter problem?. WB3–WB3. 2 indexed citations

17.

Ludwig, R., R. Schnabel, N. Schunk, & H.G. Weber. (1990). Multi-Section Semiconductor Laser Structures for Optical Traveling Wave Amplifiers. Optical Amplifiers and Their Applications. ME4–ME4. 1 indexed citations

18.

Großkopf, G., R. Ludwig, R. Schnabel, & H. Weber. (1989). Characteristics of semiconductor laser optical amplifier as phase modulator. Electronics Letters. 25(17). 1188–1189. 11 indexed citations

19.

Ludwig, R., et al.. (1989). Resolution limits of optical methods for the defectinspection of lithography masks. Microelectronic Engineering. 9(1-4). 425–428. 3 indexed citations

20.

Masuoka, E., et al.. (1983). The application of remote sensing in geobotanical exploration for metal sulfides. Pages. 4 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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