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Nagy, Lotte

Lotte Nagy

M. Sc.

Research staff member
Institute of Electrical and Optical Communications
Optics group

Contact

+49 711 685 67920
+49 711 685 67900
Email

Pfaffenwaldring 47
70569 Stuttgart
Germany
Room: 2.411

Subject

As part of the photonics group, my responsibilities lie in the design of integrated components for optical data transmission. In addition to the development of passive devices, my main interest is the development of electro-optic modulators in the silicon platform.

Polarization splitting grating coupler
Sub-wavelength waveguide
Electro-optical modulators

Publications

2019
1. N. Hoppe, L. Kauke, L. Rathgeber, T. Föhn, W. Vogel, and M. Berroth, “Improved Optical 1xN On-Chip-Switches Based on Generalized Mach-Zehnder Interferometers,” in International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Ottawa, Canada, 2019, p. MP04, pp. 27–28.
  Abstract
  We present a theoretical study of 1xN optical routing networks consisting of generalized Mach-Zehnder switches, that are based on multimode interferometers. This work gives a brief overview of the necessary phase conditions and resulting phase shifter requirements in the 1xN switches. Using the presented approach as 1x4 switch with parallel phase shifters, a 20\% phaseshifter-loss reduction becomes possible.
  BibTeX
  @inproceedings{Hoppe.2019, abstract = {We present a theoretical study of 1xN optical routing networks consisting of generalized Mach-Zehnder switches, that are based on multimode interferometers. This work gives a brief overview of the necessary phase conditions and resulting phase shifter requirements in the 1xN switches. Using the presented approach as 1x4 switch with parallel phase shifters, a 20{\%} phaseshifter-loss reduction becomes possible.}, address = {Ottawa, Canada}, author = {Hoppe, Niklas and Kauke, Leonie and Rathgeber, Lotte and Föhn, Thomas and Vogel, Wolfgang and Berroth, Manfred}, booktitle = {International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)}, doi = {10.1109/NUSOD.2019.8806903}, isbn = {9781728116464}, pages = {MP04, pp. 27-28}, title = {Improved Optical 1xN On-Chip-Switches Based on Generalized Mach-Zehnder Interferometers}, year = 2019 }
  DOI
  10.1109/NUSOD.2019.8806903
2. N. Hoppe, R. H. Klenk, L. Rathgeber, W. Vogel, and M. Berroth, “Bandwidth-Enhancement of Silicon Grating Couplers Using Dispersive Coatings,” in International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Ottawa, Canada, 2019, p. MP01, pp. 21–22.
  Abstract
  The design of a highly efficient fiber-to-chip link using a silicon grating coupler with an enhanced optical bandwidth in a 250 nm silicon-on-insulator platform is presented. Consisting of a standard grating coupler with backside mirror and a special dispersive coating, this link offers a simple design and an enhanced 1-dB-bandwidth. Special attention is paid to the influence of the coatingdispersion on bandwidth. Optical simulations demonstrate the performance of the fiber-to-chip links at a wavelength of about 1550 nm and for the transverse electric waveguide mode.
  BibTeX
  @inproceedings{Hoppe.2019b, abstract = {The design of a highly efficient fiber-to-chip link using a silicon grating coupler with an enhanced optical bandwidth in a 250 nm silicon-on-insulator platform is presented. Consisting of a standard grating coupler with backside mirror and a special dispersive coating, this link offers a simple design and an enhanced 1-dB-bandwidth. Special attention is paid to the influence of the coatingdispersion on bandwidth. Optical simulations demonstrate the performance of the fiber-to-chip links at a wavelength of about 1550 nm and for the transverse electric waveguide mode.}, address = {Ottawa, Canada}, author = {Hoppe, Niklas and Klenk, Rouven H. and Rathgeber, Lotte and Vogel, Wolfgang and Berroth, Manfred}, booktitle = {International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)}, doi = {10.1109/NUSOD.2019.8806940}, isbn = {9781728116464}, pages = {MP01, pp. 21-22}, title = {Bandwidth-Enhancement of Silicon Grating Couplers Using Dispersive Coatings}, year = 2019 }
  DOI
  10.1109/NUSOD.2019.8806940
3. N. Hoppe, W. Sfar Zaoui, L. Rathgeber, Y. Wang, R. H. Klenk, W. Vogel, M. Kaschel, S. L. Portalupi, J. Burghartz, and M. Berroth, “Ultra-Efficient Silicon-on-Insulator Grating Couplers with Backside Metal Mirrors,” IEEE Journal of Selected Topics in Quantum Electronics, pp. 1--6, 2019.
  Abstract
  Coupling of light from off-chip into highly complex silicon-based devices is currently focus of efforts and research. In this work, the experimental demonstration of a -0.50 dB (89%) coupling efficiency in the C-band with the help of an aperiodic grating coupler design in a 250 nm silicon-on-insulator (SOI) technology is shown. Further, this work reports about the latest results regarding focusing grating couplers with footprints of only 30 µm x 30 µm and a measured coupling efficiency of up to 0.93~dB (81\%) at 1549 nm. Efficient grating coupler arrays are realized by using an expanded backside metal mirror-strip for the application of fiber arrays. In addition, this work presents aperiodic silicon grating couplers with an enhanced bandwidth to overcome the limited usability of grating couplers in wavelength division multiplexing (WDM) systems.
  BibTeX
  @article{Hoppe.2019, abstract = {Coupling of light from off-chip into highly complex silicon-based devices is currently focus of efforts and research. In this work, the experimental demonstration of a -0.50 dB (89%) coupling efficiency in the C-band with the help of an aperiodic grating coupler design in a 250 nm silicon-on-insulator (SOI) technology is shown. Further, this work reports about the latest results regarding focusing grating couplers with footprints of only 30 µm x 30 µm and a measured coupling efficiency of up to 0.93~dB (81{\%}) at 1549 nm. Efficient grating coupler arrays are realized by using an expanded backside metal mirror-strip for the application of fiber arrays. In addition, this work presents aperiodic silicon grating couplers with an enhanced bandwidth to overcome the limited usability of grating couplers in wavelength division multiplexing (WDM) systems.}, author = {Hoppe, Niklas and {Sfar Zaoui}, Wissem and Rathgeber, Lotte and Wang, Yun and Klenk, Rouven H. and Vogel, Wolfgang and Kaschel, Mathias and Portalupi, Simone L. and Burghartz, Joachim and Berroth, Manfred}, doi = {10.1109/JSTQE.2019.2935296}, issn = {1077-260X}, journal = {IEEE Journal of Selected Topics in Quantum Electronics}, pages = {1--6}, title = {Ultra-Efficient Silicon-on-Insulator Grating Couplers with Backside Metal Mirrors}, year = 2019 }
  DOI
  10.1109/JSTQE.2019.2935296
2018
1. L. Rathgeber, N. Hoppe, J. Finkbeiner, T. Föhn, W. Vogel, and M. Berroth, “Tuneable Optical Devices Using Subwavelength Structures,” in Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC), Aachen, Germany, 2018.
  - BibTeX
  BibTeX
  @inproceedings{Rathgeber.2018, address = {Aachen, Germany}, author = {Rathgeber, Lotte and Hoppe, Niklas and Finkbeiner, Jakob and F{\"o}hn, Thomas and Vogel, Wolfgang and Berroth, Manfred}, booktitle = {Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC)}, title = {Tuneable Optical Devices Using Subwavelength Structures}, year = 2018 }
2. N. Hoppe, W. Vogel, L. Rathgeber, T. Föhn, M. Félix Rosa, M. Kaschel, and M. Berroth, “Low-loss Silicon Photonics Platform for Optical Mode Engineering,” in European Conference on Integrated Optics (ECIO), Valencia, Spain, 2018, pp. 203–205.
  - BibTeX
  BibTeX
  @inproceedings{Hoppe.2018, address = {Valencia, Spain}, author = {Hoppe, Niklas and Vogel, Wolfgang and Rathgeber, Lotte and F{\"o}hn, Thomas and {F{\'e}lix Rosa}, Mar{\'i}a and Kaschel, Mathias and Berroth, Manfred}, booktitle = {European Conference on Integrated Optics (ECIO)}, isbn = {978-84-09-20653-1}, pages = {pp. 203-205}, title = {Low-loss Silicon Photonics Platform for Optical Mode Engineering}, year = 2018 }
2017
1. N. Hoppe, M. Haug, W. Vogel, M. Félix Rosa, T. Föhn, L. Rathgeber, and M. Berroth, “Packaging process for efficient coupling using a grating coupler with backside mirror,” in International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Copenhagen, Denmark, 2017, pp. 151--152.
  - BibTeX
  - DOI
  BibTeX
  @inproceedings{Hoppe.2017, address = {Copenhagen, Denmark}, author = {Hoppe, Niklas and Haug, Manuel and Vogel, Wolfgang and {F{\'e}lix Rosa}, Mar{\'i}a and F{\"o}hn, Thomas and Rathgeber, Lotte and Berroth, Manfred}, booktitle = {International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)}, doi = {10.1109/NUSOD.2017.8010036}, isbn = {9781509053223}, pages = {pp. 151--152}, title = {Packaging process for efficient coupling using a grating coupler with backside mirror}, year = 2017 }
  DOI
  10.1109/NUSOD.2017.8010036
2. M. Félix Rosa, P. De La Torre Castro, N. Hoppe, L. Rathgeber, W. Vogel, and M. Berroth, “Novel design of two-dimensional grating couplers with backside metal mirror in 250 nm silicon-on-insulator,” in International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Copenhagen, Denmark, 2017, pp. 81--82.
  - BibTeX
  - DOI
  BibTeX
  @inproceedings{FelixRosa.2017, address = {Copenhagen, Denmark}, author = {{F{\'e}lix Rosa}, Mar{\'i}a and {De La Torre Castro}, Pablo and Hoppe, Niklas and Rathgeber, Lotte and Vogel, Wolfgang and Berroth, Manfred}, booktitle = {International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)}, doi = {10.1109/NUSOD.2017.8010001}, isbn = {9781509053223}, pages = {pp. 81--82}, title = {Novel design of two-dimensional grating couplers with backside metal mirror in 250 nm silicon-on-insulator}, year = 2017 }
  DOI
  10.1109/NUSOD.2017.8010001
3. N. Hoppe, M. Haug, T. Polder, M. Félix Rosa, W. Vogel, P. Scheck, L. Rathgeber, D. Widmann, and M. Berroth, “Sealed and Compact Fiber Links to Integrated Photonics Using Grating Couplers,” in IEEE International Conference on Group IV Photonics, Berlin, Germany, 2017, pp. 139--140.
  - BibTeX
  - DOI
  BibTeX
  @inproceedings{Hoppe.2017c, address = {Berlin, Germany}, author = {Hoppe, Niklas and Haug, Manuel and Polder, Thomas and {F{\'e}lix Rosa}, Mar{\'i}a and Vogel, Wolfgang and Scheck, Pascal and Rathgeber, Lotte and Widmann, Daniel and Berroth, Manfred}, booktitle = {IEEE International Conference on Group IV Photonics}, doi = {10.1109/GROUP4.2017.8082235}, isbn = {978-1-5090-6568-4}, pages = {pp. 139--140}, title = {Sealed and Compact Fiber Links to Integrated Photonics Using Grating Couplers}, year = 2017 }
  DOI
  10.1109/GROUP4.2017.8082235
4. F. Dreyer, N. Hoppe, J. Köhler, W. Vogel, M. Dahlinger, M. Félix Rosa, L. Rathgeber, J. Werner, and M. Berroth, “Schottky-Fotodioden basierend auf laserkristallisierten Germanium-Schichten,” in Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V, Miltenberg, Germany, 2017, pp. KH2017-Di-D2-04.
  - BibTeX
  BibTeX
  @inproceedings{Dreyer.2017, address = {Miltenberg, Germany}, author = {Dreyer, Frederik and Hoppe, Niklas and K{\"o}hler, J{\"u}rgen and Vogel, Wolfgang and Dahlinger, Morris and {F{\'e}lix Rosa}, Mar{\'i}a and Rathgeber, Lotte and Werner, J{\"u}rgen and Berroth, Manfred}, booktitle = {Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V}, pages = {KH2017-Di-D2-04}, title = {Schottky-Fotodioden basierend auf laserkristallisierten Germanium-Schichten}, year = 2017 }
5. N. Hoppe, P. Diersing, T. Föhn, M. Kaschel, T. Polder, W. Vogel, L. Rathgeber, M. Félix Rosa, and M. Berroth, “Integrated Dual-Mode Interferometer with Differential Single-Mode Outputs,” in European Conference on Integrated Optics (ECIO), Eindhoven, The Netherlands, 2017, p. MP1.3.
  - BibTeX
  - Link
  BibTeX
  @inproceedings{Hoppe.2017b, address = {Eindhoven, The Netherlands}, author = {Hoppe, Niklas and Diersing, Philipp and F{\"o}hn, Thomas and Kaschel, Mathias and Polder, Thomas and Vogel, Wolfgang and Rathgeber, Lotte and {F{\'e}lix Rosa}, Mar{\'i}a and Berroth, Manfred}, booktitle = {European Conference on Integrated Optics (ECIO)}, pages = {MP1.3}, title = {Integrated Dual-Mode Interferometer with Differential Single-Mode Outputs}, url = {https://www.ecio-conference.org/wp-content/uploads/2017/03/ECIO_2017_MP1.3.pdf}, year = 2017 }
  Link
  https://www.ecio-conference.org/wp-content/uploads/2017/03/ECIO_2017_MP1.3.pdf
6. N. Hoppe, P. Scheck, R. Sweidan, P. Diersing, L. Rathgeber, W. Vogel, B. Riegger, A. Southan, and M. Berroth, “Silicon Integrated Dual-Mode Interferometer with Differential Outputs: Special Issue Biophotonic Sensors and Applications,” Biosensors, vol. 7, no. 3, p. 37, 2017.
  Abstract
  The dual-mode interferometer (DMI) is an attractive alternative to Mach-Zehnder interferometers for sensor purposes, achieving sensitivities to refractive index changes close to state-of-the-art. Modern designs on silicon-on-insulator (SOI) platforms offer thermally stable and compact devices with insertion losses of less than 1 dB and high extinction ratios. Compact arrays of multiple DMIs in parallel are easy to fabricate due to the simple structure of the DMI. In this work, the principle of operation of an integrated DMI with differential outputs is presented which allows the unambiguous phase shift detection with a single wavelength measurement, rather than using a wavelength sweep and evaluating the optical output power spectrum. Fluctuating optical input power or varying attenuation due to different analyte concentrations can be compensated by observing the sum of the optical powers at the differential outputs. DMIs with two differential single-mode outputs are fabricated in a 250 nm SOI platform, and corresponding measurements are shown to explain the principle of operation in detail. A comparison of DMIs with the conventional Mach-Zehnder interferometer using the same technology concludes this work.
  BibTeX
  @article{Hoppe.2017c, abstract = {The dual-mode interferometer (DMI) is an attractive alternative to Mach-Zehnder interferometers for sensor purposes, achieving sensitivities to refractive index changes close to state-of-the-art. Modern designs on silicon-on-insulator (SOI) platforms offer thermally stable and compact devices with insertion losses of less than 1 dB and high extinction ratios. Compact arrays of multiple DMIs in parallel are easy to fabricate due to the simple structure of the DMI. In this work, the principle of operation of an integrated DMI with differential outputs is presented which allows the unambiguous phase shift detection with a single wavelength measurement, rather than using a wavelength sweep and evaluating the optical output power spectrum. Fluctuating optical input power or varying attenuation due to different analyte concentrations can be compensated by observing the sum of the optical powers at the differential outputs. DMIs with two differential single-mode outputs are fabricated in a 250 nm SOI platform, and corresponding measurements are shown to explain the principle of operation in detail. A comparison of DMIs with the conventional Mach-Zehnder interferometer using the same technology concludes this work.}, author = {Hoppe, Niklas and Scheck, Pascal and Sweidan, Rami and Diersing, Philipp and Rathgeber, Lotte and Vogel, Wolfgang and Riegger, Benjamin and Southan, Alexander and Berroth, Manfred}, doi = {10.3390/bios7030037}, issn = {2079-6374}, journal = {Biosensors}, number = 3, pages = 37, title = {Silicon Integrated Dual-Mode Interferometer with Differential Outputs: Special Issue Biophotonic Sensors and Applications}, url = {https://www.mdpi.com/2079-6374/7/3/37}, volume = 7, year = 2017 }
  Link
  https://www.mdpi.com/2079-6374/7/3/37
  DOI
  10.3390/bios7030037
7. N. Hoppe, C. Rothe, A. Celik, M. Félix Rosa, W. Vogel, D. Widmann, L. Rathgeber, M. del C. Ruiz Delgado, B. Villacampa, S. Ludwigs, and M. Berroth, “Single waveguide silicon-organic hybrid modulator,” Advances in Radio Science, vol. 15, pp. 141--147, 2017.
  BibTeX
  @article{Hoppe.2017b, author = {Hoppe, Niklas and Rothe, Christian and Celik, Arda and {F{\'e}lix Rosa}, Mar{\'i}a and Vogel, Wolfgang and Widmann, Daniel and Rathgeber, Lotte and {Ruiz Delgado}, Maria del Carmen and Villacampa, Belen and Ludwigs, Sabine and Berroth, Manfred}, doi = {10.5194/ars-15-141-2017}, issn = {1684-9973}, journal = {Advances in Radio Science}, pages = {141--147}, title = {Single waveguide silicon-organic hybrid modulator}, url = {https://www.adv-radio-sci.net/15/141/2017/}, volume = 15, year = 2017 }
  Link
  https://www.adv-radio-sci.net/15/141/2017/
  DOI
  10.5194/ars-15-141-2017
8. M. Félix Rosa, L. Rathgeber, R. Elster, N. Hoppe, T. Föhn, M. Schmidt, W. Vogel, and M. Berroth, “Design of a carrier-depletion Mach-Zehnder modulator in 250 nm silicon-on-insulator technology,” Advances in Radio Science, vol. 15, pp. 269--281, 2017.
  BibTeX
  @article{FelixRosa.2017, author = {{F{\'e}lix Rosa}, Mar{\'i}a and Rathgeber, Lotte and Elster, Raik and Hoppe, Niklas and F{\"o}hn, Thomas and Schmidt, Martin and Vogel, Wolfgang and Berroth, Manfred}, doi = {10.5194/ars-15-269-2017}, issn = {1684-9973}, journal = {Advances in Radio Science}, pages = {269--281}, title = {Design of a carrier-depletion Mach-Zehnder modulator in 250 nm silicon-on-insulator technology}, url = {https://www.adv-radio-sci.net/15/269/2017/ars-15-269-2017.pdf}, volume = 15, year = 2017 }
  Link
  https://www.adv-radio-sci.net/15/269/2017/ars-15-269-2017.pdf
  DOI
  10.5194/ars-15-269-2017
2016
1. W. Sfar Zaoui, L. Rathgeber, T. Föhn, W. Vogel, and M. Berroth, “Tuneable Grating Coupler with High Efficiency,” in Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC), Changchun, China, 2016, p. 52.
  - BibTeX
  BibTeX
  @inproceedings{SfarZaoui.2016, address = {Changchun, China}, author = {Sfar Zaoui, Wissem and Rathgeber, Lotte and Föhn, Thomas and Vogel, Wolfgang and Berroth, Manfred}, booktitle = {Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC)}, pages = {p. 52}, title = {Tuneable Grating Coupler with High Efficiency}, year = 2016 }
2. W. Vogel, T. Föhn, N. Hoppe, M. Félix Rosa, and L. Rathgeber, “Siliziumphotonik für Datacom-Anwendungen,” presented at Workshop Photonics , IMS Chips, Stuttgart, Germany, 2016.
  - BibTeX
  BibTeX
  @conference{Vogel.2016, address = {presented at Workshop Photonics , IMS Chips, Stuttgart, Germany}, author = {Vogel, Wolfgang and Föhn, Thomas and Hoppe, Niklas and {Félix Rosa}, María and Rathgeber, Lotte}, institutions = {{IMS Chips}}, title = {Siliziumphotonik für Datacom-Anwendungen}, year = 2016 }
3. M. Félix Rosa, L. Rathgeber, T. Föhn, N. Hoppe, M. Schmidt, W. Vogel, M. Berroth, and M. Kaschel, “Design and Simulation of Silicon Optical Modulators in Silicon-on-Insulator Technology,” in Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V, Miltenberg, Germany, 2016, pp. KH2016-D-11.
  - BibTeX
  BibTeX
  @inproceedings{FelixRosa.2016, address = {Miltenberg, Germany}, author = {{F{\'e}lix Rosa}, Mar{\'i}a and Rathgeber, Lotte and F{\"o}hn, Thomas and Hoppe, Niklas and Schmidt, Martin and Vogel, Wolfgang and Berroth, Manfred and Kaschel, Mathias}, booktitle = {Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V}, pages = {KH2016-D-11}, title = {Design and Simulation of Silicon Optical Modulators in Silicon-on-Insulator Technology}, year = 2016 }
4. N. Hoppe, C. Rothe, T. Föhn, M. Félix Rosa, L. Rathgeber, W. Vogel, S. Ludwigs, and M. Berroth, “Zweimoden-Interferometer in optischen organischen Silizium-Hybrid-Modulatoren,” in Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V, Miltenberg, Germany, 2016, pp. KH2016-D-12.
  - BibTeX
  BibTeX
  @inproceedings{Hoppe.2016, address = {Miltenberg, Germany}, author = {Hoppe, Niklas and Rothe, Christian and F{\"o}hn, Thomas and {F{\'e}lix Rosa}, Mar{\'i}a and Rathgeber, Lotte and Vogel, Wolfgang and Ludwigs, Sabine and Berroth, Manfred}, booktitle = {Kleinheubacher Tagung, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V}, pages = {KH2016-D-12}, title = {Zweimoden-Interferometer in optischen organischen Silizium-Hybrid-Modulatoren}, year = 2016 }
2013
1. A. Bräckle, L. Rathgeber, F. Siegert, S. Heck, and M. Berroth, “Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator,” Advances in Radio Science, vol. 11, pp. 207--212, 2013.
  - BibTeX
  - DOI
  BibTeX
  @article{Brackle.2013, author = {Br{\"a}ckle, Alexander and Rathgeber, Lotte and Siegert, Florian and Heck, Stefan and Berroth, Manfred}, doi = {10.5194/ars-11-207-2013}, issn = {1684-9973}, journal = {Advances in Radio Science}, pages = {207--212}, title = {Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator}, volume = 11, year = 2013 }
  DOI
  10.5194/ars-11-207-2013
2012
1. A. Bräckle, L. Rathgeber, F. Siegert, S. Heck, and M. Berroth, “Power supply modulation for RF applications,” in International Power Electronics and Motion Control Conference (EPE-PEMC), Novi Sad, Serbia, 2012, p. LS8d.3-1-LS8d.3-5.
  - BibTeX
  - DOI
  BibTeX
  @inproceedings{Brackle.2012b, address = {Novi Sad, Serbia}, author = {Br{\"a}ckle, Alexander and Rathgeber, Lotte and Siegert, Florian and Heck, Stefan and Berroth, Manfred}, booktitle = {International Power Electronics and Motion Control Conference (EPE-PEMC)}, doi = {10.1109/EPEPEMC.2012.6397531}, pages = {LS8d.3-1-LS8d.3-5}, title = {Power supply modulation for RF applications}, year = 2012 }
  DOI
  10.1109/EPEPEMC.2012.6397531

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