J. von der Weid - Academia.edu (original) (raw)

Papers by J. von der Weid

Research paper thumbnail of Low-pump-power, short-fiber copropagating dual-pumped (800 and 1050nm) thulium-doped fiber amplifier

Optics Letters, 2003

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Research paper thumbnail of Low pump power, short-fiber dual-pumped (800 nm+1050 nm) TDFA

OFC 2003 Optical Fiber Communications Conference, 2003., 2003

Page 1. 632 / VOL. 2 / OFC 2003 / FRIDAY MORNING Frida y, Marc h 28 FB5 9:00 AM Low Pump Power, S... more Page 1. 632 / VOL. 2 / OFC 2003 / FRIDAY MORNING Frida y, Marc h 28 FB5 9:00 AM Low Pump Power, Short-Fiber Dual-Pumped (800 nm + 1050 nm) TDFA A. Gomes, M. Carvalho, M. Sundheimer, C. Bastos-Filho, J. Martins ...

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Research paper thumbnail of Tunable OTDR in Raman-amplified optical transmissions

The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004., 2004

OTDR in the S-, C- and L-bands shows that amplified Rayleigh scattering echoes are more important... more OTDR in the S-, C- and L-bands shows that amplified Rayleigh scattering echoes are more important than double Rayleigh scattering for return losses above -60 dB in forward pumping configurations. Gain depletion can give rise to 2 dB OTDR errors at high gain.

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Research paper thumbnail of <title>Comparative analysis of interferometric measurements of PMD on optical fibers</title>

Optical Measurement Systems for Industrial Inspection VII, 2011

Polarization modes dispersion (PMD) is one of the major factors that impose restrictions in the s... more Polarization modes dispersion (PMD) is one of the major factors that impose restrictions in the speed of optical communication links and some efforts must be done in order to properly quantify this effect. In this way we develop studies on the behavior of such a phenomenon, critical when light is transmitted through long optical fibers. The focus in this paper

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Research paper thumbnail of Distributed-gain and optimum length of erbium-doped fibre amplifiers

24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), 1998

The distributed-gain along erbium doped fibres was measured with coherent optical frequency-domai... more The distributed-gain along erbium doped fibres was measured with coherent optical frequency-domain reflectometry. The optimum length for different amplifier specifications were measured and compared to the cutback technique

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Research paper thumbnail of Fiber Bragg grating polarizer

Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678), 2003

An optical fiber polarizer is constructed with a fiber Bragg grating (FBG) based on birefringence... more An optical fiber polarizer is constructed with a fiber Bragg grating (FBG) based on birefringence effects induced by a transverse force applied to a section of the grating. In this work we present the principle of operation and experimental results of this device. We show how this fiber polarizer can be used in transmission mode if the affected region of

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Research paper thumbnail of Two-Way Quantum Communication in a Single Optical Fiber with Active Polarization Compensation

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

... GB Xavier1, G. Vilela de Faria1, T. Ferreira da Silva1,2, GP Temporão1, and JP von der Weid1 ... more ... GB Xavier1, G. Vilela de Faria1, T. Ferreira da Silva1,2, GP Temporão1, and JP von der Weid1 ... Most quantum communication [1] experiments to date have used a dark optical fiber link for the transmission of qubits between Alice and Bob [2-5]. For a broader inser-tion of ...

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Research paper thumbnail of Fully powered-over-fibre remote antenna unit

2008 International Topical Meeting on Microwave Photonics jointly held with the 2008 Asia-Pacific Microwave Photonics Conference, 2008

In order to achieve a reliable ROF system with centralized wavelength operation, it is essential ... more In order to achieve a reliable ROF system with centralized wavelength operation, it is essential to provide enough power for remote antenna unit without the need of copper wires or any kind of batteries. Moreover, to ensure a high quality full-duplex communication when heterodyne generation is employed to obtain the microwave signal, a carefully choice of the laser sources is

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Research paper thumbnail of Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Journal of Lightwave Technology, 2014

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Research paper thumbnail of Nondestructive evaluation of glued joints in nonmetallic samples using THz waves

2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves, 2012

ABSTRACT The quality of glued joints in nonmetallic samples was evaluated using a standard THz-TD... more ABSTRACT The quality of glued joints in nonmetallic samples was evaluated using a standard THz-TDS system in the transmission configuration. Our results show that THz waves can indeed become a powerful tool for NDE of nonmetallic industrial equipment.

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Research paper thumbnail of Fast broadband swept source for optical coherence tomography

2009 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2009

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Research paper thumbnail of BER fluctuations due to combined PMD, PDL and frequency chirp in optical transmissions

IEE Proceedings - Optoelectronics, 2006

ABSTRACT Measurements of fluctuations in the bit error rates of 2.5 and 10 Gbit/s optical transmi... more ABSTRACT Measurements of fluctuations in the bit error rates of 2.5 and 10 Gbit/s optical transmission through a concatenation of polarisation mode dispersion (PMD) and polarisation-dependent loss (PDL) elements are presented. The result confirms that combined PMD+PDL effects introduce fluctuations larger than those estimated by simple root mean squared sum rules. When frequency-chirped optical sources are used, power penalties due to the combined effect of PMD and PDL are significantly increased

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Research paper thumbnail of Distributed gain and spectral gain-saturation effects in erbium doped fibers

1999 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, 1999

Distributed gain and spectral gain-saturation effects of erbium-doped fiber amplifier (EDFA) were... more Distributed gain and spectral gain-saturation effects of erbium-doped fiber amplifier (EDFA) were measured using a coherent reflectrometry technique. We find that the spectral performance can be improved if the gain needs are relaxed. A hole in the spectral dependence of the gain depletion was also observed, which could be related to the Spectral Hole Burning (SHB) phenomenon

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Research paper thumbnail of Safeguarding Quantum Key Distribution Through Detection Randomization

IEEE Journal of Selected Topics in Quantum Electronics, 2015

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Research paper thumbnail of Polarization-mode interferometry in birefringent single-mode fibers

Optics Letters, 1987

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Research paper thumbnail of Low-pump-power, short-fiber copropagating dual-pumped (800 and 1050nm) thulium-doped fiber amplifier

Optics Letters, 2003

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Research paper thumbnail of Stable single-photon interference in a 1 km fiber-optic Mach–Zehnder interferometer with continuous phase adjustment

Optics Letters, 2011

We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km lon... more We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km long fiber-optic Mach-Zehnder interferometer, using an active phase control system with the feedback provided by a classical laser. We are able to continuously tune the single-photon phase difference between the interferometer arms using a phase modulator, which is synchronized with the gate window of the single-photon detectors. The phase control system employs a piezoelectric fiber stretcher to stabilize the phase drift in the interferometer. A single-photon net visibility of 0.97 is obtained, yielding future possibilities for experimental realizations of quantum repeaters in optical fibers and violation of Bell&#39;s inequalities using genuine energy-time entanglement.

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Research paper thumbnail of Phase measurements on terahertz waves

Optics Letters, 2013

The change in phase of the free space terahertz (THz) electric field as a sample of material intr... more The change in phase of the free space terahertz (THz) electric field as a sample of material introduced into the THz beampath of a CW THz system is measured and used to calculate the index of refraction of materials at 250 GHz.

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Research paper thumbnail of Full polarization control for fiber optical quantum communication systems using polarization encoding

Optics Express, 2008

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Research paper thumbnail of Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

New Journal of Physics, 2009

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Research paper thumbnail of Low-pump-power, short-fiber copropagating dual-pumped (800 and 1050nm) thulium-doped fiber amplifier

Optics Letters, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Low pump power, short-fiber dual-pumped (800 nm+1050 nm) TDFA

OFC 2003 Optical Fiber Communications Conference, 2003., 2003

Page 1. 632 / VOL. 2 / OFC 2003 / FRIDAY MORNING Frida y, Marc h 28 FB5 9:00 AM Low Pump Power, S... more Page 1. 632 / VOL. 2 / OFC 2003 / FRIDAY MORNING Frida y, Marc h 28 FB5 9:00 AM Low Pump Power, Short-Fiber Dual-Pumped (800 nm + 1050 nm) TDFA A. Gomes, M. Carvalho, M. Sundheimer, C. Bastos-Filho, J. Martins ...

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Research paper thumbnail of Tunable OTDR in Raman-amplified optical transmissions

The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004., 2004

OTDR in the S-, C- and L-bands shows that amplified Rayleigh scattering echoes are more important... more OTDR in the S-, C- and L-bands shows that amplified Rayleigh scattering echoes are more important than double Rayleigh scattering for return losses above -60 dB in forward pumping configurations. Gain depletion can give rise to 2 dB OTDR errors at high gain.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Comparative analysis of interferometric measurements of PMD on optical fibers</title>

Optical Measurement Systems for Industrial Inspection VII, 2011

Polarization modes dispersion (PMD) is one of the major factors that impose restrictions in the s... more Polarization modes dispersion (PMD) is one of the major factors that impose restrictions in the speed of optical communication links and some efforts must be done in order to properly quantify this effect. In this way we develop studies on the behavior of such a phenomenon, critical when light is transmitted through long optical fibers. The focus in this paper

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Distributed-gain and optimum length of erbium-doped fibre amplifiers

24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), 1998

The distributed-gain along erbium doped fibres was measured with coherent optical frequency-domai... more The distributed-gain along erbium doped fibres was measured with coherent optical frequency-domain reflectometry. The optimum length for different amplifier specifications were measured and compared to the cutback technique

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fiber Bragg grating polarizer

Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678), 2003

An optical fiber polarizer is constructed with a fiber Bragg grating (FBG) based on birefringence... more An optical fiber polarizer is constructed with a fiber Bragg grating (FBG) based on birefringence effects induced by a transverse force applied to a section of the grating. In this work we present the principle of operation and experimental results of this device. We show how this fiber polarizer can be used in transmission mode if the affected region of

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Two-Way Quantum Communication in a Single Optical Fiber with Active Polarization Compensation

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2010

... GB Xavier1, G. Vilela de Faria1, T. Ferreira da Silva1,2, GP Temporão1, and JP von der Weid1 ... more ... GB Xavier1, G. Vilela de Faria1, T. Ferreira da Silva1,2, GP Temporão1, and JP von der Weid1 ... Most quantum communication [1] experiments to date have used a dark optical fiber link for the transmission of qubits between Alice and Bob [2-5]. For a broader inser-tion of ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fully powered-over-fibre remote antenna unit

2008 International Topical Meeting on Microwave Photonics jointly held with the 2008 Asia-Pacific Microwave Photonics Conference, 2008

In order to achieve a reliable ROF system with centralized wavelength operation, it is essential ... more In order to achieve a reliable ROF system with centralized wavelength operation, it is essential to provide enough power for remote antenna unit without the need of copper wires or any kind of batteries. Moreover, to ensure a high quality full-duplex communication when heterodyne generation is employed to obtain the microwave signal, a carefully choice of the laser sources is

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Journal of Lightwave Technology, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nondestructive evaluation of glued joints in nonmetallic samples using THz waves

2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves, 2012

ABSTRACT The quality of glued joints in nonmetallic samples was evaluated using a standard THz-TD... more ABSTRACT The quality of glued joints in nonmetallic samples was evaluated using a standard THz-TDS system in the transmission configuration. Our results show that THz waves can indeed become a powerful tool for NDE of nonmetallic industrial equipment.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fast broadband swept source for optical coherence tomography

2009 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of BER fluctuations due to combined PMD, PDL and frequency chirp in optical transmissions

IEE Proceedings - Optoelectronics, 2006

ABSTRACT Measurements of fluctuations in the bit error rates of 2.5 and 10 Gbit/s optical transmi... more ABSTRACT Measurements of fluctuations in the bit error rates of 2.5 and 10 Gbit/s optical transmission through a concatenation of polarisation mode dispersion (PMD) and polarisation-dependent loss (PDL) elements are presented. The result confirms that combined PMD+PDL effects introduce fluctuations larger than those estimated by simple root mean squared sum rules. When frequency-chirped optical sources are used, power penalties due to the combined effect of PMD and PDL are significantly increased

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Distributed gain and spectral gain-saturation effects in erbium doped fibers

1999 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, 1999

Distributed gain and spectral gain-saturation effects of erbium-doped fiber amplifier (EDFA) were... more Distributed gain and spectral gain-saturation effects of erbium-doped fiber amplifier (EDFA) were measured using a coherent reflectrometry technique. We find that the spectral performance can be improved if the gain needs are relaxed. A hole in the spectral dependence of the gain depletion was also observed, which could be related to the Spectral Hole Burning (SHB) phenomenon

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Safeguarding Quantum Key Distribution Through Detection Randomization

IEEE Journal of Selected Topics in Quantum Electronics, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Polarization-mode interferometry in birefringent single-mode fibers

Optics Letters, 1987

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Low-pump-power, short-fiber copropagating dual-pumped (800 and 1050nm) thulium-doped fiber amplifier

Optics Letters, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stable single-photon interference in a 1 km fiber-optic Mach–Zehnder interferometer with continuous phase adjustment

Optics Letters, 2011

We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km lon... more We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km long fiber-optic Mach-Zehnder interferometer, using an active phase control system with the feedback provided by a classical laser. We are able to continuously tune the single-photon phase difference between the interferometer arms using a phase modulator, which is synchronized with the gate window of the single-photon detectors. The phase control system employs a piezoelectric fiber stretcher to stabilize the phase drift in the interferometer. A single-photon net visibility of 0.97 is obtained, yielding future possibilities for experimental realizations of quantum repeaters in optical fibers and violation of Bell&#39;s inequalities using genuine energy-time entanglement.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Phase measurements on terahertz waves

Optics Letters, 2013

The change in phase of the free space terahertz (THz) electric field as a sample of material intr... more The change in phase of the free space terahertz (THz) electric field as a sample of material introduced into the THz beampath of a CW THz system is measured and used to calculate the index of refraction of materials at 250 GHz.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Full polarization control for fiber optical quantum communication systems using polarization encoding

Optics Express, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

New Journal of Physics, 2009

Bookmarks Related papers MentionsView impact