H. Suche

Universität Paderborn, Paderborn, North Rhine-Westphalia, Germany

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Publications (107)132.51 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Applications of packaged and pigtailed (tunable) integrated all-optical Ti:PPLN wavelength converters (AOWC) with different modulation formats (RZ-DQPSK, 16-ary QAM) are reported. The devices take advantage of cascaded second order nonlinear interactions allowing tuning with either one or two control waves via cSHG/DFG or cSFG/DFG. Operation of polarization insensitive AOWCs on a variety of presented high-bit-rate (up to 320 Gb/s) transmission experiments and mid-span chromatic dispersion compensation in the C-band with negligible penalties promises great potential for application in transparent all-optical networks (TAON). In addition recent progress with respect to bandwidth and efficiency of the cSHG/DFG-based wavelength converters is reported. The efficiency is increased by pump-resonant wavelength conversion and by increased interaction length in a phase controlled double-pass scheme.
    2014 16th International Conference on Transparent Optical Networks (ICTON); 07/2014
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    ABSTRACT: We implemented a compact integrated non-degenerate source which comprises a periodically poled waveguide with highly reflective dielectric mirror coatings to obtain narrowband photon pairs based on type II parametric down-conversion.
    CLEO: QELS_Fundamental Science; 06/2014
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    ABSTRACT: Time-frequency (TF) modes of ultrafast quantum states are naturally compatible with high bit- rate integrated quantum communication networks. Thus they offer an attractive alternative for the realization of high dimensional quantum optics. Here, we present a quantum pulse gate based on dispersion-engineered ultrafast frequency conversion in a nonlinear optical waveguide, which is a key element for harnessing the potential of TF modes. We experimentally retrieve the modal TF structure of our device and demonstrate a single-mode operation fidelity of 80%, which is limited by experimental shortcomings. In addition, we retrieve a conversion efficiency of 87.7% with a high signal-to-noise ratio of 8.8 when operating the quantum pulse gate at the single-photon level.
    03/2014;
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    ABSTRACT: Tunable optical wavelength conversion of a 40 Gb/s 16-ary quadrature amplitude modulated signal within the C-band is demonstrated by cascaded sum frequency generation and difference frequency generation in a periodically-poled lithium niobate module. System experiments with conversion efficiencies of ~ 7.5 dB (excluding module loss) are presented. Bit-error ratio measurements confirm excellent conversion performance.
    IEEE Photonics Technology Letters 11/2013; 25(21):2085-2088. · 2.04 Impact Factor
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    ABSTRACT: The liquid crystalline organic semiconductor perylene-3,4,9,10-tetracarboxylic-tetraethylester is used to create resonant cavity enhanced organic light emitting diodes. The results indicate that the emitted intensity can be increased and the emission spectrum narrowed by embedding a suitable sequence of several organic layers, including the discotic liquid crystal, with appropriate thicknesses in a microresonator consisting of a highly reflecting metal electrode and a Bragg reflector. The experimental data are in good agreement with theoretical calculations. Resonant cavity enhancement revealed to be suitable for improving the performance of liquid crystal-based electroluminescent devices.
    Applied Physics Letters 07/2013; 6(7). · 3.52 Impact Factor
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    ABSTRACT: We report on an integrated non-degenerate narrowband photon pair source produced at 890 nm and 1320nm via type II parametric down-conversion in a periodically poled waveguide with high-reflective dielectric mirrors deposited on the waveguide end faces. The conversion spectrum consists of three clusters and only 3 to 4 longitudinal modes with about 150 MHz bandwidth in each cluster. The high conversion efficiency in the waveguide, together with the spectral clustering in the double resonator, leads to a high brightness of $3\times10^3~$pairs/(s$\cdot$mW$\cdot$MHz). The compact and rugged monolithic design makes the source a versatile device for various applications in quantum communication.
    06/2013;
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    ABSTRACT: Recent progress in quantum information processing has highlighted the benefits of integrated optic devices for quantum applications (e.g.[l]). The miniaturization of systems with increased complexity drastically reduces the required space and paves the way for future commercialization.In the past five years, several groups have demonstrated promising approaches to achieve quantum interference and photonic gates on-chip (e.g.[2]). However, in all of these experiments the preparation of the photon pairs has been performed outside the integrated devices employing bulk crystal parametric down-conversion (PDC) sources, while the efficient coupling between these sources and the integrated circuit remains as a bottleneck for the design of systems with increasing complexity. On the other hand remarkable efforts have been devoted to the development of integrated PDC sources for photon pair generation inside channel waveguides [3]. The main benefits of guided-wave PDC processes include high conversion efficiencies and spatial mode control. We combine the prospects of an efficient type-I PDC source based on Titanium-indiffused periodically poled Z-cut Lithium Niobate waveguides (Ti:PPLN) with a passive wavelength division demultiplexing coupler on-chip, shown in Figure 1. The coupler allows for excellent spatial separation generated photon pairs. The non-degenerate decay of pump photons at 532 nm into signal and idler photons provides us with a photon pair at wavelengths of 1575 nm and 800 nm, respectively. Thus low-loss fiber transmission of the prepared states at 1575 nm can be accomplished on the one hand, while on the other hand efficient heralding of conditioned states can be implemented with off-the-shelf silicon-based detectors. The quality and efficiency of our source was improved by the deposition of endface-coatings. This allows for the efficient launching of pump light into the waveguide and it simultaneously provides a close-toperfect tran- mission of signal and idler at the output of our source, reflecting the pump light by more than 99%. In conditioned coincidence measurements in the picosecond pulsed regime we achieved heralding of single photons with almost no influence of background radiation, expressed by high coincidences-toaccidentals ratios up to CAR > 7400. The preparation exceeded 60% of efficiency in the low pump power regime, accompanied with ultra-low second-order correlation functions of g(2) (0) <; 4.10-3. These figures of merit in conjunction with the integration of active and passive elements make our source a candidate for a basic building block in more complex and miniaturized quantum network realizations in the future.
    Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC), 2013 Conference on and International Quantum Electronics Conference, Munich; 05/2013
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    ABSTRACT: We present a pulsed and integrated, highly non-degenerate parametric downconversion (PDC) source of heralded single photons at telecom wavelengths, paired with heralding photons around 800 nm. The active PDC section is combined with a passive, integrated wavelength division demultiplexer on-chip, which allows for the spatial separation of signal and idler photons with efficiencies of more than 96.5 %, as well as with multi-band reflection and anti-reflection coatings which facilitate low incoupling losses and a pump suppression at the output of the device of more than 99 %. Our device is capable of preparing single photons with efficiencies of 60 % with a coincidences-to-accidentals ratio exceeding 7400. Likewise it shows practically no significant background noise compared to continuous wave realizations. For low pump powers, we measure a conditioned second-order correlation function of g^(2)(0)=0.0038, which proves almost pure single photon generation. In addition, our source can feature a high brightness of =0.24 generated photon pairs per pump pulse at pump power levels below 100 uW. The high quality of the pulsed PDC process in conjunction with the integration of highly efficient passive elements makes our device a promising candidate for future quantum networking applications, where an efficient miniaturization plays a crucial role.
    New Journal of Physics 11/2012; 15(3). · 4.06 Impact Factor
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    ABSTRACT: Tunable all-optical wavelength conversion (AOWC) of a 40-Gb/s RZ-OOK data signal based on cascaded second-harmonic generation (SHG) and difference-frequency generation (DFG) in a Ti:PPLN waveguide is demonstrated. Error-free performances with negligible power penalty are achieved for the wavelength-converted signal at 1535, 1538, 1541, 1551, 1554, and 1557 nm, respectively.
    IEEE Photonics Journal 10/2012; · 2.36 Impact Factor
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    ABSTRACT: Polarization-insensitive in-line all-optical wavelength conversion (AOWC) of a single-channel 320-Gb/s RZ-DQPSK data signal in the middle of a 320-km transmission span is reported. The technique is based on a Ti:PPLN waveguide in a polarization diversity scheme. The conversion efficiency of the signal was -21 dB, which includes 9.2 dB of passive losses in the whole Ti:PPLN subsystem. Error-free performance for the in-line wavelength converted signal after 320-km transmission was successfully achieved.
    IEEE Photonics Technology Letters 06/2011; · 2.04 Impact Factor
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    ABSTRACT: Simultaneous all-optical wavelength conversion of an 80-Gb/s return-to-zero differential quadrature phase shift keying (RZ-DQPSK) data signal and a 40-Gb/s return-to-zero ON--OFF keying (RZ-OOK) data signal using a Ti:PPLN waveguide in a polarization-diversity loop configuration are demonstrated. The wavelength conversion is fully transparent to polarization, data rate, modulation format, and modulation level. The conversion efficiency for the signals was ${-}21$ dB, which includes 9.2-dB passive losses in the whole Ti:PPLN subsystem. Error-free performance for both wavelength-converted signals was achieved for polarization-scrambled input data signals without additional penalty caused by the polarization scrambling.
    Journal of Lightwave Technology 04/2011; 29(8):1092-1097. · 2.56 Impact Factor
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    ABSTRACT: Full control over the spatio-temporal structure of quantum states of light is an important goal in quantum optics, to generate for instance single-mode quantum pulses or to encode information on multiple modes, enhancing channel capacities. Quantum light pulses feature an inherent, rich spectral broadband-mode structure. In recent years, exploring the use of integrated optics as well as source-engineering has led to a deep understanding of the pulse-mode structure of guided quantum states of light. In addition, several groups have started to investigate the manipulation of quantum states by means of single-photon frequency conversion. In this paper we explore new routes towards complete control of the inherent pulse-modes of ultrafast pulsed quantum states by employing specifically designed nonlinear waveguides with adapted dispersion properties. Starting from our recently proposed quantum pulse gate (QPG) we further generalize the concept of spatio-spectral engineering for arbitrary $\chitwo$-based quantum processes. We analyse the sum-frequency generation based QPG and introduce the difference-frequency generation based quantum pulse shaper (QPS). Together, these versatile and robust integrated optics devices allow for arbitrary manipulations of the pulse-mode structure of ultrafast pulsed quantum states. The QPG can be utilized to select an arbitrary pulse mode from a multimode input state, whereas the QPS enables the generation of specific pulse modes from an input wavepacket with Gaussian-shaped spectrum.
    New Journal of Physics 01/2011; 13(6). · 4.06 Impact Factor
  • MRS Online Proceeding Library 01/2011; 201.
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    ABSTRACT: We demonstrate 160 Gbit/s return-to-zero (RZ) differential quarternary phase-shift keying (DQPSK) signal transmission over a 110 km single-mode fiber by taking advantage of mid-span optical phase conjugation (OPC). The technique is based on nonlinear wavelength conversion by cascaded second harmonic and difference frequency generation in a Ti:PPLN waveguide. Error-free operation with a negligible optical signal-to-noise ratio penalty for the signal after the OPC transmission without and with polarization scrambling was achieved. The results also show the polarization insensitivity of the OPC system using a polarization diversity scheme.
    Optics Letters 09/2010; 35(17):2867-9. · 3.39 Impact Factor
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    ABSTRACT: The efficiency of wavelength conversion by cascaded second harmonic generation / difference frequency generation (cSHG/DFG) in Ti:PPLN waveguides can be considerably improved by using a double-pass configuration. However, due to the wavelength dependent phase change by the dielectric folding mirror phase compensation is required to maintain an optimum power transfer. We experimentally investigated three different approaches and improved the wavelength conversion efficiency up to 9 dB in comparison with the single-pass configuration.
    Optics Express 06/2010; 18(13):14225-31. · 3.55 Impact Factor
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    ABSTRACT: Based on our novel wafer-scale “Lithium-Niobate-On-Insulator” (LNOI) platform, high-refractive-index-contrast LN photonic wires are fabricated and characterized. Even periodically poled wires are developed enabling a demonstration of second harmonic generation with 1.064 μm fundamental radiation.
    IEEE Photonics Society, 2010 23rd Annual Meeting of the; 01/2010
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    ECIO; 01/2010
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    ABSTRACT: Recent progress of wavelength conversion and all-optical signal processing in periodically poled lithium niobate (PPLN) waveguides is reported. Applications for optical communications in the near-infrared, as well as for tuneable absorption spectroscopy in the mid-infrared are highlighted. Novel waveguide structures and fabrication methods are presented.
    Fraunhofer HHI. 11/2009;
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    ABSTRACT: The self-pulsing laser reported here was fabricated in a 92 mm long Er-diffusion doped Z-cut LN substrate with a surface concentration of about 1.24 x 10<sup>20</sup> cm<sup>-3</sup> and a diffusion depth of 8.4 mum. Ti stripes of 7 mum width were indiffused to define single mode waveguides for the 1550 nm wavelength range. The laser cavity was formed by two dielectric multilayer mirrors, one of them vacuum-deposited on the input/output face of the Ti:Er:LN waveguide.
    Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on; 07/2009
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    ABSTRACT: In this paper, wavelength conversion at 1.55 mum telecom window by double-pass cSHG/DFG in zinc is reported. Ti-indiffused, periodically poled lithium niobate (PPLN) channel waveguides. Dispersion in LN itself is used to compensate wavelength dependent phase shifts of fundamental-, SHG (pump)-, signal-, and idler waves upon reflection.
    Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on; 07/2009

Publication Stats

876 Citations
132.51 Total Impact Points

Institutions

  • 1991–2013
    • Universität Paderborn
      • • Faculty of Science
      • • Department of Physics
      Paderborn, North Rhine-Westphalia, Germany
  • 2010–2011
    • Fraunhofer Heinrich-Hertz-Institute HHI
      • Department of Photonic Networks and Systems
      Berlín, Berlin, Germany
  • 2007
    • University of Geneva
      • Department of Applied Physics
      Genève, GE, Switzerland
  • 2005–2006
    • Technische Universiteit Eindhoven
      • Department of Electrical Engineering
      Eindhoven, North Brabant, Netherlands
  • 1987–1998
    • Politecnico di Torino
      Torino, Piedmont, Italy
  • 1978–1980
    • Technische Universität Dortmund
      Dortmund, North Rhine-Westphalia, Germany