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Your search keyword '"Suche, H."' showing total 195 results
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195 results on '"Suche, H."'

1. Interference of Spontaneous Emission of Light from two Solid-State Atomic Ensembles

Author

Afzelius, M., Staudt, M. U., Riedmatten, H. de., Simon, C., Hastings-Simon, S. R., Ricken, R., Suche, H., Sohler, W., and Gisin, N.

Subjects
Quantum Physics
Abstract

We report an interference experiment of spontaneous emission of light from two distant solid-state ensembles of atoms that are coherently excited by a short laser pulse. The ensembles are Erbium ions doped into two LiNbO3 crystals with channel waveguides, which are placed in the two arms of a Mach-Zehnder interferometer. The light that is spontaneously emitted after the excitation pulse shows first-order interference. By a strong collective enhancement of the emission, the atoms behave as ideal two-level quantum systems and no which-path information is left in the atomic ensembles after emission of a photon. This results in a high fringe visibility of 95%, which implies that the observed spontaneous emission is highly coherent.

Published
2007
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2. Interference of multi-mode photon echoes generated in spatially separated solid-state atomic ensembles

Author

Staudt, M. U., Afzelius, M., de Riedmatten, H., Hastings-Simon, S. R., Simon, C., Ricken, R., Suche, H., Sohler, W., and Gisin, N.

Subjects
Quantum Physics
Abstract

High-visibility interference of photon echoes generated in spatially separated solid-state atomic ensembles is demonstrated. The solid state ensembles were LiNbO$_3$ waveguides doped with Erbium ions absorbing at 1.53 $\mu$m. Bright coherent states of light in several temporal modes (up to 3) are stored and retrieved from the optical memories using two-pulse photon echoes. The stored and retrieved optical pulses, when combined at a beam splitter, show almost perfect interference, which demonstrates both phase preserving storage and indistinguishability of photon echoes from separate optical memories. By measuring interference fringes for different storage times, we also show explicitly that the visibility is not limited by atomic decoherence. These results are relevant for novel quantum repeaters architectures with photon echo based multimode quantum memories.

Published
2007
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3. Fidelity of an optical memory based on stimulated photon echoes

Author

Staudt, M. U., Hastings-Simon, S. R., Nilsson, M., Afzelius, M., Scarani, V., Ricken, R., Suche, H., Sohler, W., Tittel, W., and Gisin, N.

Subjects
Quantum Physics
Abstract

We investigated the preservation of information encoded into the relative phase and amplitudes of optical pulses during storage and retrieval in an optical memory based on stimulated photon echo. By interfering photon echoes produced in a Ti-indiffused single-mode Er-doped LiNbO$_{3}$ waveguiding structure at telecom wavelength, we found that decoherence in the atomic medium translates only as losses (and not as degradation) of information, as long as the data pulse series is short compared to the atomic decoherence time. The experimentally measured value of the visibility for interfering echoes is close to 100 %. In addition to the expected three-pulse photon-echo interferences we also observed interference due to a four-pulse photon echo. Our findings are of particular interest for future long-distance quantum communication protocols, which rely on the reversible transfer of quantum states between light and atoms with high fidelity.

Published
2006
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12. Integrated optical Ti:Er:LiNbOsub3 soliton source

Author

Suche, H., Greiner, A., Qui, W., Wessel, R., and Sohler, Wolfgang

Subjects
Quantum electronics -- Research, Waveguides -- Usage, Lasers -- Design and construction, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Mode-locking is a useful way of generating pulse trains with high repetition rates and peak power, amd mode-locking lasers, emitting in the third telecommunication window are seen as particularly promising. Er-doped LiNbOsub3 is useful in the relaization of a mode-locked source, having good electrooptic properties. The fabrication of an efficient, diode-pumped, fully packagaged harmonically mode-locked laser is described

Published
1997

17. Phase conjugation for increased system robustness

Author

Jansen, S.L., Borne, van den, D., Krummrich, P.M., Spälter, S., Suche, H., Sohler, W., Khoe, G.D., Waardt, de, H., and Electro-Optical Communication

Abstract

The transmission performance of optical phase conjugation (OPC) is assessed with a special focus on the combination with the RZ-DQPSK modulation format. We show that when OPC is employed, significant performance improvement is obtained compared to conventional DCF based transmission.

Published
2006

18. Advanced Ti:LiNbO3 Waveguide Lasers

Author

Becker, C., Oesselke, T., Pandavenes, J., Ricken, R., Rochhausen, K., Schreiber, G., Sohler, W., Suche, H., Wessel, R., Balsamo, S., Montrosset, Ivo, and Sciancalepore, D.

Published
2000

21. All-optical signal processing devices with (periodically poled) lithium niobate waveguides

Author

Sohler, W., Grundkötter, W., Herrmann, H., Hu, H., Jansen, S.L., Lee, J.H., Min, Y.H., Quiring, V., Ricken, R., Reza, S., Suche, H., Wehrspohn, R.B., Sohler, W., Grundkötter, W., Herrmann, H., Hu, H., Jansen, S.L., Lee, J.H., Min, Y.H., Quiring, V., Ricken, R., Reza, S., Suche, H., and Wehrspohn, R.B.

Abstract

Integrated optical Lithium Niobate devices for all-optical signal processing in the 1.5 mum wavelength range are reviewed. Besides nonlinear devices with periodically poled waveguides tunable Ti:Er:LiNbO3 waveguide lasers are presented. Novel waveguide structures are reported.

Published
2007

22. Materiales para láseres en guía de onda: L¡Nb03:Er/Nd

Author

Herreros, B., Muñoz, J.A., Cantelar Alcaide, Eugenio Francisco, Pernas, P.L., Lifante, G., Cussó Pérez, Fernando, Townsend, P.D., Chandler, P.J., Schäfer, K., Suche, H., Sohler, W., and UAM. Departamento de Física de Materiales

Subjects
Niobato de litio, Neodimio, Guías de onda, Fotoluminiscencia, Física, Erbio
Published
1997

23. Optical phase conjugation for ultra long-haul phase shift keyed transmission

Author

Jansen, S.L., Borne, van den, D., Spinnler, B., Calabro, S., Suche, H., Krummrich, P.M., Sohler, W., Khoe, G.D., Waardt, de, H., Jansen, S.L., Borne, van den, D., Spinnler, B., Calabro, S., Suche, H., Krummrich, P.M., Sohler, W., Khoe, G.D., and Waardt, de, H.

Abstract

Nonlinear phase noise (Gordon-Mollenauer phase noise) can limit the transmission distance for phase-shift-keyed modulation formats. In this paper, the compensation of nonlinear phase noise by a midlink optical phase conjugation (OPC) is studied. A proof-of-principle experiment is presented showing an over 4-dB improvement in Q factor when OPC is employed in a differential phase-shift-keying (DPSK) system. Also, an ultra long-haul OPC-based differential quadrature phase-shift-keying (DQPSK) transmission experiment is studied to show the impact of self-phase modulation (SPM)-induced impairments, including nonlinear phase noise, in a transmission line. OPC results in a 44% increase in transmission distance when compared to a "conventional" transmission system using dispersion compensating fiber (DCF) for chromatic dispersion compensation.

Published
2006

26. Lithium niobate photonic wires

Author

Hu, H., primary, Buchter, D., additional, Gui, L., additional, Suche, H., additional, Quiring, V., additional, Ricken, R., additional, Herrmann, H., additional, and Sohler, W., additional

Published
2010
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39. Towards Long-Distance Quantum Communication

Author

Tittel, W., primary, Afzelius, M., additional, Gisin, N., additional, Ricken, R., additional, Hastings-Simon, S., additional, Scarani, V., additional, Suche, H., additional, Sohler, W., additional, and Staudt, M., additional

Published
2007
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43. In-Fieldn× 40 Gb/s Transmission Experiments with In-Line All-Optical Wavelength Conversion

Author

Schiffini, A., primary, Paoletti, A., additional, Caccioli, D., additional, Minzioni, P., additional, Suche, H., additional, Lee, Y. L., additional, Galtarossa, A., additional, Griggio, P., additional, Lorenzetto, G., additional, Matera, F., additional, Tosi-Beleffi, G. M., additional, Curti, F., additional, Guglielmucci, M., additional, Cascelli, S., additional, Lattanzi, L., additional, Vidmar, Matjaz, additional, and Monteiro, P. P., additional

Published
2005
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45. 10,200 km 22/spl times/2/spl times/10 Gbit/s RZ-DQPSK dense WDM transmission without inline dispersion compensation through optical phase conjugation

Author

Jansen, S.L., primary, van den Borne, D., additional, Climent, C., additional, Serbay, M., additional, Weiske, C.-J., additional, Suche, H., additional, Krummrich, P.M., additional, Spalter, S., additional, Calabro, S., additional, Hecker-Denschlag, N., additional, Leisching, P., additional, Rosenkranz, W., additional, Sohler, W., additional, Khoe, G.D., additional, Koonen, T., additional, and de Waardt, H., additional

Published
2005
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47. Field Demonstration of In-Line All-Optical Wavelength Conversion in a WDM Dispersion Managed 40-Gbit/s Link

Author

Caccioli, D., primary, Paoletti, A., additional, Schiffini, A., additional, Galtarossa, A., additional, Griggio, P., additional, Lorenzetto, G., additional, Minzioni, P., additional, Cascelli, S., additional, Guglielmucci, M., additional, Lattanzi, L., additional, Matera, F., additional, TosiBeleffi, G.M., additional, Quiring, V., additional, Sohler, W., additional, Suche, H., additional, Vehovc, S., additional, and Vidmar, M., additional

Published
2004
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