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ABSTRACT: Polarization-insensitive wavelength conversion of a single channel 320 Gb/s RZ-DQPSK data signal using a Ti:PPLN waveguide
in a bi-directional loop configuration with less than 0.5dB polarization sensitivity is reported. The conversion efficiency
with polarization scrambling of the signal was −21 dB, which includes 9.2dB of passive losses in the whole Ti:PPLN subsystem.
In BER measurements error-free operation with 2dB OSNR penalty for the converted signal was achieved. Theoretical and experimental
investigations of the temporal shape and chirp of the converted data pulses show only very little broadening and chirping,
indicating the potential for wavelength conversion of even much higher data rates.
Applied Physics B 04/2012; 101(4):875-882. · 2.19 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; · 2.19 Impact Factor
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ECIO; 01/2010
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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
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ABSTRACT: The state of the art of quasi phase matched integrated optical parametric generators and oscillators is reviewed. The core
of these devices is a periodically poled Ti:LiNbO3 waveguide of propagation losses down to 0.03 dB/cm and a length up to 180
mm. These properties enable the development of efficient, tuneable, compact light sources for the mid infrared (2700 nm <
λs,i < 3500 nm)spectral range.
Keywords: Nonlinear optics; parametric frequency conversion; lithium niobate; quasi-phase matching; optical parametric fluorescence;
optical parametric oscillation.
12/2007: pages 377-392;
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B Hüttl,
R Elschner, H Suche,
A Gual i Coca,
Ch-A Bunge,
C Schmidt-Langhorst,
R Ludwig,
R Nouroozi,
HG Weber,
K Petermann,
W Sohler,
C Schubert
Asia Pacific Optical Communications; 11/2007
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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 microm. 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-repeater architectures with photon-echo based multimode quantum memories.
Physical Review Letters 11/2007; 99(17):173602. · 7.37 Impact Factor
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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.
09/2007;
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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.
07/2007;
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ABSTRACT: We demonstrate wavelength conversion of 160 Gbit/s DPSK and 320 Gbit/s DQPSK data signals by cascaded second-harmonic and difference frequency generation in a periodically poled LiNbO<sub>3</sub> waveguide. Error free operation with negligible penalty is obtained.
Lasers and Electro-Optics, 2007. CLEO 2007. Conference on; 06/2007
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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 single-mode Ti:Er:LiNbO(3) waveguide, we found that decoherence in the medium translates only as loss and not as degradation of information. We measured a visibility for interfering echoes close to 100%. These results may have important implications for future long-distance quantum communication protocols.
Physical Review Letters 04/2007; 98(11):113601. · 7.37 Impact Factor
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ABSTRACT: We show that OPC enables long-haul transmission with terrestrial fiber spans (94.5 km) and EDFA only amplification. In this experiment, 42.8-Gbit/s RZ-DQPSK with 0.8-bit/s/Hz spectral efficiency is transmitted over 42 SSMF spans, corresponding to a length of 3,970-km.
Optical Communications, 2006. ECOC 2006. European Conference on; 10/2006
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W. Sohler,
W. Grundkotter,
H. Herrmann,
J.H. Lee,
Y.H. Min,
V. Quiring, H. Suche,
R. Schiek,
T. Pertsch,
F. Lederer,
R. Iwanow,
G.I. Stegeman,
S.L. Jansen
[show abstract]
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ABSTRACT: Recent progress achieved with integrated optical devices exploiting quasi-phasematched second order nonlinear interactions in periodically poled Ti:LiNbO<sub>3</sub> waveguide structures is reported. Wavelength conversion, parametric amplification, multiplexing, and switching are demonstrated as examples of ultra-fast all-optical signal processing in the 1.5-mum wavelength range for transparent optical networks
Transparent Optical Networks, 2006 International Conference on; 07/2006
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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.
Journal of Lightwave Technology 02/2006; 24(1):54- 64. · 2.78 Impact Factor
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ABSTRACT: The state of the art of integrated optical parametric oscillators with Ti-indiffused waveguides in periodically poled lithium niobate (PPLN) is reviewed with emphasis on devices for the mid infrared spectral range (2700 nm<λ<sub>s.i</sub><3500 nm).
Lasers and Electro-Optics, 2005. (CLEO). Conference on; 06/2005
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S.L. Jansen,
D. van den Borne,
C. Climent,
M. Serbay,
C.-J. Weiske, H. Suche,
P.M. Krummrich,
S. Spalter,
S. Calabro,
N. Hecker-Denschlag,
P. Leisching,
W. Rosenkranz,
W. Sohler,
G.D. Khoe,
T. Koonen,
H. de Waardt
[show abstract]
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ABSTRACT: Using optical phase conjugation with a polarization independent periodically-poled lithium-niobate subsystem, we demonstrate dense WDM 2×10 Gbit/s RZ-DQPSK transmission over 10,200 km of SSMF with a record accumulated dispersion exceeding 80,000 ps/nm.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
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ABSTRACT: A dual-window spectral analysis polarization-mode dispersion (PMD) penalty monitor of novel design for 40-Gb/s return-to-zero signals is presented. Its good performance was verified in a PMD compensation experiment using an electrooptical Ti : LiNbO<sub>3</sub> distributed compensator.
IEEE Photonics Technology Letters 05/2004; · 2.19 Impact Factor
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D. Caccioli,
A. Paoletti,
A. Schiffini,
A. Galtarossa,
P. Griggio,
G. Lorenzetto,
P. Minzioni,
S. Cascelli,
M. Guglielmucci,
L. Lattanzi,
F. Matera,
G.M.T. Beleffi,
V. Quiring,
W. Sohler, H. Suche,
S. Vehovc,
M. Vidmar
[show abstract]
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ABSTRACT: The development of wavelength-division multiplexing (WDM) all-optical transport networks is an interesting solution to increase the capacity of long-haul transmission systems and to solve the route-exhaust problems of metropolitan networks, driving down the cost of that traffic. Routing can be achieved using a transparent device able to select and interchange wavelengths, such as an all-optical wavelength converter. In this paper, an optical transport network over an embedded link located between Rome and Pomezia in Italy is emulated. The transmission has been realized along a WDM, 5×100 km long, dispersion managed link at 40 Gb/s. The in-line rerouting process has been controlled by means of an all-optical wavelength converter realized with a periodically poled lithium niobate waveguide. Moreover, a polarization-independent scheme for the converter has been exploited to allow the in-line signal processing. This scheme is based on the counterpropagation of TE and TM signal components along the same guide and results extremely compact. In this paper it is demonstrated that wavelength conversion and rerouting add no penalty with respect to the simple transmission along the embedded cable. This result seems to be another step toward the feasibility of true all-optical networks.
IEEE Journal of Selected Topics in Quantum Electronics 04/2004; · 3.78 Impact Factor
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ABSTRACT: Quasi phase matched second order nonlinear optical interactions in periodically poled LiNbO<sub>3</sub> waveguides are exploited to develop efficient integrated optical devices for all-optical wavelength conversion, parametric amplification, time division (de-)multiplexing, phase- and polarisation-switching.
Lasers and Electro-Optics, 2003. CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on; 01/2004
