9,563 research outputs found
Low-energy, high-performance lossless 8×8 SOA switch
We demonstrate the first monolithically-integrated active-passive lossless 8×8 SOA
switch. A wide IPDR of 14.5dB for penalty <1dB is achieved. The switch paths through the device
exhibit excellent uniformity.The research leading to these results has received funding from the UK EPSRC through the
INTERNET, STAR and COPOS II grants and the European Commission under FP7 grant agreement ICT 257210
PARADIGM.This is the accepted manuscript. The final version is available from OSA at http://www.opticsinfobase.org/abstract.cfm?uri=OFC-2015-Th4E.6
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Demonstration of the feasibility of large-port-count optical switching using a hybrid Mach-Zehnder interferometer-semiconductor optical amplifier switch module in a recirculating loop.
For what we believe is the first time, the feasibility of large-port-count nanosecond-reconfiguration-time optical switches is demonstrated using a hybrid approach, where Mach-Zehnder interferometric (MZI) switches provide low-loss, high-speed routing with short semiconductor optical amplifiers (SOAs) being integrated to enhance extinction. By repeatedly passing signals through a monolithic hybrid dilated 2×2 switch module in a recirculating loop, the potential performance of high-port-count switches using the hybrid approach is demonstrated. Experimentally, a single pass switch penalty of only 0.1 dB is demonstrated for the 2×2 module, while even after seven passes through the switch, equivalent to a 128×128 router, a penalty of only 2.4 dB is recorded at a data rate of 10 Gb/s.This is the author accepted manuscript. The final version is published in Optics Letters - http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-18-5244
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High Performance 400 Gigabit Ethernet Links using Hybrid Multiband CAP/QAM Scheme
We propose the first combined 4×100Gb/s hybrid multiband CAP-16 transmitter and
QAM-16 receiver system and simulations show that it has 0.7 dBo (2.2 dBo) more power margin
than 8×50Gb/s (4×100Gb/s) PAM-4 over DML (EML) SMF link.This work was partly supported by the European Union under a Marie Curie Intra-European Fellowship for Career
Development (CEEOALAN project) and by the UK EPSRC via the INTERNET project.This is the accepted manuscript. The final version is available at https://www.osapublishing.org/abstract.cfm?uri=OFC-2015-Th2A.65
56 Gb/s PAM-4 data transmission over a 1 m long multimode polymer interconnect
Advanced modulation formats can enable >40 Gb/s data rates in waveguide-based optical interconnects without the need for high-specification optoelectronic components. Record 56 Gb/s PAM-4 data transmission is demonstrated over a 1 m-long multimode polymer waveguide.The authors acknowledge Dow Corning for providing the polymer samples, IQE for supplying the VCSEL epitaxial material, the Swedish Foundation for Strategic Research for financial support and Tektronix for the loan of the DSA.This is the author accepted manuscript. The final version is available from OSA Publishing via http://dx.doi.org/10.1364/CLEO_SI.2015.STu4F.
Probing Shadowed Nuclear Sea with Massive Gauge Bosons in the Future Heavy-Ion Collisions
The production of the massive bosons and could provide an
excellent tool to study cold nuclear matter effects and the modifications of
nuclear parton distribution functions (nPDFs) relative to parton distribution
functions (PDFs) of a free proton in high energy nuclear reactions at the LHC
as well as in heavy-ion collisions (HIC) with much higher center-of mass
energies available in the future colliders. In this paper we calculate the
rapidity and transverse momentum distributions of the vector boson and their
nuclear modification factors in p+Pb collisions at TeV and in
Pb+Pb collisions at TeV in the framework of perturbative QCD
by utilizing three parametrization sets of nPDFs: EPS09, DSSZ and nCTEQ. It is
found that in heavy-ion collisions at such high colliding energies, both the
rapidity distribution and the transverse momentum spectrum of vector bosons are
considerably suppressed in wide kinematic regions with respect to p+p reactions
due to large nuclear shadowing effect. We demonstrate that in the massive
vector boson productions processes with sea quarks in the initial-state may
give more contributions than those with valence quarks in the initial-state,
therefore in future heavy-ion collisions the isospin effect is less pronounced
and the charge asymmetry of W boson will be reduced significantly as compared
to that at the LHC. Large difference between results with nCTEQ and results
with EPS09 and DSSZ is observed in nuclear modifications of both rapidity and
distributions of and in the future HIC.Comment: 13 pages, 21 figures, version accepted for publication in Eur. Phys.
J.
Design and Testing of Cesium Atomic Concentration Detection System Based on TDLAS
In order to better build the Neutral Beam Injector with Negative Ion Source
(NNBI), the pre-research on key technologies has been carried out for the
Comprehensive Research Facility for Fusion Technology (CRAFT). Cesium seeding
into negative-ion sources is a prerequisite to obtain the required negative
hydrogen ion. The performance of ion source largely depends on the cesium
conditions in the source. It is very necessary to quantitatively measure the
amount of cesium in the source during the plasma on and off periods (vacuum
stage). This article uses the absorption peak of cesium atoms near 852.1nm to
build a cesium atom concentration detection system based on Tunable Diode Laser
Absorption Spectroscopy (TDLAS) technology. The test experiment based on the
cesium cell is carried out, obtained the variation curve of cesium
concentration at different temperatures. The experimental results indicate
that: the system detection range is within 5*10E6-2.5*10E7 pieces/cm3 and the
system resolution better than 1*10E6 pieces/cm3.Comment: 8 pages,7 figures, the 20th International Symposium on Laser-Aided
Plasma Diagnostic
6.25 Gb/s POF link using GaN μLED arrays and optically generated pulse amplitude modulation
Optically-generated PAM schemes using μLED arrays are implemented for high-speed POF links for the first time. 6.25Gb/s PAM-16 transmission is demonstrated using 4 μLEDs, exhibiting 3.8dB greater power-margin than a link with a single μLED.This work is supported by the UK Engineering and Physical Sciences Research Council (EPSRC) via the Ultra Parallel Visible Light Communication (UP-VLC) Project.This is the accepted manuscript of a paper published in CLEO: 2015 (X. Li, N. Bamiedakis, J. Wei, J. Mckendry, E. Xie, R. Ferreira, E. Gu, M. Dawson, R. V. Penty, and I. H. White, "6.25 Gb/s POF Link Using GaN μLED Arrays and Optically Generated Pulse Amplitude Modulation," in CLEO: 2015, OSA Technical Digest (online) (Optical Society of America, 2015), paper STu4F.7.). The final version is available at http://dx.doi.org/10.1364/CLEO_SI.2015.STu4F.7 © 2015 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited
Rationally Designed Sodium Chromium Vanadium Phosphate Cathodes with Multi-Electron Reaction for Fast-Charging Sodium-Ion Batteries
Sodium super-ionic conductor (NASICON)-structured phosphates are emerging as rising stars as cathodes for sodium-ion batteries. However, they usually suffer from a relatively low capacity due to the limited activated redox couples and low intrinsic electronic conductivity. Herein, a reduced graphene oxide supported NASICON Na3Cr0.5V1.5(PO4)3 cathode (VC/C-G) is designed, which displays ultrafast (up to 50 C) and ultrastable (1 000 cycles at 20 C) Na+ storage properties. The VC/C-G can reach a high energy density of ≈470 W h kg−1 at 0.2 C with a specific capacity of 176 mAh g−1 (equivalent to the theoretical value); this corresponds to a three-electron transfer reaction based on fully activated V5+/V4+, V4+/V3+, V3+/V2+ couples. In situ X-ray diffraction (XRD) results disclose a combination of solid-solution reaction and biphasic reaction mechanisms upon cycling. Density functional theory calculations reveal a narrow forbidden-band gap of 1.41 eV and a low Na+ diffusion energy barrier of 0.194 eV. Furthermore, VC/C-G shows excellent fast-charging performance by only taking ≈11 min to reach 80% state of charge. The work provides a widely applicable strategy for realizing multi-electron cathode design for high-performance SIBs
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High speed plastic optical fiber data links using LEDs
Manuscript originally submitted to the repository as for publication by IEEE in the papers of the International Conference On Communication Problem-Solving (ICCP2014). However, it does not appear among the published papers for this conference, and no reference has been found to it being published elsewhere.Plastic optical fiber (POF) data links have been widely viewed as a cost- and energy- effective solutions for short-reach Gigabit data communications such as in-home and automotive networks. POF also has excellent compatibility with low-cost light-emitting-diodes (LEDs). In this paper, we demonstrate a 4 Gb/s single micro-LED (μLED) PAM-16 link and a record 4.7 Gb/s multiple μLEDs PAM-8 link by 1) use of avalanche photodiodes (APD) in combination with high order modulation formats; and 2) illumination of multiple μLEDs. Both digital implementation based on FPGA and analogue implementation are considered for real-time transmitters
On-demand semiconductor single-photon source with near-unity indistinguishability
Single photon sources based on semiconductor quantum dots offer distinct
advantages for quantum information, including a scalable solid-state platform,
ultrabrightness, and interconnectivity with matter qubits. A key prerequisite
for their use in optical quantum computing and solid-state networks is a high
level of efficiency and indistinguishability. Pulsed resonance fluorescence
(RF) has been anticipated as the optimum condition for the deterministic
generation of high-quality photons with vanishing effects of dephasing. Here,
we generate pulsed RF single photons on demand from a single,
microcavity-embedded quantum dot under s-shell excitation with 3-ps laser
pulses. The pi-pulse excited RF photons have less than 0.3% background
contributions and a vanishing two-photon emission probability.
Non-postselective Hong-Ou-Mandel interference between two successively emitted
photons is observed with a visibility of 0.97(2), comparable to trapped atoms
and ions. Two single photons are further used to implement a high-fidelity
quantum controlled-NOT gate.Comment: 11 pages, 11 figure
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