Filters








60 Hits in 12.8 sec

Increase in data capacity utilising dimensions of wavelength, space, time, polarisation and multilevel modulation using a single laser

A. T. Clausen, H. Hu, F. Ye, A. K. Medhin, Y. Ding, R. Asif, M. Galili, T. Morioka, L. K. Oxenlowe
2015 2015 17th International Conference on Transparent Optical Networks (ICTON)  
By exploiting several dimensions, i.e. wavelength, space, time, polarisation and multilevel modulation simultaneously, a single laser can offer formidable capacity performance with potentially reduced  ...  Increasing the capacity of optical networks while have the objective of lowering the total consumed energy per bit is challenging.  ...  CAPACITY INCREASING TECHNIQUES Several physical dimensions can be utilised to increase the capacity of optical communication systems, i.e. frequency/wavelength, time, polarisation, quadrature and space  ... 
doi:10.1109/icton.2015.7193678 fatcat:z77scr2c45dllekvzkfa3tp23q

Science and technology challenges in XXIst century optical communications

E. Desurvire, C. Kazmierski, F. Lelarge, X. Marcadet, André Scavennec, F.A. Kish, D.F. Welch, R. Nagarajan, C.H. Joyner, R.P. Schneider, S.W. Corzine, M. Kato (+13 others)
2011 Comptes rendus. Physique  
This advance represented an order of magnitude increase in data capacity per chip compared to existing commercial devices and utilised a multi-wavelength array of ten tunable DFB lasers (aligned to an  ...  This is why optical multilevel modulation formats coded in amplitude, phase and polarisation, with both coherent and directdetection, are presently receiving great attention as a large increase in data  ... 
doi:10.1016/j.crhy.2011.04.009 fatcat:dglyba3befd6jfvd4orn6vq2y4

A review of gallium nitride LEDs for multi-gigabit-per-second visible light data communications

Sujan Rajbhandari, Jonathan J D McKendry, Johannes Herrnsdorf, Hyunchae Chun, Grahame Faulkner, Harald Haas, Ian M Watson, Dominic O'Brien, Martin D Dawson
2017 Semiconductor Science and Technology  
It is also very unlikely that a single communication technology can support these growing data requirements in all places at all times.  ...  Furthermore, advances in key technologies, including advanced modulation, equalisation, and multiplexing that have enabled free-space VLC data rates beyond 10 Gb/s are also outlined.  ...  We also gratefully acknowledge the contributions to this work of all the partners in UP-VLC.  ... 
doi:10.1088/1361-6641/32/2/023001 fatcat:iyl2iqfnzjbrfjblw4e3q3oeq4

All-Optical Regeneration of Phase Encoded Signals [chapter]

Joseph Kakande, Radan Slavík, Francesca Parmigiani, Periklis Petropoulos, David Richardson
2013 Optical Fiber Telecommunications  
By adopting wavelength division multiplexing (WDM) of high baud-rate (on-off keyed, OOK) channels, data signalling rates approaching 1Tbit/s down a single fibre were commonly deployed commercially for  ...  More recently, a resurgence in the use of coherent detection has allowed for an increase in spectral efficiency by the adoption of higher order modulation formats, such as coherent quadrature phase shift  ...  Provided that the conjugation mechanism used is much faster than the data modulation (this criterion is met by utilising the ultrafast Kerr effect),  in Eqn 1.14 can be replaced by a time-varying phase  ... 
doi:10.1016/b978-0-12-396958-3.00016-0 fatcat:juasmvhuwnhthoyywlfpgq2doq

Laser cooling and trapping of neutral atoms

C.S. Adams, E. Riis
1997 Progress in Quantum Electronics  
This review explains the basic mechanisms used in laser cooling and trapping, and illustrates the development of the field by describing a selection of key experiments.  ...  The ability to cool, manipulate, and trap atoms using laser light has allowed a new, rapidly expanding field to emerge.  ...  Acknowledgements- Part of the work presented in this paper was supported by the United Kingdom Engineering and Physical Sciences Research Council (EPSRC).  ... 
doi:10.1016/s0079-6727(96)00006-7 fatcat:nxbhbdzhljaybjwbvgrdljtfvu

Front Matter: Volume 7314

Proceedings of SPIE, Alex A. Kazemi, Bernard C. Kress
2009 Photonics in the Transportation Industry: Auto to Aerospace II  
Raulot, SESSION 5 PHOTONICS IN DATA TRANSMISSION FOR TRANSPORTATION 7314 0K Space-based laser cross-link systems used in satellite communications [7314-19] A. Panahi, A. A.  ...  for space and defence applications [7314-23] M.  ...  ., for his valuable support and advice, and for providing us with the F-15 sample for evaluation.  ... 
doi:10.1117/12.833099 fatcat:sg4v4pv3uve2bfyovrzzxtqgbe

Multispot fiber laser welding [article]

Klaus Schutt Hansen
2015 Ph.d.-serien for Det Teknisk-Naturvidenskabelige Fakultet, Aalborg Universitet  
In the report the two terms single mode fiber laser and high brightness are used several times.  ...  Rework of data from paper C: Joining of multiple sheets in a butt-joint configuration using single pass laser welding with multiple spots" [101] .  ...  a butt-joint configuration using single pass laser welding with multiple spots Abstract The introduction of high power single mode fiber lasers has given deeper and narrower laser welds than seen previously  ... 
doi:10.5278/vbn.phd.engsci.00043 fatcat:3bfak5nye5eupci2agigkrjstm

Photonic integrated circuits for NG-EPON

Carla Rodrigues, Francisco Rodrigues, Mário Lima, António Teixiera, Manuel Filipe P. Martins Costa
2017 Third International Conference on Applications of Optics and Photonics  
There has been a constant study under this topic for the purpose of using all the fiber abilities and to find new solutions to keep the access network simple.  ...  for higher bandwidth presents one of the most important modern challenges in telecommunications infrastructures.  ...  direct modulation characteristic, hold tunable capacities and present a great single-mode behaviour with a small spectral width (in order of a few MHz ) [8] .  ... 
doi:10.1117/12.2271837 fatcat:4sxjk3qgxrbrvggxsznwq5igvy

Materials and Structures for Nonlinear Photonics [chapter]

Xin Gai, Duk-Yong Choi, Steve Madden, Barry Luther-Davies
2015 Springer Series in Optical Sciences  
(Figure 6 ) They used a single pump laser tuned to the resonance of the ring, then ~1000 times higher light power circulating in the ring which leads to cascaded 4WM, and allowing narrow multi-wavelength  ...  [121] demonstrated significant improvements in the signal quality of coherently coded data this way, and in the case of Wu et al. did this with 8 channels of polarisation and wavelength division multiplexed  ... 
doi:10.1007/978-3-319-14992-9_1 fatcat:r6bc7ixavnhudkdkuvo23xakrq

Recent Advances and Applications of Hyperspectral Imaging for Fruit and Vegetable Quality Assessment

D. Lorente, N. Aleixos, J. Gómez-Sanchis, S. Cubero, O. L. García-Navarrete, J. Blasco
2011 Food and Bioprocess Technology  
In addition, computation of the classifiers used to deal with the data obtained from the images can become excessively complex and time consuming for such high dimensional data sets and this makes it difficult  ...  A typical hyperspectral image is composed of a set of a relatively wide range of monochromatic images corresponding to continuous wavelengths that normally contain redundant information or may exhibit  ...  de Ciencia e Innovación de España (MICINN) through research project DPI2010-19457, both projects with the support of European FEDER funds.  ... 
doi:10.1007/s11947-011-0725-1 fatcat:4li4eo7ucreodepraa3fj2xmum

Roadmap on integrated quantum photonics

Galan Moody, Volker Sorger, Paul Juodawlkis, William Loh, Cheryl Sorace-Agaskar, Alex E. Jones, Krishna Balram, Jonathan Matthews, Anthony Laing, Marcelo Davanco, Lin Chang, John Bowers (+42 others)
2021 Journal of Physics: Photonics  
Integrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of qubits.  ...  In the last decade, remarkable advances in quantum photonic integration have enabled table-top experiments to be scaled down to prototype chips with improvements in efficiency, robustness, and key performance  ...  Data availability statement No new data were created or analysed in this study.  ... 
doi:10.1088/2515-7647/ac1ef4 fatcat:2jqgl67nczdjhfbfriapotmbbu

5G technology: towards dynamic spectrum sharing using cognitive radio networks

W. S. H. M. W. Ahmad, N. A. M. Radzi, F. S. Samidi, A. Ismail, F. Abdullah, M. Z. Jamaludin, M. N. Zakaria
2020 IEEE Access  
This increase has revolutionised the current network into 5G technology, which demands increased capacity, high data rate and ultra-low latency.  ...  For a complete survey, discussions are conducted on the issues and challenges in the current implementation of SS and CR, and the means to support efficient 5G advancement are provided.  ...  For the application of 5G access fronthaul, the mmWave signal frequency used was 60 GHz which was generated using a dual-wavelength fibre laser [63] .  ... 
doi:10.1109/access.2020.2966271 fatcat:cobdo5ucibcdpc5jfecbdwhni4

Nanotechnology Applications in Cancer

Shuming Nie, Yun Xing, Gloria J. Kim, Jonathan W. Simons
2007 Annual Review of Biomedical Engineering  
Bernard Jacquier, who has played a major role in the advancement, and direction of this thesis.  ...  For this, and much more, I am very grateful. Half of this work has been done within a collaboration between members of the European Research Group NANOLUM.  ...  They have advantages such as providing us with a single layered nanoparticle sample, a control of their spacing, and a short time consuming preparation.  ... 
doi:10.1146/annurev.bioeng.9.060906.152025 pmid:17439359 fatcat:5my6kbgiqvddlexor5qwj2shmu

Influences of turbulences in near vicinity of buildings on free-space optical links

J. Libich, S. Zvanovec
2011 IET Microwaves, Antennas & Propagation  
The influences of a nearby building on free-space optical links are discussed on the basis of measured data.  ...  in the bending or widening of transmitted optical beams.  ...  ACKNOWLEDGMENTS The research is a part of the activities of the Department of Electromagnetic Field of the Czech Technical University in Prague within the framework of the research Project of the Ministry  ... 
doi:10.1049/iet-map.2010.0630 fatcat:nzkuv3yv3bczvc3knhi222sime

Performance report and optimized implementation of Weather Climate Dwarfs on GPU, MIC and Optalysys Optical Processor [article]

Cyril Mazauric, Erwan Raffin, Xavier Vigouroux, David Guibert, Alex Macfaden, Jacob Poulsen, Per Berg, Alan Gray, Peter Messmer
2019 arXiv   pre-print
transform, 9x for MPDATA) using data locality optimizations and (c) demonstrated feasibility of a spectral transform in a purely optical fashion.  ...  We limit ourselves to a subset of the dwarf configurations and to problem sizes small enough to execute on a single node. Also, we use time-to-solution as the main performance metric.  ...  These operate in a single spherical dimension, and can be batched over fields in a relatively straightforward manner using the batching interface to the library.  ... 
arXiv:1908.06096v1 fatcat:ygj3emmievgktlkprliacke7ce
« Previous Showing results 1 — 15 out of 60 results