scholarly journals Photonic Materials for Optical Communications

MRS Bulletin ◽  
2003 ◽  
Vol 28 (5) ◽  
pp. 340-344 ◽  
Author(s):  
Hartmut Hillmer ◽  
Roland Germann
Keyword(s):  
Optical Communications ◽  
System Performance ◽  
State Of The Art ◽  
Optical Devices ◽  
Photonic Materials ◽  
Materials Properties

AbstractAn overview of key materials for optical communications, including semiconductors, dielectrics, glasses, and organics, is presented in this issue of MRS Bulletin. Materials quality is in all cases crucial for advanced device and system performance. Materials properties and important problems are reviewed, and their impact on the performance of state-of-the-art optical devices is assessed and demonstrated by means of selected examples.

Silicon-based nonlinear optical devices for high-speed optical communications

2008 ◽  
Author(s):  
Haisheng Rong ◽  
Simon Ayotte ◽  
Shengbo Xu ◽  
Oded Cohen ◽  
Mario Paniccia
Keyword(s):  
Optical Communications ◽  
High Speed ◽  
Nonlinear Optical ◽  
Optical Devices ◽  
Nonlinear Optical Devices ◽  
Silicon Based

scholarly journals ДОСЯГНЕННЯ ЕФЕКТИВНОГО РОЗПОДІЛЕНОГО ПЛАНУВАННЯ ЗА ДОПОМОГОЮ ЧЕРГ ПОВІДОМЛЕНЬ У ХМАРІ ДЛЯ БАГАТОЗАДАЧНИХ ОБЧИСЛЕНЬ ТА ВИСОКОПРОДУКТИВНИХ ОБЧИСЛЕНЬ

2020 ◽  
Author(s):  
Старовойтенко Олексій Володимирович
Keyword(s):  
Distributed Systems ◽  
System Performance ◽  
State Of The Art ◽  
Computation Time ◽  
Cloud Services ◽  
Distributed Scheduling ◽  
Message Processing ◽  
Computational Problem ◽  
Control Units ◽  
And Control

Due to the growth of data and the number of computational tasks, it is necessary to ensure the required level of system performance. Performance can be achieved by scaling the system horizontally / vertically, but even increasing the amount of computing resources does not solve all the problems. For example, a complex computational problem should be decomposed into smaller subtasks, the computation time of which is much shorter. However, the number of such tasks may be constantly increasing, due to which the processing on the services is delayed or even certain messages will not be processed. In many cases, message processing should be coordinated, for example, message A should be processed only after messages B and C. Given the problems of processing a large number of subtasks, we aim in this work - to design a mechanism for effective distributed scheduling through message queues. As services we will choose cloud services Amazon Webservices such as Amazon EC2, SQS and DynamoDB. Our FlexQueue solution can compete with state-of-the-art systems such as Sparrow and MATRIX. Distributed systems are quite complex and require complex algorithms and control units, so the solution of this problem requires detailed research.

2D materials towards ultrafast photonic applications

2020 ◽  
Vol 22 (39) ◽  
pp. 22140-22156
Author(s):  
Xin-Ping Zhai ◽  
Bo Ma ◽  
Qiang Wang ◽  
Hao-Li Zhang
Keyword(s):  
Optical Communications ◽  
2D Materials ◽  
Optical Limiting ◽  
Mode Locking ◽  
Optical Devices ◽  
Optical Modulation ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
All Optical ◽  
Ultrafast Photonics

Two-dimensional materials are now excelling in yet another arena of ultrafast photonics, including optical modulation through optical limiting/mode-locking, photodetectors, optical communications, integrated miniaturized all-optical devices, etc.

NOVEL MULTIWAVELENGTH MODE-LOCKED SEMICONDUCTOR LASERS: PHYSICS AND APPLICATIONS

2000 ◽  
Vol 10 (01) ◽  
pp. 309-317 ◽  
Author(s):  
P. J. DELFYETT ◽  
B. MATHASON ◽  
I. NITTA ◽  
H. SHI
Keyword(s):  
Semiconductor Lasers ◽  
System Performance ◽  
State Of The Art ◽  
Hybrid Approach ◽  
High Data Rate ◽  
Technology Platform ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
High Data ◽  
Communication Links

We develop and study the physics of a novel hybrid wavelength-division-multiplexed, optical timedivision-multiplexed (WDM-OTDM) mode-locked semiconductor laser for applications in ultra-high data rate communication links, computer interconnects, and optical sampling applications. The key philosophy behind using a hybrid approach is that state-of-the-art system performance can be achieved without the necessity of operating at the limits of a either a pure WDM or OTDM technology platform.

scholarly journals State-of-the-art review of materials properties of nuclear waste forms.

1981 ◽  
Author(s):  
J. E. Mendel ◽  
R. D. Nelson ◽  
R. P. Turcotte ◽  
W. J. Gray ◽  
M. D. Merz ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
State Of The Art ◽  
Materials Properties ◽  
Waste Forms ◽  
Nuclear Waste Forms

scholarly journals Fast Performance Modeling across Different Database Versions Using Partitioned Co-Kriging

2021 ◽  
Vol 11 (20) ◽  
pp. 9669
Author(s):  
Rong Cao ◽  
Liang Bao ◽  
Shouxin Wei ◽  
Jiarui Duan ◽  
Xi Wu ◽  
...  
Keyword(s):  
Performance Prediction ◽  
System Performance ◽  
Prediction Accuracy ◽  
Performance Modeling ◽  
State Of The Art ◽  
Database Systems ◽  
Target Domain ◽  
Reliable Performance ◽  
Measurement Effort ◽  
Control Functional

Database systems have a large number of configuration parameters that control functional and non-functional properties (e.g., performance and cost). Different configurations may lead to different performance values. To understand and predict the effect of configuration parameters on system performance, several learning-based strategies have been recently proposed. However, existing approaches usually assume a fixed database version such that learning has to be repeated once the database version changes. Repeating measurement and learning for each version is expensive and often practically infeasible. Instead, we propose the Partitioned Co-Kriging (PCK) approach that transfers knowledge from an older database version (source domain) to learn a reliable performance prediction model fast for a newer database version (target domain). Our method is based on the key observations that performance responses typically exhibit similarities across different database versions. We conducted extensive experiments under 5 different database systems with different versions to demonstrate the superiority of PCK. Experimental results show that PCK outperforms six state-of-the-art baseline algorithms in terms of prediction accuracy and measurement effort.

scholarly journals Meta-Material Enhanced Spatial Mode Decomposition

2021 ◽  
Author(s):  
Aaron Jones ◽  
Mengyao Wang ◽  
Xuecai Zhang ◽  
Samuel Cooper ◽  
Shumei Chen ◽  
...  
Keyword(s):  
Optical Communications ◽  
State Of The Art ◽  
Cross Coupling ◽  
Precise Information ◽  
Weight Fluctuation ◽  
Fourier Frequency ◽  
Mode Content ◽  
Mode Decomposition ◽  
Limited Precision ◽  
Active Wave

Abstract Acquiring precise information about the mode content of a laser is critical for multiplexed optical communications, optical imaging with active wave-front control, and quantum-limited interferometric measurements. Hologram-based mode decomposition devices allow a fast, direct measurement of the mode content, but they have limited precision due to cross-coupling between modes. Here we report the first proof-of-principle demonstration of mode decomposition with a meta-surface, resulting in significantly enhanced precision. A mode-weight fluctuation of 0.6ppm (-62 dB) can be measured with 1 second of averaging at a Fourier frequency of 80 Hz, an improvement on the state-of-the-art by more than three orders of magnitude. The improvement is attributable to the reduction in cross-coupling enabled by the exceptional phase accuracy of the meta-surface. We show a systematic study of the limiting sources of noise, and we show that there is a promising path towards complete mode decomposition with similar precision.

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