scholarly journals Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL

2012 ◽  
Author(s):  
H. A. Davani ◽  
B. Kögel ◽  
P. Debernardi ◽  
C. Grasse ◽  
C. Gierl ◽  
...  
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
Polarization Investigation

Short-wavelength, high-speed, Si-based resonant-cavity photodetector

1996 ◽  
Vol 8 (7) ◽  
pp. 927-929 ◽  
Author(s):  
S.S. Murtaza ◽  
H. Nie ◽  
J.C. Campbell ◽  
J.C. Bean ◽  
L.J. Peticolas
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
Resonant Cavity

scholarly journals Coronal mass ejections and high-speed solar wind streams effect on HF ionospheric communication channel

2021 ◽  
Vol 2131 (5) ◽  
pp. 052096
Author(s):  
F I Vybornov ◽  
O A Sheiner
Keyword(s):  
Solar Wind ◽  
Wavelength Range ◽  
Coronal Mass Ejections ◽  
Short Wavelength ◽  
High Speed ◽  
Communication Channel ◽  
Critical Frequency ◽  
Short Wavelength Range ◽  
Speed Solar Wind ◽  
High Speed Solar Wind

Abstract This article analyzes the degree of solar coronal mass ejections and high-speed solar wind streams influence on the ionospheric communication channel in the short-wavelength range. Regularities in the coronal mass ejections influence on the parameters of the ionosphere are revealed. It is shown that there is a decrease in the values of the used differential parameter of critical frequency of the ionosphere F2 layer after the onset of coronal mass ejections of the loop type, while no significant changes are observed from other types of coronal mass ejections. The contribution of the high-speed solar wind flux to the features of the behavior of ionospheric parameters is demonstrated. Deviations of critical frequency and maximum observed frequency of the ionosphere F2 layer indicate a change in conditions in the ionosphere, leading to disruption of radio communication in the short-wavelength range. The results of ground-based measurements of the ionospheric plasma parameters were obtained by the methods of oblique and vertical sounding of the ionosphere. The use of the method of oblique sounding made it possible to obtain data on the state of the ionosphere where there are no vertical sounding stations.

High-speed short-wavelength silicon photodetectors fabricated in 130-nm CMOS process

2003 ◽  
Author(s):  
Sebastian M. Csutak ◽  
Jeremy D. Schaub ◽  
Bo Yang ◽  
Joe C. Campbell
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
Cmos Process

Feature Correlation Velocimetry for Measuring Instantaneous Liquid Sheet Velocity

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
K. S. Siddharth ◽  
Mahesh V. Panchagnula ◽  
T. John Tharakan
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
Cross Correlation ◽  
Ambient Air ◽  
Liquid Sheet ◽  
Bias Error ◽  
High Speed Camera ◽  
Model Predictions ◽  
Feature Correlation ◽  
Spatial Locations

We describe a novel nonintrusive velocimetry technique for measuring the instantaneous velocity field on a liquid sheet. Short wavelength corrugations are naturally formed on the surface of a liquid sheet when the sheet interacts with ambient air. This method, called feature correlation velocimetry (FCV), relies on cross-correlation of such short wavelength corrugations visualized on the liquid sheet surface when captured using a high-speed camera. An experimental setup was created for producing a liquid sheet of known thickness and velocity. After imaging the liquid sheet with a high-speed camera, cross-correlation was employed at various spatial locations on the liquid sheet. To examine the fidelity of the method, laser Doppler velocimetry (LDV) measurements were obtained for a range of flow rates at the same spatial locations and were compared with the FCV values. The FCV values were found to be consistently within 7% of the LDV readings with the FCV measurements being consistently less than those from the LDV. In order to examine the cause of the bias error, a theoretical model of the liquid sheet has been developed. Based on the model predictions, the bias error was observed to scale as U3/2, where U is the local instantaneous liquid sheet velocity. After correcting for this bias error, a good match was observed between the FCV and the LDV readings. As an application of the FCV method, the near-nozzle region of an annular sheet exiting a spray injector has been characterized.

scholarly journals Short-wavelength Reverberant Wave Systems for Enhanced Reservoir Computing

2021 ◽  
Author(s):  
Shukai Ma ◽  
Thomas Antonsen ◽  
Steven Anlage ◽  
Edward Ott
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
Intrinsic Property ◽  
High Sensitivity ◽  
Effective Size ◽  
Reservoir Computing ◽  
General Applicability ◽  
Widespread Application ◽  
Microwave Regime ◽  
Wave Sensitivity

Abstract Machine learning (ML) has found widespread application over a broad range of important tasks. To enhance ML performance, researchers have investigated computational architectures whose physical implementations promise compactness, high-speed execution, physical robustness, and low energy cost. Here, we experimentally demonstrate an approach that uses the high sensitivity of reverberant short wavelength waves for physical realization and enhancement of computational power of a type of ML known as reservoir computing (RC). The potential computation power of RC systems increases with their effective size. We here exploit the intrinsic property of short wavelength reverberant wave sensitivity to perturbations to expand the effective size of the RC system by means of spatial and spectral perturbations. Working in the microwave regime, this scheme is tested on different ML tasks. Our results indicate the general applicability of reverberant wave-based implementations of RC and of our effective reservoir size expansion techniques.

scholarly journals Recent Advances in High Speed Photodetectors for eSWIR/MWIR/LWIR Applications

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 14
Author(s):  
Baile Chen ◽  
Yaojiang Chen ◽  
Zhuo Deng
Keyword(s):  
Short Wavelength ◽  
High Speed ◽  
State Of The Art ◽  
Response Speed ◽  
Optical Fiber Communication ◽  
Fiber Communication ◽  
Long Wavelength ◽  
Speed Performance ◽  
Response Performance ◽  
Long Wavelength Infrared

High speed photodetectors operating at a telecommunication band (from 1260 to 1625 nm) have been well studied with the development of an optical fiber communication system. Recent innovations of photonic systems have raised new requirements on the bandwidth of photodetectors with cutoff wavelengths from extended short wavelength infrared (eSWIR) to long wavelength infrared (LWIR). However, the frequency response performance of photodetectors in these longer wavelength bands is less studied, and the performances of the current high-speed photodetectors in these bands are still not comparable with those in the telecommunication band. In this paper, technical routes to achieve high response speed performance of photodetectors in the extended short wavelength infrared/mid wavelength infrared/long wavelength infrared (eSWIR/MWIR/LWIR) band are discussed, and the state-of-the-art performances are reviewed.

Widely tunable high-speed bulk-micromachined short-wavelength MEMS-VCSEL

2010 ◽  
Author(s):  
Hooman A. Davani ◽  
Christian Grasse ◽  
Benjamin Kogel ◽  
Petter Westbergh ◽  
Christian Gierl ◽  
...  
Keyword(s):  
Short Wavelength ◽  
High Speed
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