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Topic Area: Optoelectronics

Displaying records 21 to 30 of 60 records.
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21. Tensile measurement of single crystal gallium nitride nanowires on MEMS test stages
Topic: Optoelectronics
Published: 4/18/2010
Authors: J. J. Brown, A. I. Baca, Kristine A Bertness, D. A. Dikin, R. S. Ruoff, Victor M. Bright
Abstract: This paper reports the first direct tensile tests on nearly defect free, n-type (Si-doped) gallium nitride single crystal nanowires. Here, for the first time, nanowires have been integrated with actuated, active microelectromechanical (MEMS) structur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902539

22. Direct measurement of vector polarization-mode dispersion from repeated random data by use of linear optical sampling
Topic: Optoelectronics
Published: 3/1/2010
Authors: Paul A Williams, Tasshi Dennis
Abstract: Polarization-dependent optical sampling techniques measure the complex electric field, allowing one to monitor the degrading effects of a communication channel. Here we show the ability to extract the polarization-mode dispersion of the transmission ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903751

23. Optical performance monitoring of QPSK data channels by use of neural networks trained with parameters derived from asynchronous constellation diagrams
Topic: Optoelectronics
Published: 3/1/2010
Authors: Jeffrey A Jargon, Xiaoxia Wu, Alan Willner
Abstract: We demonstrate a technique for optical performance monitoring of quadrature phase-shift keying (QPSK) data channels by simultaneously identifying optical signal-to-noise ratio (OSNR), chromatic dispersion (CD), and polarization-mode dispersion (PMD) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904097

24. Steady-state and transient photoconductivity in c-axis GaN nanowires grown by nitrogen-plasma-assisted molecular beam epitaxy
Topic: Optoelectronics
Published: 2/12/2010
Authors: Norman A Sanford, Paul Timothy Blanchard, Kristine A Bertness, Lorelle Mansfield, John B Schlager, Aric Warner Sanders, Alexana Roshko, Beau Burton, Steven George
Abstract: Analysis of steady-state and transient photoconductivity measurements at room temperature performed on c-axis oriented GaN nanowires yielded estimates of free carrier concentration, drift, mobility, surface band bending, and surface capture coefficie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33133

25. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Topic: Optoelectronics
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902140

26. Traceable waveform calibration with a covariance-based uncertainty analysis
Topic: Optoelectronics
Published: 10/1/2009
Authors: Paul D Hale, Dylan F Williams, Andrew M Dienstfrey, Arkadiusz C. (Arkadiusz) Lewandowski, Tracy S. Clement, Darryl A. Keenan
Abstract: We describe a method for calibrating the voltage that a step-like pulse generator produces at a load at every time point in themeasured waveform. The calibration includes an equivalent-circuit model of the generator that can be used to determine how ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33129

27. Optical performance monitoring of PSK Data Channels using artificial neural networks trained with parameters derived from delay-tap asynchronous diagrams via balanced detection
Topic: Optoelectronics
Published: 9/20/2009
Authors: Jeffrey A Jargon, Xiaoxia Wu, Zhensheng Jia, Loukas Paraschis, Ronald Skoog, Alan Willner
Abstract: We demonstrate a technique of using artificial neural networks for optical performance monitoring of PSK data signals. Parameters for training are derived from delay-tap asynchronous diagrams using balanced detection. We also compare the results wit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902574

28. Applications of artificial neural networks in optical performance monitoring
Topic: Optoelectronics
Published: 8/15/2009
Authors: Jeffrey A Jargon, Xiaoxia Wu, Ronald Skoog, Loukas Paraschis, Alan Willner
Abstract: Applications using artificial neural networks (ANNs) for optical performance monitoring (OPM) are proposed and demonstrated. Simultaneous identification of optical signal-to-noise-ratio (OSNR), chromatic dispersion (CD), and polarization-mode-dispers ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901396

29. Long distance frequency transfer through an optical carrier
Topic: Optoelectronics
Published: 8/2/2009
Author: Paul A Williams
Abstract: Fiber optic networks are an attractive means for the remote distribution of highly stable frequencies from optical clocks. The highest performance is achieved by use of the frequency of the optical carrier itself as the transfer frequency. We will re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903121

30. Full PMD vector measured directly from modulated data using linear optical sampling
Topic: Optoelectronics
Published: 7/15/2009
Authors: Paul A Williams, Tasshi Dennis
Abstract: We demonstrate a new technique to monitor the polarization-mode dispersion in a fiber communication channel by analyzing the modulated data at the fiber output measured with Polarization-Sensitive Linear Optical Sampling (PS-LOS).
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902416