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Topic Area: Optoelectronics
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Displaying records 41 to 50 of 63 records.
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41. Optical performance monitoring using artificial neural networks trained with eye-diagram parameters
Topic: Optoelectronics
Published: 1/1/2009
Authors: Jeffrey A Jargon, Xiaoxia Wu, Alan Willner
Abstract: We developed artificial neural network models to simultaneously identify three separate impairments that can degrade optical channels, namely optical signal-to-noise ratio, chromatic dispersion, and polarization mode dispersion. The neural networks w ...

42. Passive terahertz camera for standoff security screening
Topic: Optoelectronics
Published: 7/1/2010
Authors: Erich N Grossman, Charles Dietlein
Abstract: We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2 m ×4 m(vertical × horizontal) field of ...

43. Photoconductive lifetimes of carbon nanotubes films
Topic: Optoelectronics
Published: 11/29/2007
Authors: Katie Hurst, Richard K. Ahrenkiel, Steve W. Johnston, Anne Dillon, Lara Roberson, John H Lehman
Abstract: The photoconductive recombination lifetimes of carbon nanotube (CNT) thin films as a function of wavelength are measured by resonant-coupled photoconductive decay (RCPCD) method (1). The carrier recombination lifetime is a fundamental property of car ...

44. Photon-number discrimination using a semiconductor quantum dot, optically gated, field-effect transistor
Topic: Optoelectronics
Published: 9/7/2007
Authors: Eric Gansen, Mary A. Rowe, M. Greene, Danna Rosenberg, Todd E Harvey, Mark Su, Sae Woo Nam, Richard P Mirin
Abstract: Detectors capable of resolving the number of photons in a pulse of light are important components for the advancement of quantum information technologies. We demonstrate photon-number discrimination using a novel single-photon detector that utilizes ...

45. Precision Metrology for Fiber-Amplifier Noise Figure Traceable to a RIN Standard
Topic: Optoelectronics
Published: 8/16/2004
Authors: Gregory E Obarski, Paul D Hale
Abstract: We developed high-precision metrology for fiber-amplifier noise figure based on application of a relative intensity noise (RIN) standard to the RIN subtraction method. Calibration of a RIN/noise figure measurement system using the standard yields a t ...

46. Quantum dot single photon sources studied with superconducting single photon detectors
Topic: Optoelectronics
Published: 11/1/2006
Authors: Martin J Stevens, Robert Hadfield, Robert E Schwall, Sae Woo Nam, Richard P Mirin
Abstract: We report the observation of photon antibunching from a single, self-assembled InGaAs quantum dot (QD) at temperatures up to 135 K. The second-order intensity correlation, g(2)(0), is less than 0.260 {+ or -} 0.024 for temperatures up to 100 K. At 12 ...

47. Reflective optical chopper used in NIST high-power laser measurements
Series: Journal of Research (NIST JRES)
Topic: Optoelectronics
Published: 11/1/2008
Authors: Xiaoyu X. Li, Thomas Scott, Christopher L Cromer, Joshua Aram Hadler
Abstract: For the past ten years, NIST has used high-reflectivity, optical choppers as beamsplitters and attenuators when calibrating the absolute responsivity and response linearity of detectors used with high-power CW lasers. The chopper-based technique has ...

48. 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 ...

49. Round-robin testing of carbon nanotubes using Novel and traditional nanometrology tools
Topic: Optoelectronics
Published: 8/26/2007
Authors: John H Lehman, Tom Campbell, Anne Dillon, Roop Mahajan
Abstract: Quantitative, systematic and reproducible metrology of carbon nanotubes is paramount to the fundamental understanding of these promising nanomaterials. Moreover, development of novel techniques which extend the current arsenal of nanotools is also de ...

50. Spectroscopy with a coherent dual frequency comb interferometer at 3.4 µm
Topic: Optoelectronics
Published: 8/1/2010
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, William C Swann, Nathan Reynolds Newbury
Abstract: A coherent dual fiber-comb spectrometer centered at 1.5 µm wavelengths is transferred to 3.4 µm by difference-frequency generation with a 1064 nm cw laser. It is shown that the residual linewidth between the comb teeth at 3.4 µm is resolution-limited ...

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