A turn-key optoelectronic oscillator with low acceleration sensitivity
We present the experimental results of the first fully packaged optoelectronic oscillator module operating at 11 GHz.
photonics frequency stability acceleration sensiti↗
Engineering topics
Yao, S.
Publications and source records attributed to Yao, S..
Optical Pulse Synthesis Using Brillouin Selective Sideband Amplification
Optical pulse generation using Fourier synthesis is attractive for a number of applications, including photonic A/D conversion, electro-optic sampling, and time-resolved spectroscopy, because the bandwidth, shape, and repetition rate of the pulse can be easily controlled.
optical pulse brillouin selective sideband↗
Frequency-Converted, Polarization Insensitive, and Dispersion Immune Photonic Link with Brillouin
We demonstrate a novel photonic link that simultaneously achieves frequency conversion, optical amplification, polarization sensitivity elimination, and fiber dispersion effect minimization.
OEO Photonics Oscillator optoelectronic oscillator↗
New Schemes for Improved Opto-Electronic Oscillator
The opto-Electronic Oscillator (OEO)has already demonstrated superior spectral purity as a for microwave and millimeter wave reference signals.
OEO↗
Realization of Ultra-High Spectal Purity with the Opto-Electronic Oscillator
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Oscillator clock spectral purity optoelectronics↗
Monolithically Integrated InGaAsP/InP Laser/Modulator Using Identical Layer Approach for Opto-Electronic Oscillator
In this paper, we will present the design and fabrication of an integrated semiconductor laser/modulator using the identical active layer approach on InGaAsP/InP material.
Laser Modulator Mode-locked lasers microwave gener↗
Brillouin Amplification--A powerful New Scheme for Microwave Photonic Communications
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narrow bandwidth emission noise analog photonic sy↗
Brillouin Amplification--A Powerful New Scheme for Microwave Photonic Communications
We introduce the Brillouin selective sideband amplification technique and demonstrate many important applications of this technique in photonic microwave systems, including efficient phase modulation to amplitude modulation conversion, photonic frequency multiplication, photonic signal mixing with gain, and frequency multiplied signal up conversion.
systems Stimulated Brillouin Scattering (SBS) side↗
Brillouin Opto-Electronic Oscillator
We demonstrate an all optical Opto-Electronic Oscillator in which the Brillouin selective sideband amplification technique is used to provide a sufficient gain for the oscillator to start and sustain an electro-optic oscillation.
OEO electro-optic oscillation↗
Brillouin Selective Sideband Amplification of Microwave Photonic Signals
We introduce a powerful Brillouin selective sideband amplification technique and demonstrate its application for achieving gain in photonix signal up- and down- conversions in microwave photonic systems.
sideband amplication↗
A New Class Of Opto-Electronic Oscillators (OEO) for Microwave Signal Generation and Processing
A new class of oscillators based on photonic devices is presented. These opto-electronic oscillators (OEO's) generate microwave oscillation by converting continuous energy from a light source using a feedback circuit which includes a delay element, and electro-optic switch, and a photodetector. Different configurations of OEO's are presented, each of which may be applied to a particular application requiring ultra-high performance, or low cost and small size.
oscillators↗
New Results with the Opto-Electronic Oscillators (OEO)
A new class of oscillators based on photonic devices is presented. These opto-electronic oscillators (OEOs) generate microwave oscillation by converting continuous energy from a light source using a feedback circuit which includes a delay element, an electro-optic switch, and a photodetctor.
photonic devices opto-electronic oscillators OEOs ↗
Preliminary Evaluation of Thematic Mapper Image Data Quality
Improvements in the ability to monitor renewable resources/vegegation due to improvements in the spatial, spectral and radiometric resolution of TM data were evaluated. Results presented from the first 4 months of analysis presented include: (1) geometric performance; (2) band-to-band registration; (3) modulation transfer function; and (4) crop separabililty performance. Crop separability in Webster County, Iowa and in Mississippi County, Arkansas as determined by cluster and principal components analyses is assessed.
Macdonald, R. B.↗
Preliminary Evaluation of Thematic Mapper Image Data Quality
Thematic Mapper (TM) data from Mississippi County, Arkansas, and Webster County, Iowa, were examined for the purpose of evaluating the image data quality of the TM which was launched on board the LANDSAT-4 spacecraft. Preliminary clustering and principal component analysis indicates that the middle infrared and thermal infrared data of TM appear to add significant information over that of the near IR and visible bands of the multispectral scanner data. Moreover, the higher spatial resolution of TM appears to provide better definition of the edges and the within variability of agricultural fields. The geometric performance of TM data, without ground control correction, was found to exceed expectations. The modulation transfer function for the 1.65 m band was found to agree with prelaunch specifications when the effects of the GSFC cubic convolution and the atmosphere were removed. The band to band registration for the bands within the noncooled focal plane was found to be better than specified. However, the middle infrared and thermal infrared, which are on a separate cooled focal plane were found to be misregistered and were significantly worse than prelaunch specifications.
Macdonald, R. B.↗
Filament-winding fabrication of QCSEE configuration fan blades
The design and fabrication of twelve NASA-QCSEE type composite fan blades utilizing wet filament winding fabrication techniques is described. All composite fibers were continuous and attached to the root end. All components were formed, bonded, and co-cured in one molding process. Advanced fiber materials used in the blade fabrication were Thornel-300, Carbolon Z-2-1, and Carbolon Z-3 graphite in an epoxy resin matrix.
Yao, S.↗
Composite hub/metal blade compressor rotor
A low cost compressor rotor was designed and fabricated for a small jet engine. The rotor hub and blade keepers were compression molded with graphite epoxy. Each pair of metallic blades was held in the hub by a keeper. All keepers were locked in the hub with circumferential windings. Feasibility of fabrication was demonstrated in this program.
Yao, S.↗
Filament-wound spar shell graphite/epoxy fan blades
The methodology for fabrication of wet filament wound spar shell fan blades is presented. All principal structural elements were filament wound, assembled, formed, bonded and co-cured in a female mold. A pair of blades were fabricated as one integral unit and parted into two after curing.
Yao, S.↗