Amplified O-band direct-detection transmission using bismuth-doped fiber amplifiers

2021 ◽  
Author(s):  
Yang Hong ◽  
Kyle Bottrill ◽  
Natsupa Taengnoi ◽  
Naresh Thipparapu ◽  
Yu Wang ◽  
...  
Keyword(s):  
Direct Detection ◽  
Fiber Amplifiers

2.488 Gb/s-318 km repeaterless transmission using erbium-doped fiber amplifiers in a direct-detection system

1992 ◽  
Vol 4 (2) ◽  
pp. 179-182 ◽  
Author(s):  
Y.K. Park ◽  
S.W. Granlund ◽  
T.W. Cline ◽  
L.D. Tzeng ◽  
J.S. French ◽  
...  
Keyword(s):  
Direct Detection ◽  
Detection System ◽  
Fiber Amplifiers ◽  
Erbium Doped

Performance improvement of direct detection systems using local and/or long-distance-pumped fiber amplifiers

1992 ◽  
Author(s):  
Anders Bjarklev ◽  
Joern H. Povlsen ◽  
Karsten Rottwitt ◽  
Ole Lumholt ◽  
Thomas P. Rasmussen
Keyword(s):  
Performance Improvement ◽  
Direct Detection ◽  
Fiber Amplifiers ◽  
Long Distance ◽  
Detection Systems

Performance improvement of direct detection systems using local and/or long-distance pumped fiber amplifiers

1991 ◽  
Vol 10 (3) ◽  
pp. 215-223
Author(s):  
Anders Bjarklev ◽  
J⊘rn Hedegaard Povlsen ◽  
Karsten Rottwitt ◽  
Ole Lumholt ◽  
Thomas Rasmussen
Keyword(s):  
Performance Improvement ◽  
Direct Detection ◽  
Fiber Amplifiers ◽  
Long Distance ◽  
Detection Systems

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

A novel enzyme immunoassay for the direct detection of H. pylori antigens in stool

2001 ◽  
Vol 120 (5) ◽  
pp. A492-A493 ◽  
Author(s):  
E HAINDL ◽  
H BENESCH ◽  
A FINCK ◽  
V MUEHISTEIN ◽  
A LEODOLTER ◽  
...  
Keyword(s):  
Enzyme Immunoassay ◽  
Direct Detection ◽  
H Pylori
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