Results 11 to 20 of about 7,545,238 (204)

The Self-Coherent Camera: a new tool for planet detection [PDF]

Proceedings of the International Astronomical Union, 2005
The performance of high contrast imaging systems is very often limited by the presence of static speckles in the point-spread function of the central source. Several techniques have already been proposed to discriminate a faint companion from these residual speckles.
Baudoz, Pierre, Boccaletti, Anthony, Baudrand, Jacques, Rouan, Daniel   +3 more
openaire   +2 more sources

Advanced optical receiver architectures for ultra-high capacity but low-cost short-reach optical interconnects

Dianxin kexue, 2022
The deployment of emerging network infrastructure such as hyper-scale datacenters urgently requires ultra-high capacity but low-cost short-reach optical interconnects.Conventional intensity modulation and direct detection possesses a simple receiver ...
Honglin JI, Xueyang LI, Zhixue HE, Weisheng HU, Shieh William   +4 more
doaj   +2 more sources

Digital self-coherent detection

Optics Express, 2008
We review recent progresses on digital self-coherent detection of differential phase-shift keyed (DPSK) signal using orthogonal differential direct detection followed by high-speed analog-to-digital conversion and digital signal processing (DSP). Techniques such as data-aided multisymbol phase estimation for receiver sensitivity enhancement, unified ...
Xiang, Liu, S, Chandrasekhar, Andreas, Leven   +2 more
openaire   +2 more sources

100G FSO Transmission Using 3-Bit DAC and Self-Coherent Detection

Optical Fiber Communication Conference (OFC) 2023, 2023
Using a virtual-carrier-assisted self-coherent system aided by a digital resolution enhancement technique, we experimentally demonstrate 100 Gbps FSO transmission over an out-door 42 m link, supported by a single photoreceiver and a simplified transmitter with a 3-bit DAC.
Romil K. Patel, Guilherme A. Domingues, Nelson J. Muga, Armando N. Pinto, Marco A. Fernandes, Gil M. Fernandes, Paulo P. Monteiro, Fernando P. Guiomar   +7 more
openaire   +3 more sources

Coherent scatterers detection: application over glacier terrain using TerraSAR-X time series data [PDF]

, 2011
This paper investigates the detection of Coherent Scatterers (CSs) in ice and glacier terrain by means of TerraSAR-X time series data in the test site of the Helheim Glacier in Greenland.
Maria J. Sanjuan-Ferrer, Hajnsek, Irena, Papathanassiou, Kostantinos P., Kostantinos P. Papathanassiou, Sanjuan-Ferrer, Maria J., Irena Hajnsek   +5 more
core   +1 more source

Homodyne coherent detection of ASK and PSK signals performed by a subcarrier optical phase-locked loop [PDF]

, 2005
Optical transmission systems based on homodyne coherent detection of 2-ASK and pilot carrier 2-PSK signals have been implemented. ASK data has been transmitted at 2.5 Gbps, while 2.5 Gbps and 10 Gbps PSK systems have been tested.
S. Camatel, Ferrero, Valter, CAMATEL S, V. Ferrero, Camatel, S.   +4 more
core   +2 more sources

Automated Surface Defect Inspection Based on Autoencoders and Fully Convolutional Neural Networks

Applied Sciences, 2021
This study aims to develop a novel automated computer vision algorithm for quality inspection of surfaces with complex patterns. The proposed algorithm is based on both an autoencoder (AE) and a fully convolutional neural network (FCN). The AE is adopted
Cheng-Wei Lei, Li Zhang, Tsung-Ming Tai, Chen-Chieh Tsai, Wen-Jyi Hwang, Yun-Jie Jhang   +5 more
doaj   +1 more source

A self-coherent receiver for detection of
PolMUX coherent signals

Optics Express, 2012
A self-coherent receiver capable of demultiplexing PolMUX-signals without an external polarization controller is presented. Training sequences are introduced to estimate the polarization rotation, and a decision feedback recursive algorithm mitigates the random walk of the recovered field.
Li, Jingshi, Schmogrow, Rene, Hillerkuss, David, Schindler, Philipp C., Nazarathy, Moshe, Schmidt-Langhorst, Carsten, Ezra, Shalva-Ben, Tselniker, Igor, Koos, Christian, Freude, Wolfgang, Leuthold, Juerg   +10 more
openaire   +4 more sources

Coherent scatterers detection in glacier environments by means of TerraSAR-X images [PDF]

, 2010
This paper investigates the detection of Coherent Scatterers (CSs) in Ice and Glacier terrain by means of Ter-raSAR-X images in the test case of the Helheim Glacier in Greenland.
Papathanassiou, Konstantinos P., Hajnsek, Irena, Sanjuan-Ferrer, Maria J.   +2 more
core   +1 more source

One-BEC-species coherent oscillations with frequency controlled by a second species atom number

New Journal of Physics, 2022
Controlling the tunneling of atoms of one species using a different atom species is a fundamental step in the development of a new class of atom quantum devices, where detection, motion control, and other functions over the atoms, can be achieved by ...
L Morales-Molina, E Arévalo
doaj   +1 more source