Optical signal optical processes. Medical search. Frequent questions

This week at the Optical Fiber Conference , Effect Photonics (Effect), a developer of integrated optical communication products has announced that it signed a definitive agreement to acquire the coherent optical digital signal processing and forward error correction technology as well as a highly experienced engineering team from global communications company, Viasat . (optics.org)
This is a single chip solution comprising all active and passive components made from standard silicon photonics available in commercial foundries, with III-V optical amplifiers/lasers integrated on the backside of advanced silicon photonic circuits. (optics.org)
The non-linear functions will be for the first time combined on the same platform, with low losses photonics circuits, for filtering and signal distribution and synchronization. (ec-lyon.fr)
Photonics integration is needed to enable a device that is mobile (small size, small weight, robust (no moving parts), low cost (high volume scalable process flow) and allows fast screening (laser array). (europa.eu)

Early identification of individuals at risk for CVD allows early intervention to halt or reverse the pathological process. (europa.eu)
Such observations provide valuable insights into the underlying physiological and pathological processes, including intricate signaling pathways and cellular interactions. (nih.gov)
This initiative seeks to take advantage of the rapid advances that have taken place in imaging technology, allowing normal and pathological processes to be studied in vivo at the molecular and cellular level. (nih.gov)
The importance of tracking cells throughout the circulatory system, including those of hematopoietic origin, derives from the impact of mobile cells on tissue injury and repair, and the remote targeting of pathological processes such as inflammatory involvement of the heart, lung and blood vessels. (nih.gov)

The purpose of this study is to evaluate the capability of optical coherence tomography (OCT) to detect and analyze the possible defects in several FPD's. (actapress.com)
High-resolution three dimensional view of the human retina acquired with adaptive optics line-scan optical coherence tomography showing the different layers and individual cone photoreceptors as white circular spots. (nih.gov)
The research, led by Ramkumar Sabesan, Ph.D., Department of Ophthalmology, University of Washington School of Medicine, used high-speed phase-resolved optical coherence tomography, which provided resolution of the retina at the cellular level. (nih.gov)

Stochastic processes are widely used as mathematical models of systems and phenomena that appear to vary in a random manner. (wikipedia.org)
Furthermore, seemingly random changes in financial markets have motivated the extensive use of stochastic processes in finance. (wikipedia.org)
Applications and the study of phenomena have in turn inspired the proposal of new stochastic processes. (wikipedia.org)
Examples of such stochastic processes include the Wiener process or Brownian motion process, used by Louis Bachelier to study price changes on the Paris Bourse, and the Poisson process, used by A. K. Erlang to study the number of phone calls occurring in a certain period of time. (wikipedia.org)
These two stochastic processes are considered the most important and central in the theory of stochastic processes, and were discovered repeatedly and independently, both before and after Bachelier and Erlang, in different settings and countries. (wikipedia.org)
The study of stochastic processes uses mathematical knowledge and techniques from probability, calculus, linear algebra, set theory, and topology as well as branches of mathematical analysis such as real analysis, measure theory, Fourier analysis, and functional analysis. (wikipedia.org)
The theory of stochastic processes is considered to be an important contribution to mathematics and it continues to be an active topic of research for both theoretical reasons and applications. (wikipedia.org)
The two types of stochastic processes are respectively referred to as discrete-time and continuous-time stochastic processes. (wikipedia.org)
Discrete-time stochastic processes are considered easier to study because continuous-time processes require more advanced mathematical techniques and knowledge, particularly due to the index set being uncountable. (wikipedia.org)
Probability and stochastic processes for communication systems, including noise. (ohio.edu)

A DWDM-PON is proposed that realizes a spectral efficiency of 1 bit/s/Hz by using homodyne detection based on digital signal processing. (elsevierpure.com)
Differential detection between two optical Rx locations separated by 0.3 cm is employed to eliminate systemic artifacts associated with interfaces of the optical Tx and Rx with the phantoms. (nih.gov)
Explore the use of optical fibre sensing for the acoustic detection of leaks in a 3.5 year, fully-funded PhD. (southampton.ac.uk)
The theory of operation, design of the electric/optical detection configuration and the electronic signal processing method are discussed. (cdc.gov)
We review recent work in some active topics, such as region of interest segmentation algorithms capable of demixing overlapping signals, and new highly accurate algorithms for calcium transient detection. (nih.gov)
Biological Warfare confidence in detection and enhances the signal-to-noise ratio. (cdc.gov)

Integrated optical Kerr frequency combs, or 'micro-combs', have attracted significant interest for RF photonic systems as multi-wavelength sources. (researchsquare.com)
All-optical systems make conversion unnecessary and would be more efficient, as well as potentially faster and more compact. (laserfocusworld.com)
Noise reduction , the recovery of the original signal from the noise-corrupted one, is a very common goal in the design of signal processing systems, especially filters . (wikipedia.org)
With opportunities to explore electrical navigation, autonomous unmanned vehicles, communications and digital signal processing, computer engineering and micro nano devices and systems, you can graduate equipped to immediately excel in your chosen field. (ohio.edu)
In addition, waveguiding systems at microwave and optical frequencies discussed. (ohio.edu)
Research into powerful error correction methods is paramount for the development of high-capacity optical recording systems. (researchgate.net)
development of high-capacity optical recor ding systems. (researchgate.net)
Drawing primarily from the latest emerging technologies, 50/100/200/400 GbE (gigabit Ethernet, IEEE 802.3bs and 802.3cd) and OIF-CEI 4.0 (Optical Internetworking Forum-Common Electrical Interface), we'll look at signal analysis from the perspectives of compliance and debug testing for both components and systems. (tek.com)
PAM4 signaling is being deployed in both single and multichannel systems. (tek.com)
Alternatively, WDM (wavelength division multiplexed) systems combine separate optical PAM4 signals, each with its own wavelength, onto a single SM fiber, Figure 2c. (tek.com)
Delivered a Lecture on Signals and Systems & Digital Signal Processing at Loyola Institute of Technology, Chennai during 24/6/2013-26/6/2013. (svce.ac.in)
Delivered a Lecture on Signals and Systems at Loyola Institute of Technology, Chennai during September 2015. (svce.ac.in)
His team leverages electrical and optical techniques to study ion channels in nerve terminals using a range of experimental systems such as brain slices and cultured cells. (nih.gov)
Development of new molecular probes for conventional imaging techniques such as MRI and ultrasound, and application of new technologies such as optical imaging show great promise, but their use in the cardiovascular, pulmonary, and hematopoietic systems is still limited. (nih.gov)

An IDEAS project to develop signal processing algorithms to improve the quality of ECG data and reduce noise. (nih.gov)

This enforces strict tolerances on the timing of signals propagating in the photonic circuits. (ec-lyon.fr)
Recent years have seen substantial developments in technology for imaging neural circuits, raising the prospect of large scale imaging studies of neural populations involved in information processing, with the potential to lead to step changes in our understanding of brain function and dysfunction. (nih.gov)
We study how neural circuits integrate hormonal, neuropeptide, and monoamine neurotransmitter signaling to control the salience of these triggers and influence related processes in energy homeostasis. (nih.gov)
By combining these optical approaches with behavior tasks and genetic manipulations in rodents, we probe how molecular signals influence the activity of neural circuits involved in the overconsumption of food. (nih.gov)

Micro-combs arise from optical parametric oscillation in ultra-high-Q monolithic micro-ring resonators (MRRs) and offer plenty of advantages compared with conventional multi-wavelength sources, such as larger wavelength number and greatly reduced system complexity and footprint. (researchsquare.com)

An IDEAS project to develop a virtual reality system for studying neural processes in aging. (nih.gov)
Interpreting these conflicting results is problematic because the blood oxygenation level-dependent (BOLD) signal is an indirect measure of neural activity with poor temporal resolution, limiting inferences about whether activity in an area is causally related to (or merely correlated with) a particular cognitive process. (jneurosci.org)
Our current research is focused on how multiple neuromodulator signals like dopamine and neuropeptides converge on a common intracellular molecular signal, cyclic AMP (cAMP), to adjust neural circuit activity. (nih.gov)

We consider here a photonic integrated circuit converting a high-speed optical signal into a sequence of optical pulses, representing the samples extracted with the most accurate timing. (ec-lyon.fr)

Effect says it "now owns the entire optical coherent technology stack. (optics.org)
With this acquisition, Effect says it "will now own the entire coherent technology stack of all optical functions, including a high-performance tunable laser, together with DSP and FEC. (optics.org)
James Regan, CEO of Effect, commented, "This is a significant step in accelerating our ambition to make coherent optical communications ubiquitous and further drive our product portfolio growth. (optics.org)
Optical parametric oscillators are a ubiquitous technology used to generate coherent light at frequencies not accessible by conventional laser gain. (nist.gov)
The proposed concept is experimentally validated through format conversion of a 640 Gbit/s coherent RZ signal to NRZ signal using a simple phase filter implemented by a commercial optical waveshaper. (dtu.dk)
The coherent process takes advantage of a third-order nonlinear optical phenomenon by which three beams are used to probe the sample. (medscape.com)
A fixed pump laser beam and a tunable probe beam are set at a frequency difference that is exactly equal to the frequency of a specific molecular vibration, resulting in the coherent build up of a scattered signal on the anti-Stokes side of the pump laser frequency. (medscape.com)

Our system has great potential to achieve RF and microwave photonic signal generation and processing with low cost and footprint. (researchsquare.com)
An alternative method for photonic-assisted RF signal processing is based on transversal filter system, which offers high reconfigurability and accuracy attributing to the parallel scheme where each channel can be controlled independently. (researchsquare.com)
Yet the border between computing and communication has become somehow blurred when considering emerging research domain such as optical interconnects [1] and photonic neuromorphic computing [2]. (ec-lyon.fr)
All-optical sampling in an integrated photonic circuit is a recent and challenging topic. (ec-lyon.fr)
Optical imaging of live animals has grown into an important tool in biomedical research as advances in photonic technology and reporter strategies have led to widespread exploration of biological processes in vivo . (nature.com)
Photographic methods have been the mainstay for fluorescence and bioluminescence macroscopy in whole animals, but emphasis is shifting to photonic methods that use tomographic principles to noninvasively image optical contrast at depths of several millimeters to centimeters with high sensitivity and sub-millimeter to millimeter resolution. (nature.com)
For photonic imaging to fully realize its potential, however, further progress will be needed in refining optical inversion methods and data acquisition techniques. (nature.com)

Unexpectedly, the crystals exhibited the largest nonlinear optical response of any known crystal. (phys.org)

As well as gaining skills in physics, mechanics, sensing, processing and experimentation, you'll make a valuable contribution to an untapped field of research. (southampton.ac.uk)

However, for these methods, there is a need for complicated modulation schemes, resulting in increased complexity and instability, and also a need for both high-frequency RF signal generators and AWGs, leading to increased cost, size, and power consumption. (researchsquare.com)
The limiting factor on speed for the inverter is the optical-modulation bandwidth of the VCSEL. (laserfocusworld.com)
A team from AT&T has devised a new technique that enables tuning of the modulation spectral efficiency and allows 400 Gb/s signals to be sent over today's 100 gigahertz-grid optical networks over ultra-long distances. (science20.com)
Using the new modulation technique and a new low-loss, large-effective area fiber from OFS Labs, the team transmitted the signals over a record-breaking 12,000 kilometers (roughly 7500 miles)-surpassing their own previous distance record (using the 50 gigahertz-grid) by more than 9000 km. (science20.com)
The proposed optical modulation technique adaptable spectral efficiency. (science20.com)
The table lists the modulation formats used in the experiment for time slots 1 and 2, as well as the modulation formats' spectral widths and the resulting range of adaptable spectral width attainable for the TDM frame from the proposed optical modulation technique. (science20.com)
Optical parameter extraction is achieved for four solid phantom samples using the least-square-error method in MATLAB (for DE) and COMSOL (for FEM) simulation by fitting data to measured results over broadband and narrowband frequency modulation. (nih.gov)
By encoding two bits in each symbol, PAM4 signals use half the bandwidth of the logic-emulating NRZ (non-return to zero) modulation scheme to transmit at the same data rate. (tek.com)

Modulated light fed into the VCSEL inverter (bottom left) results in a measured optical inversion with some peaks (bottom center), in agreement with calculations (bottom right). (laserfocusworld.com)

In probability theory and related fields, a stochastic (/stəˈkæstɪk/) or random process is a mathematical object usually defined as a sequence of random variables, where the index of the sequence has the interpretation of time. (wikipedia.org)

This research program is focused on understanding the mechanisms of exocytosis to learn how the endocrine system controls complex physiological changes in the body, and how the nervous system encodes sensory inputs and processes information. (nih.gov)

Today, several signal-processing functions in computing and telecommunications require that optical signals be converted to electrical ones. (laserfocusworld.com)

The use of AcoustiSens backscattering-enhanced fiber enables the use of existing telecom fiber to backhaul signals from remote sensing installations. (optics.org)
In OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference Article 4528611 (OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference). (elsevierpure.com)
Eight 100 GHz-spaced, 400 Gb/s wavelength-division-multiplexed signals were combined and then transmitted over a re-circulating transmission test platform consisting of 100-km fiber spans. (science20.com)
This shows the measured optical spectrum of the eight 100GHz-spaced 495Gb/s WDM signals at the launch into the transmission fiber. (science20.com)
The researchers will describe their work at the Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference (OFC/NFOEC) in Anaheim, Calif. March 17th-21st. (science20.com)
A single 26 GBd PAM4 signal can be transmitted on either a SM (single mode) or MM (multi mode) fiber, Figure 2a. (tek.com)
To achieve higher data rates, several optical PAM4 signals can be transmitted, each on its own SM or MM fiber, Figure 2b. (tek.com)
A multiplexed because some of the sequences for each probe pair over- array was fabricated by distributing up to 18 different lapped, as probes were designed to be specific to the same microsphere sensors into the optical fiber array with target gene of the BWA. (cdc.gov)

Massoud, T.F. & Gambhir, S.S. Molecular imaging in living subjects: seeing fundamental biological processes in a new light. (nature.com)
Blasberg, R.G. In vivo molecular-genetic imaging: multi-modality nuclear and optical combinations. (nature.com)
Optical imaging (fluorescence), a noninvasive method for quantitative evaluation of integrin expression in tissue, would greatly aid the study of tumor biology even at early stage. (nih.gov)
In this protocol non-invasive optical imaging will be tested as a mean of providing a scientifically reproducible means of assessing different types of tumor cells growth by measuring integrin level in tumor. (nih.gov)
Our approach utilizes high-speed optical imaging techniques and artificial intelligence (AI) methods, enabling objective assessment. (nih.gov)
Molecular imaging can be broadly defined as the in vivo characterization and measurement of biologic processes at the cellular and molecular level. (nih.gov)

He has received several awards, including the NSF Presidential Young Investigator Award, four IBM Faculty Development Awards, an Excellence in Teaching Award from the School of Engineering at USC, two paper awards from the International Association of Pattern Recognition, Society, Technical Achievement and Meritorious Service Awards from the IEEE Signal Processing Society, Technical Achievement and Meritorious Service Awards from the IEEE Computer Society. (umd.edu)
He is a Fellow of the IEEE, the International Association for Pattern Recognition, and Optical Society of America. (umd.edu)

In DCC, synchronization issues arise in the 2D space domain of the image signal. (shaker.eu)

Display-Camera Communication (DCC) is a special form of Visible Light Communication in which digital displays and cameras are utilized for optical free-space data transmission. (shaker.eu)
Optical Reconstruction of Computer-Generated Holograms, Introduction to Digital Holography (2009) 1: 89. (benthamscience.com)
Laser ray signal transmitting digital signal in chip or processor. (euramet.org)

Published paper titled Luminance and Contrast masking based multiscale Image enhancement in national conference on Recent Advancements in signal processing and communication held on 09/03/2015. (svce.ac.in)
Organized National Conference on Signal Processing, Communication & Networking, Department of ECE,Sri Venkateswara College of Engineering,Pennalur on 16th April 2018. (svce.ac.in)
Organized 2-day National Conference on Signal Processing and Communication Engineering, Department of ECE,Sri Venkateswara College of Engineering,Pennalur on 23rd & 24th March 2016. (svce.ac.in)

CARS is a form of Raman spectroscopy whereby the anti-Stokes-shifted Raman signal is used to probe the molecular bonds within a sample. (medscape.com)

When interpreted as time, if the index set of a stochastic process has a finite or countable number of elements, such as a finite set of numbers, the set of integers, or the natural numbers, then the stochastic process is said to be in discrete time. (wikipedia.org)
Accuracy of the extracted optical parameters using finite element method (FEM) simulation is compared to baseline analytical calculations from the diffusion equation (DE) for homogenous brain phantoms. (nih.gov)

Unlike traditional methods that may yield subjective results based on expert interpretation, our method facilitates the study of complex signaling pathways and cellular interactions in a comprehensive and unbiased manner. (nih.gov)

Plus yet more notable product and system news from this week's optical communications expo in San Diego. (optics.org)
Scintil says this IC is designed to boost communications in data centers, High-Performance Computing, and 5G networks, prime users of optical transceivers. (optics.org)
Nikhil Joshi, Adrish Banerjee, and Jeong W. Lee, "Convergence Analysis of TAPPM Decoders for Deep Space Optical Channels," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E95-A, No.8, Aug. 2012. (iitk.ac.in)

We're global leaders in smart electricity grids and microgrids, future wireless networks and artificially intelligent signal processing and networks. (edu.au)

Optical inverters based on various types of diode lasers have been demonstrated since 1990. (laserfocusworld.com)
Vertical-cavity surface-emitting lasers are attractive for optical processing because they offer low power consumption, dense packaging, and a circular output beam. (laserfocusworld.com)
Furthermore, the nonlinear process is intensity dependent, requiring costly and notoriously temperamental short pulse lasers, whereas spontaneous Raman can be conducted with conventional steady state lasers. (medscape.com)

In the system, Nyquist-shaped 400Gb/s signals with tunable spectral efficiency were generated using modulated subcarriers. (science20.com)

However, discrete laser arrays or electro-optical comb sources are employed to establish multiple wavelength channels. (researchsquare.com)
When an injection-locking signal is introduced near the wavelength of the first higher-order mode, most of the power from the VCSEL shifts to the higher-order mode. (laserfocusworld.com)

Owing to the soliton crystal's robust and stable generation as well as the high intrinsic efficiency, RF phase-encoded signal generators and AWGs with simple operation and fast reconfiguration are realized. (researchsquare.com)
1 An efficient, robust all-optical inverter is one step toward building all-optical signal-processing equipment. (laserfocusworld.com)

For Fourier synthesis method [ 18 ], the synthesized signal bandwidth is subject to the resolution of line-by-line spectral shaping. (researchsquare.com)

We compared the transmission performances of 600 Gbit/s PM-64QAM WDM signals over 75.6 km of single-mode fibre (SMF) using EDFA, discrete Raman, hybrid Raman/EDFA, and first-order or second-order (dual-order) distributed Raman amplifiers. (mdpi.com)

On the one hand, optical projection including perspective distortion leads to an unknown position of the display in the camera image. (shaker.eu)
Image Process. (crossref.org)
Prior to joining the University of Maryland, he was an assistant (1981-1986), an associate professor (1986-1991) and director of the Signal and Image Processing Institute (1988-1990) at the University of Southern California (USC), Los Angeles. (umd.edu)
He has co-authored and edited books on MRFs, face and gait recognition and collected works on image processing and analysis. (umd.edu)
His current research interests are face and gait analysis, markerless motion capture, 3-D modeling from video, image and video-based recognition and exploitation and hyper spectral processing. (umd.edu)
Chellappa served as the associate editor for four IEEE Transactions , as a co-editor-in-chief of Graphical Models and Image Processing , and as an editor-in-chief of IEEE Transactions on Pattern Analysis and Machine Intelligence . (umd.edu)
Image Processing, 2003. (umd.edu)
Caliper Life Science's Living Image software automates all the controls and settings required for seamless image acquisition and processing. (mdanderson.org)
Typical X-ray image acquisitions take only 10 seconds and can be overlaid with both optical and photographic images. (mdanderson.org)
Mervin K and Sarala B, Moving object recognition using background subtraction and image processing techniques in, International Journal of Scientific,Engineering and Applied Science, Vol.1, pp.274-282, 2015. (svce.ac.in)

These may be triggered by initial materials defects or by alterations of the technological process. (actapress.com)
To generate a full spectroscopic signature, however, the pump beam has to be tuned to ensure that the different frequencies scan the vibrational spectrum, a process that can take considerable time under current technological constraints. (medscape.com)

The National University of Singapore (NUS) is offering position for postdoctoral fellow who will work closely with Dr. Vincent Tan at the intersection of information theory, statistical signal processing, and machine learning. (timeshighereducation.com)
The candidate is expected to have a PhD in electrical engineering, computer science, or applied mathematics and a strong publication record in information theory, signal processing, or machine learning. (timeshighereducation.com)

A quantitative optical density measure for IgG is also included in this data release. (cdc.gov)

Comprehensive evaluation by simulations of the optical channel as well as experiments with different hardware combinations demonstrate excellent accuracy and reliability of the developed methods compared to state-of-the-art techniques. (shaker.eu)
This chapter analyses how methods of generating, encoding and recording computer-generated hologram affect the results of their optical reconstruction. (benthamscience.com)

We demonstrate a radio frequency (RF) phase-encoded signal generator as well as a user-defined RF arbitrary waveform generator (AWG) based on a soliton crystal micro-comb generated by an integrated MRR with a free spectral range of ~49 GHz. (researchsquare.com)
The soliton crystal micro-comb provides 60 wavelengths for RF phase-encoded signal generators, achieving a phase encoding speed of 5.95 Gb/s and a high pulse compression ratio of 29.6. (researchsquare.com)
Photon dynamics in a phantom are predicted using both analytical and numerical simulation and are related to the measured insertion loss (IL) and insertion phase (IP) for a given geometry based on phantom optical parameters. (nih.gov)
An application from the extramural institution on behalf of the candidate will be required for the NHLBI to process the second phase of the K22. (nih.gov)

He has also served as a member of the IEEE Signal Processing Society Board of Governors and as its Vice President of Awards and Membership. (umd.edu)
He is a Golden Core Member of IEEE Computer Society and served a two-year term as a distinguished lecturer of the IEEE Signal Processing Society. (umd.edu)

Modeling behavior of broadband (30 to 1000 MHz) frequency modulated near-infrared (NIR) photons through a phantom is the basis for accurate extraction of optical absorption and scattering parameters of biological turbid media. (nih.gov)

The goal of our study is to develop a non-invasive optical method for monitoring of HER2 in-vivo and HER2-specific delivery of therapeutic agents to individualize treatment of HER2-positive cancers (breast cancer). (nih.gov)

Here we consider the problem of dealing with high-speed signals in the optical domain needing to be digitized with very high accuracy. (ec-lyon.fr)
High-resolution digitization of high-speed signals is ultimately limited by the accuracy at which the signal is sampled. (ec-lyon.fr)

The terms stochastic process and random process are used interchangeably, often with no specific mathematical space for the set that indexes the random variables. (wikipedia.org)
The values of a stochastic process are not always numbers and can be vectors or other mathematical objects. (wikipedia.org)
A stochastic or random process can be defined as a collection of random variables that is indexed by some mathematical set, meaning that each random variable of the stochastic process is uniquely associated with an element in the set. (wikipedia.org)

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