A5086528361- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Advanced Wireless Communication Techniques
- Semiconductor Lasers and Optical Devices
- Blind Source Separation Techniques
- Neural Networks and Reservoir Computing
- Advanced Optical Network Technologies
- Advanced Image Processing Techniques
- Error Correcting Code Techniques
- Image and Signal Denoising Methods
- Power Line Communications and Noise
- Advanced Image Fusion Techniques
- Spectroscopy and Laser Applications
- Photonic Crystal and Fiber Optics
- Atmospheric Ozone and Climate
- Terahertz technology and applications
Cablevision (United States)
2024
Stanford University
2016-2023
Nokia (United States)
2018-2019
Korea Aerospace University
2018
The University of Texas at Austin
2013
We demonstrate mode-multiplexed 90×90 MIMO transmission over all nine mode groups of a 26.5-km graded-index multimode fiber span, achieving record spectral efficiency 202 bit/s/Hz.
A Mach-Zehnder mesh (MZM), which is comprised of a network tunable 2 × interferometers and embedded photodetectors (PDs), can be used to perform arbitrary unitary matrix multiplications in the optical domain compensate modal crosstalk short-reach mode-division-multiplexed (MDM) links that use direct detection (DD). MZMs adapted using self-configuration method, proposed by Miller, where multiple low-speed low-power code sequences are superimposed on parallel high-speed information streams. We...
Mode-dependent loss and gain (MDL MDG) of multimode components are fundamental impairments that reduce the capacity mode-division-multiplexed (MDM) systems. MDL is commonly quantified either in terms root mean square (rms) or peak-to-peak (P-P) variations. It incorrect to specify only P-PMDL if they be used an MDM system with nonnegligible mode coupling, because system's overall coupled gains random variables whose statistics cannot determined from P-P values. On other hand, measurements rms...
Acquiring High Resolution (HR) Magnetic Resonance (MR) images requires the patient to remain still for long periods of time, which causes discomfort and increases probability motion induced image artifacts. A possible solution is acquire low resolution (LR) process them with Super Generative Adversarial Network (SRGAN) create an HR version. LR a lower scan time than acquiring images, allows higher comfort scanner throughput. This work applies SRGAN MR prostate improve in-plane by factors 4...
Environmental perturbations, such as wind, mechanical stress, temperature, and lightning, impose microsecond-time-scale changes to the transfer matrix of a multimode fiber (MMF), necessitating adaptive multiple-input multiple-output (MIMO) equalization track time-varying channel. It is significant interest accurately model channel dynamics so that MIMO algorithms can be optimized their impact on digital signal processing complexity performance assessed. We propose dynamic using coupled-mode...
Motivated by the recent interest in single-mode semiconductor optical amplifiers and multimode erbium-doped fiber amplifiers, we present a unified, comprehensive treatment of effect polarization- mode-dependent gain (PDG MDG) on capacity ultra-long-haul transmission systems. We study problem using simulations multisection model, including effects PDG or MDG polarization mode dispersion (PMD) modal dispersion. also analytically derive exact expressions for distribution PDG-impaired In...
Sudden environmental effects, such as mechanical vibration, wind, and lightning, impart microsecond-timescale changes to the transmission matrix of multimode optical fibers. We introduce a timescale parameter characterize rate channel in mode-division-multiplexed (MDM) links. show how efficiently generate continuous unitary matrices that form basis for simplified, yet general, dynamic model incorporating effects modal dispersion, mode-dependent loss, time-varying mode coupling. fast...
The rich design landscape of optical fibers offers many opportunities for refractive index optimization. In particular, the profiles multimode (MMFs) and multicore (MCFs) govern behavior spatial polarization modes, including their bandwidth, mode count, coupling, modal dispersion, chromatic mode-dependent loss. this article, we obtain update equations to optimize shapes fiber various applications using gradient descent. Starting with an initial designed according standard best practices, our...
We investigate the vibration sensitivity of spatially multiplexed links by measuring mode-coupling dynamics a four-core coupled-core fiber and reference single-mode fiber. show that speed increases with mode count.
We show by analysis and simulation of a multisection model that polarization- or mode-dependent gain from single-mode semiconductor optical amplifiers multimode erbium-doped fiber causes the channel capacity with minimum-mean-square error detection to become substantially lower than optimal maximum likelihood detection. However, loss can be mitigated techniques such as successive interference cancellation (SIC) retain reasonable complexity. reaffirm frequency diversity enables outage...
The effect of mode-dependent gain in ultra-long-haul optical SDM systems with coupled channels is reviewed. Simulation results indicate stringent MDG requirements for future amplifiers. Challenges estimation are also addressed.
We present a novel TFDM coherent PON architecture supporting adaptable modulation across subcarriers. Experimental validation highlights its flexibility in various link distance/splitting configurations, featuring out-of-band communication Downstream broadcasting and upstream burst transmission were demonstrated. ©2024 The Author(s)
We demonstrate a TFDM coherent PON with low-cost ECL-free ONU, enabled by remote optical carrier delivery through injection locking. Experimental demonstration of 50 km transmission shows similar performance to regular ECL-based systems.
We show mode-multiplexed transmission over individual mode groups up to 9 of a 27 km long graded-index multimode fiber. also investigate distances 500 using recirculating loop arrangement for the first 6 QPSK and 16-QAM signals.
We propose a dynamic channel model to describe time-varying polarization- and spatial-mode coupling in few-mode fibers caused by fast environmental perturbations. employ the study tracking performance of adaptive multi-input multi-output equalization algorithms.
Channel models for simulating the time dependence of propagation matrices in mode-division-multiplexed systems are reviewed. The impact channel dynamics on adaptive equalization long-haul links using coherent detection and short-reach direct also discussed.
We present latest advances in multimode fibers and components for mode-multiplexed transmission. In particular we will review large mode count mode-multiplexer characterization techniques provide a summary of the transmission results. © 2019 The Author(s)
We present latest advances in multimode fibers and components for mode-multiplexed transmission. In particular we will review large mode count mode-multiplexer characterization techniques provide a summary of the transmission results.
We review the fundamentals of MDG and its impact on capacity ultra-long-haul systems. also study sub-optimal MMSE detection system capacity. Our results dictate stringent requirements for SDM amplifiers to ensure capacities equivalent uncoupled transmission.
We propose a simplified dynamic channel model for mode-division multiplexing (MDM) that uses reduced parameter set simulation. discuss the implications of dynamics on adaptive multiple-input multiple-output (MIMO) equalization.
Adaptive optical multi-input multi-output (MIMO) signal processing is employed to compensate for intermodal coupling in short-reach direct-detection mode-division multiplexing systems. Complexity minimized by cascading two stages of fundamentally lossless devices. All modes are first separated a fixed demultiplexer, such as mode-selective photonic lantern or multi-plane converter. Coupling within different mode groups then compensated independently using adaptive 2×2 4×4 MIMO Mach-Zehnder...