A5102830830- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Advanced Optical Network Technologies
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Optical Wireless Communication Technologies
- Power Line Communications and Noise
- Orbital Angular Momentum in Optics
- Error Correcting Code Techniques
- Advanced Wireless Communication Techniques
- Optical Polarization and Ellipsometry
- Microtubule and mitosis dynamics
- Assisted Reproductive Technology and Twin Pregnancy
- Neural Networks and Reservoir Computing
- Structural Health Monitoring Techniques
- Power Systems and Technologies
- Blind Source Separation Techniques
- Smart Grid Security and Resilience
- Indoor and Outdoor Localization Technologies
- Advanced Statistical Methods and Models
- ECG Monitoring and Analysis
- graph theory and CDMA systems
NEC (United States)
2011-2024
Princeton University
2012-2023
Corning (United States)
2013
Stanford University
2005-2009
Optical fiber transmission is impacted by linear and nonlinear impairments. We study the use of digital backpropagation (BP) in conjunction with coherent detection to jointly mitigate dispersion nonlinearity. propose a noniterative asymmetric split-step Fourier method (SSFM) for solving inverse Schrodinger equation (NLSE). Using simulation results RZ-QPSK transmitted over terrestrial systems inline amplification compensation, we obtain heuristics step size sampling rate requirements, as well...
We study a carrier-synchronization scheme for coherent optical communications that uses feedforward architecture can be implemented in digital hardware without phase-locked loop. derive the equations maximum posteriori joint detection of transmitted symbols and carrier phase. The result is multidimensional optimization problem we approximate with two-stage iterative algorithm: first stage symbol-by-symbol soft detector phase, second hard-decision phase estimator prior subsequent soft-phase...
In this paper, we consider a fractionally spaced equalizer (FSE) for electronic compensation of chromatic dispersion (CD) and polarization-mode (PMD) in dually polarized (polarization-multiplexed) coherent optical communications system. Our results show that the FSE can compensate any arbitrary amount CD first-order PMD distortion, provided oversampling rate is at least 3/2 sufficient number taps are used. contrast, be corrected by symbol-rate only approaches an asymptotic limit, increasing...
We demonstrate mode-division multiplexed WDM transmission over 50-km of few-mode fiber using the fiber's LP 01 and two degenerate 11 modes.A EDFA is used to boost power output signal before a coherent receiver.A 6×6 time-domain MIMO equalizer recover transmitted data.We also experimentally characterize EDFA.
Digital backpropagation (BP) is a universal method for jointly compensating dispersion and nonlinear impairments in optical fiber applicable to signals of any modulation format. In this paper, we compare single carrier (SC) versus orthogonal frequency-division multiplexing (OFDM) polarization-multiplexed transmission. We show that at realistic data rates transmission distances, polarization mode does not significantly degrade the performance BP can be mitigated by post-BP linear equalizer....
We propose a method for controlling modal gain in multimode Erbium-doped fiber amplifier (MM-EDFA) by tuning the mode content of pump. By adjusting powers and orientation input pump modes, dependent can be tuned over large dynamic range. Performance impacts due to excitation undesired coupling macro-bending loss within erbium-doped are also investigated. The MM-EDFA may potentially key element long haul mode-division multiplexed transmission.
Next-generation optical fiber systems will employ coherent detection to improve power and spectral efficiency, facilitate flexible impairment compensation using digital signal processors (DSPs). In a fully system, the electric fields at input output of channel are available DSPs transmitter receiver, enabling use arbitrary precompensation postcompensation algorithms. Linear time-invariant (LTI) impairments such as chromatic dispersion polarization-mode can be compensated by adaptive linear...
We experimentally demonstrate the first few-mode space division multiplexed (SDM) transmission of real-time 10Gb/s Ethernet (10GbE) traffic using commercial small form-factor pluggable SFP + transceivers without coherent detection or multiple input output digital signal processing (MIMO-DSP) over 0.5km elliptical-core few-mode-fiber, achieving <-26dB crosstalk between LP(11e) and LP(11o) modes at 1.3μm.
Record capacity transmission of 101.7-Tb/s (370×294-Gb/s) is performed over 3×55 km SSMF using PDM-128QAM-OFDM modulation and pilot-based phase noise mitigation. Achieved spectral efficiency 11 bits/s/Hz the highest reported to date for WDM transmission.
We demonstrate wavelength- and mode-division multiplexed transmission over a fiber re-circulating loop comprising 50-km of low-DMGD few-mode fiber, an optimized EDFA with reduced wavelength-dependent gain mode-dependent gain. characterize the channel matrix in terms its singular value spread, investigate long-term stability.
Next-generation optical access networks are envisioned to evolve into a converged, high-speed, multiservice platform supporting residential, business, mobile backhaul, and special purpose applications. Moreover, bandwidth demand projections suggest that terabit aggregate capacity may need be reached in such next-generation passive (PON). To satisfy these requirements while leveraging the large investments made existing fiber plants, wavelength division multiplexed (WDM)-based long-reach PON...
Interrogating an object with a light beam and analyzing the scattered can reveal kinematic information about object, which is vital for applications ranging from autonomous vehicles to gesture recognition virtual reality. We show that by change in orbital angular momentum (OAM) of tilted eclipsed moving lateral motion be detected arbitrary direction using single without image reconstruction. observe OAM spectral asymmetry corresponds along axis perpendicular plane containing measurement...
To the best of our knowledge, we present first field trial distributed fiber optical sensing (DFOS) and high-speed communication, comprising a coexisting system, over an operation telecom network. Using probabilistic-shaped (PS) DP-144QAM, 36.8 Tb/s with 8.28-b/s/Hz spectral efficiency (SE) (48-Gbaud channels, 50-GHz channel spacing) was achieved. Employing DFOS technology, road traffic, i.e., vehicle speed density, were sensed 98.5% 94.5% accuracies, respectively, as compared to video...
Recently there is a growing interest in developing few-mode fiber (FMF) based distributed sensors, which can attain higher spatial resolution and sensitivity compared with the conventional single-mode approaches. However, current techniques require two lightwaves injected into both ends of FMF, resulting their complicated setup high cost, causes big issue for geotechnical petroleum applications. In this paper, we present single-end FMF-based sensing system that allows simultaneous...
We review recent advances in distributed fiber optic sensing (DFOS) and their applications. The scattering mechanisms glass, which are exploited for reflectometry-based DFOS, Rayleigh, Brillouin, Raman scatterings. These sensitive to either strain and/or temperature, allowing optical cables monitor ambient environment addition conventional role as a medium telecommunications. Recently, DFOS leveraged technologies developed telecommunications, such coherent detection, digital signal...
We demonstrated 1.05-Pb/s transmission over 3km of multicore fiber with spectral efficiency 109b/s/Hz, using twelve single-mode cores carrying DP-32QAM-OFDM signals and two few-mode DP-QPSK in their LP01 LP11 modes.
We experimentally demonstrate 101.7-Tb/s transmission over 355 km spans of standard single-mode fiber (SSMF) at a net spectral efficiency 11 b/s/Hz. A total 370 dense wavelength-division multiplexed (DWDM) channels spanning the optical C- and L-bands spaced 25 GHz were used. Each 25-GHz channel subdivided into four subbands, with each subband carrying 73.5-Gb/s orthogonal frequency-division (OFDM) signal modulated polarization-division-multiplexing (PDM) 128-ary quadrature amplitude...
We demonstrate mode division multiplexed WDM transmission using the LP01 and LP11 modes of a few fiber. The signal is recovered 6×6 MIMO equalizer at receiver after amplification by EDFA.
With increasing energy consumption of the Internet, it is now imperative to design energy-efficient network architectures and protocols. Optical technologies have significant promise in improving efficiency infrastructures. Future optical backbone networks will be heterogeneous nature where a single link may carry various line-rate signals. This mixed-line-rate (MLR) architecture shown cost effective satisfying traffic demands. In this study, we present mathematical models that can act as...
An artificial neural network (ANN) based transfer learning model is built for quality of transmission (QoT) prediction in optical systems feasible with different modulation formats. Knowledge learned from one system can be transferred to a similar by adjusting weights ANN hidden layers few additional training samples, where highly related information both integrated and redundant discarded. Homogeneous heterogeneous structures are implemented achieve accurate Q-factor-based QoT low...
Distributed fiber optic sensing (DFOS) is a rapidly evolving field that allows the existing optical infrastructure for telecommunications to be reused wide-area sensing. Using backscattering mechanisms of glass—which includes Rayleigh, Brillouin, and Raman backscatter—it possible realize distributed vibration temperature sensors with good sensitivity at every position, spatial resolution determined by bandwidth interrogation signal. In this paper, we will review main technologies in...
We demonstrate a vibration detection and localization scheme based on bidirectional transmission of telecom signals with digital coherent at the receivers. Optical phase is extracted from signal processing blocks receiver, which component by bandpass filtering, position along cable closest to vibration's epicenter recovered correlation. our first using offline experiment 200-Gb/s DP-16QAM, we report field trial results over installed fiber detect real-world events.
We investigate carrier synchronization for coherent detection of optical signals encoding 3 and 4 bits/symbol. consider the effects laser phase noise additive white Gaussian (AWGN), which can arise from local oscillator (LO) shot or LO-spontaneous beat noise. identify 8- 16-ary quadrature amplitude modulation (QAM) schemes that perform well when receiver phase-locked loop (PLL) tracks instantaneous signal with moderate error. propose implementations 16-QAM transmitters using Mach-Zehnder...
We investigate gain equalization in few-mode fibers supporting more than two-mode groups at the signal wavelengths and find that a combination of pump control doping profile optimization is required to equalize mode-dependent gain.