Search results for: Erik Agrell

Items from 1 to 20 out of 123 results

article

The Optimal Lattice Quantizer in Nine Dimensions

Bruce Allen, Erik Agrell

Annalen der Physik > 533 > 12 > n/a - n/a

The optimal lattice quantizer is the lattice that minimizes the (dimensionless) second moment G. In dimensions 1 to 3, it has been proven that the optimal lattice quantizer is one of the classical lattices, and there is good numerical evidence for this in dimensions 4 to 8. In contrast, in 9 dimensions, more than two decades ago, the same numerical studies found the smallest known value of G for a...

article

Performance Metrics for Systems With Soft-Decision FEC and Probabilistic Shaping

Tsuyoshi Yoshida, Magnus Karlsson, Erik Agrell

IEEE Photonics Technology Letters > 2017 > 29 > 23 > 2111 - 2114

High-throughput optical communication systems utilize binary soft-decision forward error correction (SD-FEC) with bit interleaving over the bit channels. The generalized mutual information is an achievable information rate (AIR) in such systems and is known to be a good predictor of the bit error rate after SD-FEC decoding (post-FEC BER) for uniform signaling. However, for probabilistically shaped...

article

Scalability analysis methodology for passive optical interconnects in data center networks using PAM

R. Lin, Krzysztof Szczerba, Erik Agrell, Lena Wosinska, more

Optics Communications > 2017 > 403 > C > 283-289

A framework is developed for modeling the fundamental impairments in optical datacenter interconnects, i.e., the power loss and the receiver noises. This framework makes it possible, to analyze the trade-offs between data rates, modulation order, and number of ports that can be supported in optical interconnect architectures, while guaranteeing that the required signal-to-noise ratios are satisfied...

chapter

Capacity scaling of flexible optical networks with nonlinear impairment

Li Yan, Erik Agrell

2017 19th International Conference on Transparent Optical Networks (ICTON) > 1 - 4

2017 19th International Conference on Transparent Optical Networks (ICTON)

Efficient resource utilization with a satisfying quality of service is the key to high capacity in flexible optical networks. In our work, this is achieved by supporting the resource allocation with the Gaussian noise model, which estimates the nonlinear physical-layer impairments. The study includes variable launch power, modulation formats, error-correcting code rates, and various new network features...

article

PAM Performance Analysis in Multicast-Enabled Wavelength-Routing Data Centers

Houman Rastegarfar, Li Yan, Krzysztof Szczerba, Erik Agrell

Journal of Lightwave Technology > 2017 > 35 > 13 > 2569 - 2579

Multilevel pulse amplitude modulation (

$M$

-PAM) is gaining momentum for high-capacity and power-efficient cloud computing. Compared to the classic on–off keying (OOK) modulation, high-order PAM yields better spectral efficiency but is also more susceptible to physical layer degradation effects. We develop a cross-layer analysis framework to examine the PAM transmission performance in data center...

chapter

A novel demodulation scheme for a memoryless optical interference channel

Kamran Keykhosravi, Erik Agrell

2017 IEEE International Symposium on Information Theory (ISIT) > 66 - 70

2017 IEEE International Symposium on Information Theory (ISIT)

Matched filtering and sampling, which is known to be the optimal receiver for the linear additive white Gaussian noise channel, is in general suboptimal for a nonlinear medium. Nonetheless, it is commonly used in fiber-optical communication systems with nonlinear distortion. In this paper, a novel demodulation scheme is proposed for a two-user memoryless interference channel, with a type of nonlinear...

chapter

Modified digital backpropagation accounting for polarization-mode dispersion

Cristian B. Czegledi, Gabriele Liga, Domanic Lavery, Magnus Karlsson, more

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

We propose a modified DBP algorithm accounting for PMD. The accumulated PMD at the receiver is factorized into several PMD sections, and inserted into the DBP routine to distributively compensate for PMD, outperforming the conventional approach by 1.1 dB in SNR.

chapter

Achievable rates of multidimensional multisphere distributions

Johnny Karout, Rene-Jean Essiambre, Erik Agrell, Antonia Tulino

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

The mutual information (MI) of multidimensional multisphere distributions in arbitrary dimensions in the presence of additive white Gaussian noise is derived. We show for instance that 2-D distributions have higher MI than 4-D ones in a range of signal-to-noise ratios.

chapter

Temporal stochastic channel model for absolute polarization state and polarization-mode dispersion

Cristian B. Czegledi, Magnus Karlsson, Pontus Johannisson, Erik Agrell

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

We propose and validate a discrete-time channel model for the temporal drift of the absolute polarization state and polarization-mode dispersion for coherent fiber optic systems. The model can be used in simulations to test and develop DSP for coherent receivers.

chapter

An impairment-aware resource allocation scheme for dynamic elastic optical networks

Nishan Dharmaweera, Li Yan, Magnus Karlsson, Erik Agrell

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

By using impairment-driven variable guardbands, our proposed dynamic resource allocation scheme accommodates 50% more traffic in comparison to existing fixed transmission-reach- and guardband-based algorithms.

chapter

Phase-noise compensation for spatial-division multiplexed transmission

Arni F. Alfredsson, Erik Agrell, Henk Wymeersch, Magnus Karlsson

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

The problem of correlated phase noise in spatial-division multiplexed transmission is studied. To compensate for the phase noise, an algorithm for joint-core phase-noise estimation and symbol detection is proposed, which outperforms conventional methods.

chapter

Network performance trade-off in optical spatial division multiplexing data centers

Li Yan, Matteo Fiorani, Ajmal Muhammad, Massimo Tornatore, more

2017 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2017 Optical Fiber Communications Conference and Exhibition (OFC)

We propose close-to-optimal network resource allocation algorithms for modular data centers using optical spatial division multiplexing. A trade-off between the number of established connections and throughput is identified and quantified.

article

Joint Assignment of Power, Routing, and Spectrum in Static Flexible-Grid Networks

Li Yan, Erik Agrell, Madushanka Nishan Dharmaweera, Henk Wymeersch

Journal of Lightwave Technology > 2017 > 35 > 10 > 1766 - 1774

This paper proposes a novel network planning strategy to jointly allocate physical layer resources together with the routing and spectrum assignment in transparent nonlinear flexible-grid optical networks with static traffic demands. The physical layer resources, such as power spectral density, modulation format, and carrier frequency, are optimized for each connection. By linearizing the Gaussian...

article

High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers

Benjamin J. Puttnam, Ruben S. Luis, Erik Agrell, Georg Rademacher, more

Journal of Lightwave Technology > 2017 > 35 > 6 > 1157 - 1167

We discuss optical transmission using homogeneous, single-mode, multicore fibers. We first describe the key fiber properties that can affect transmission, such as intercore crosstalk and the variation of propagation delay between cores, and the consequences of these properties on spatial super-channel transmission. We then describe a series of experiments and demonstrations of system features including...

article

Multidimensional Modulation and Coding in Optical Transport

Magnus Karlsson, Erik Agrell

Journal of Lightwave Technology > 2017 > 35 > 4 > 876 - 884

This paper reviews the performance of optimized modulation formats in two, four, and eight dimensions. We present performance (lower bounds) for higher dimensions by exploiting known performance of binary block codes. Ultimately, the achievable information rates of given modulation formats and receiver types are limited by the mutual information and generalized mutual information. We exemplify how...

article

Information Rates of Next-Generation Long-Haul Optical Fiber Systems Using Coded Modulation

Gabriele Liga, Alex Alvarado, Erik Agrell, Polina Bayvel

Journal of Lightwave Technology > 2017 > 35 > 1 > 113 - 123

A comprehensive study of the coded performance of long-haul spectrally-efficient WDM optical fiber transmission systems with different coded modulation decoding structures is presented. Achievable information rates are derived for three different square quadrature-amplitude modulation (QAM) formats and the optimal format is identified as a function of distance and specific decoder implementation....

chapter

Optical circuit granularity impact in TCP-dominant hybrid data center networks

Houman Rastegarfar, Kamran Keykhosravi, Krzysztof Szczerba, Erik Agrell, more

2017 International Conference on Computing, Networking and Communications (ICNC) > 318 - 322

2017 International Conference on Computing, Networking and Communications (ICNC)

Hybrid networking, based on electronic packet switching and optical circuit switching, has been proposed to resolve the existing switching bottlenecks in data centers in an energy-efficient and cost-effective fashion. We consider the problem of resource provisioning in hybrid data centers in terms of optical circuit switching capacity and granularity. The number of fibers connected to server racks,...

chapter

Multicast scheduling for optical data center switches with tunability constraints

Kamran Keykhosravi, Houman Rastegarfar, Erik Agrell

2017 International Conference on Computing, Networking and Communications (ICNC) > 308 - 312

2017 International Conference on Computing, Networking and Communications (ICNC)

Optical multicasting based on passive star couplers and fast tunable transceivers is an attractive solution for the throughput and latency requirements of many data center applications. The limited tuning range of transceivers, however, may not be sufficient enough to enable the flexible scheduling of traffic. In this paper, we propose a suite of scalable scheduling algorithms for opticalmulticast...

chapter

Achievable information rates of nonbinary codes for optical fiber transmission

Gabriele Liga, Alex Alvarado, Polina Bayvel, Erik Agrell

2016 IEEE Photonics Conference (IPC) > 309 - 310

2016 IEEE Photonics Conference (IPC)

Achievable information rates (AIRs) are calculated for optical fiber systems employing soft-decision and hard-decision nonbinary codes. We show that, despite the lower decoding complexity, hard-decision AIRs approach soft-decision AIRs for high spectral efficiencies and long transmission distances.

article

Joint-Polarization Phase-Noise Estimation and Symbol Detection for Optical Coherent Receivers

Arni F. Alfredsson, Rajet Krishnan, Erik Agrell

Journal of Lightwave Technology > 2016 > 34 > 18 > 4394 - 4405

The problem of optimal symbol detection in the presence of laser phase noise is studied, for uncoded polarization-multiplexed fiber-optic transmission. To this end, the maximum a posteriori (MAP) symbol detector is presented. Specifically, it is emphasized that obtaining phase-noise point estimates, and treating them as the true values of the phase noise, is in general suboptimal. Furthermore, a pilot-based...

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MODULATION (39)
SIGNAL TO NOISE RATIO (32)
OPTICAL FIBER COMMUNICATION (30)
DECODING (26)
BIT ERROR RATE (19)
OPTICAL RECEIVERS (19)
BANDWIDTH (17)
FORWARD ERROR CORRECTION (15)
OPTICAL FIBER NETWORKS (15)
RECEIVERS (14)
MUTUAL INFORMATION (13)
NONLINEAR OPTICS (12)
OPTICAL TRANSMITTERS (11)
ADAPTIVE OPTICS (10)
GAIN (10)
OPTICAL POLARIZATION (10)
RESOURCE MANAGEMENT (10)
DETECTORS (9)
LABELING (9)
OPTICAL MODULATION (9)
BIT-INTERLEAVED CODED MODULATION (8)
DIGITAL SIGNAL PROCESSING (8)
DISPERSION (8)
VECTORS (8)
APPROXIMATION METHODS (7)
CODED MODULATION (7)
NOISE (7)
PHASE NOISE (7)
SENSITIVITY (7)
CHANNEL CAPACITY (6)
LATTICES (6)
OPTICAL NOISE (6)
OPTICAL PULSES (6)
OPTIMIZATION (6)
PARITY CHECK CODES (6)
PHASE SHIFT KEYING (6)
MEASUREMENT (5)
OPTICAL COMMUNICATIONS (5)
OPTICAL FIBERS (5)
QUADRATURE AMPLITUDE MODULATION (5)
ROUTING (5)
WAVELENGTH DIVISION MULTIPLEXING (5)
AWGN CHANNELS (4)
BINARY LABELING (4)
COMPLEXITY THEORY (4)
DEMODULATION (4)
ENCODING (4)
ITERATIVE DECODING (4)
MATHEMATICAL MODEL (4)
OPTICAL SENSORS (4)
PROBABILISTIC LOGIC (4)
PROBABILISTIC SHAPING (4)
RESOURCE ALLOCATION (4)
BACKPROPAGATION (3)
BINARY REFLECTED GRAY CODE (3)
CHANNEL MODELS (3)
COGNITIVE RADIO (3)
CONVOLUTIONAL CODES (3)
FIBER-OPTIC COMMUNICATIONS (3)
FIBER-OPTICAL COMMUNICATIONS (3)
FREQUENCY MODULATION (3)
GENERALIZED MUTUAL INFORMATION (3)
HIDDEN MARKOV MODELS (3)
INTERLEAVED CODES (3)
OPTICAL DISTORTION (3)
OPTICAL SWITCHES (3)
SIGNAL PROCESSING ALGORITHMS (3)
TRANSFORMS (3)
VERTICAL CAVITY SURFACE EMITTING LASERS (3)
WIDEBAND (3)
4-PAM (2)
ADDITIVE WHITE GAUSSIAN NOISE CHANNEL (2)
APPROXIMATION ALGORITHMS (2)
BENCHMARK TESTING (2)
CHROMATIC DISPERSION (2)
COHERENT DETECTION (2)
CONFERENCES (2)
CROSSTALK (2)
CRYPTOGRAPHY (2)
DATA COMMUNICATIONS (2)
DIGITAL BACKPROPAGATION (2)
DIRECT DETECTION (2)
DSA (2)
ELASTIC OPTICAL NETWORKS (2)
ENTROPY (2)
ERBIUM-DOPED FIBER AMPLIFIERS (2)
FACTOR GRAPHS (2)
FADING (2)
FIBER NONLINEAR OPTICS (2)
GRAY CODE (2)
HADAMARD TRANSFORM (2)
HAMMING WEIGHT (2)
HARD-DECISION DECODING (2)
HIDDEN MARKOV MODEL (2)
IM/DD (2)
INTENSITY MODULATION (2)
INTERFERENCE (2)
INTERFERENCE RATIO (2)
IP NETWORKS (2)
LASER NOISE (2)
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INFONA - science communication portal

Search results for: Erik Agrell

The Optimal Lattice Quantizer in Nine Dimensions

Performance Metrics for Systems With Soft-Decision FEC and Probabilistic Shaping

Scalability analysis methodology for passive optical interconnects in data center networks using PAM

Capacity scaling of flexible optical networks with nonlinear impairment

PAM Performance Analysis in Multicast-Enabled Wavelength-Routing Data Centers

A novel demodulation scheme for a memoryless optical interference channel

Modified digital backpropagation accounting for polarization-mode dispersion

Achievable rates of multidimensional multisphere distributions

Temporal stochastic channel model for absolute polarization state and polarization-mode dispersion

An impairment-aware resource allocation scheme for dynamic elastic optical networks

Phase-noise compensation for spatial-division multiplexed transmission

Network performance trade-off in optical spatial division multiplexing data centers

Joint Assignment of Power, Routing, and Spectrum in Static Flexible-Grid Networks

High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers

Multidimensional Modulation and Coding in Optical Transport

Information Rates of Next-Generation Long-Haul Optical Fiber Systems Using Coded Modulation

Optical circuit granularity impact in TCP-dominant hybrid data center networks

Multicast scheduling for optical data center switches with tunability constraints

Achievable information rates of nonbinary codes for optical fiber transmission

Joint-Polarization Phase-Noise Estimation and Symbol Detection for Optical Coherent Receivers

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