Electronic Channel Equalization Techniques

Papagiannakis, I.; Bosco, Gabriella; Fonseca, Daniel; Klonidis, Dimitrios; Poggiolini, Pierluigi; Rosenkranz, Werner; Teixeira, A.; Tomkos, Ioannis; Xia, Chunmin

doi:10.1007/978-3-642-01524-3_3

Cited by 7 publications

(7 citation statements)

References 25 publications

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“…Electronic equalization is used to mitigate either the residual Chromatic Dispersion (CD) resulting from the incomplete optical compensation or the accumulated CD resulting from uncompensated optical transmission [1]- [3]. Thus, communication systems based on the Intensity Modulation/Direct Detection (IM/DD) scheme, where the optical to electrical conversion is done via a photo-detector (acts as a square-law function), have been used extensively for 10 Gb/s up to 40 Gb/s optical links [1], [2].…”

Section: Introductionmentioning

confidence: 99%

High-performance FPGA implementations of volterra DFEs for optical fiber systems

Emeretlis

Theodoridis

Glentis

2014

2014 International Conference on ReConFigurable Computing and FPGAs (ReConFig14)

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Low-complexity Volterra Decision Feedback Equalizers (VDFEs) for optical fiber links are proposed. By properly discarding large blocks of coefficients in the feedforward and feedback sections of the equalizer, a significant complexity reduction is achieved without affecting its efficiency. Moreover, suitable architectures and high-performance FPGA implementations are provided. It is demonstrated that the efficiency of the proposed VDFEs in terms of BER is similar to the counterpart full-size VDFEs for links of the same length, while, they demand 50% less arithmetic resources. Also, the proposed DFEs meet the desired 10 Gb/s rate and in certain cases achieve rates of 17 Gb/s and 25 Gb/s.

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Section: Introductionmentioning

confidence: 99%

High-performance FPGA implementations of volterra DFEs for optical fiber systems

Emeretlis

Theodoridis

Glentis

2014

2014 International Conference on ReConFigurable Computing and FPGAs (ReConFig14)

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“…Thus, optical communication systems based on the Intensity Modulation/Direct Detection (IM/DD) have been used extensively for optical links. Although coherent optical systems achieve higher transmission rates, direct detection offers low-cost and simple receiver design, since the optical to electrical conversion is realized via a photo-detector, [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Efficient FPGA implementations of volterra DFES for optical systems

Emeretlis

Kelefouras

Theodoridis

et al. 2014

2014 IEEE Dallas Circuits and Systems Conference (DCAS)

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In this work suitable architectures and highthroughput FPGA implementations of Volterra DecisionFeedback Equalizers (VDFEs) for optical communication links are presented. Two VDFE configurations were selected based on the available resources of the employed FPGA devices, and two multiplexer-based architectures were developed for each of them in order to achieve the target throughput. The comparison of the experimental results with respect to different VDFE configurations, throughput, and FPGA devices points out the platform-specific design characteristics. The introduced architectures meet the desired 10Gb/s throughput, so it is demonstrated that the FPGA is a suitable platform for highspeed optical fiber communication systems.

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“…Predistortion/equalization belong to a class of electronic techniques to compensate for the physical impairments in fiber-optic communication channel [82]. This is often accomplished by applying an inverse transfer function to the signal.…”

Section: Predistortion/equalizationmentioning

confidence: 99%

“…Electronic equalizers can be classified into four categories: feed-forward equalizer (FFE), decision-feedback equalizer (DFE), maximum likelihood sequence estimation (MLSE) equalizer [82], and backpropagation.…”

Section: Predistortion/equalizationmentioning

confidence: 99%

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Model-Centric Approach to Discrete-Time Signal Processing for Dense Wavelength-Division Multiplexing Systems

Song¹

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Dense wavelength-division multiplexing (DWDM) is the solution of choice for high-capacity optical backbone networks. However, in long-haul DWDM systems with periodic dispersion compensation and amplification, all optical communications give rise to severe physical impairments, due to fiber dispersion and nonlinearity, together with noise due to amplified spontaneous emission (ASE), that adversely degrade system performance. To mitigate these physical impairments and exploit system capacity of long-haul DWDM systems, a mathematical model that describes the input-output relationship of these systems and characterizes various physical impairments is required to serve as the foundation of discretetime signal processing for fiber-optic communication systems. This dissertation develops a model-centric approach for discrete-time signal processing for long-haul DWDM systems and addresses the development, validation and applications of a 2D discrete-time model of physical impairments in long-haul DWDM systems with periodic dispersion compensation and amplification. The model development is based on the third-order Volterra series transfer function (VSTF) method. The model overcomes the well-known triple integral problem inherent in the original VSTF method and simplifies it to a simple integral that is easy to evaluate. The model takes into account multichannel effects, fiber losses, frequency chirp, optical filtering, and photodetection, which are ignored in the current literature. The model is in discrete-time and facilitates its applications in discrete-time signal processing to improve the system performance of long-haul DWDM systems. The model characterizes each individual i Abstract ii physical impairment by introducing the corresponding impairment coefficient. The model offers obvious advantages over the third-order VSTF method and the split-step Fourier (SSF) method. The model is in excellent agreement with results obtained from the SSF method. The 2D discrete-time model is applied in system analysis and system performance improvement of long-haul DWDM systems. In system analysis, two applications are developed. Using the 2D discrete-time model, the effects of varying system parameters (symbol rate and channel spacing) and pulse shape on individual physical impairments in long-haul DWDM systems are analyzed. The concept of range of influence (RoI) of physical impairments is proposed and the RoI of each individual physical impairment is determined to guide the development of discrete-time signal processing. In system performance improvement, two applications are developed. Using the 2D discrete-time model, a novel constrained code based on the Total Impairment Extent Rank (TIER) is proposed to mitigate nonlinear physical impairments in long-haul fiber-optic communication systems; a TIER-LDPC concatenation scheme is proposed to combine the strength of the TIER code in effectively suppressing severe nonlinear physical impairments and that of the LDPC code in correcting memoryless errors due to ASE noise. A nonlinear ...

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Electronic Channel Equalization Techniques

Cited by 7 publications

References 25 publications

High-performance FPGA implementations of volterra DFEs for optical fiber systems

High-performance FPGA implementations of volterra DFEs for optical fiber systems

Efficient FPGA implementations of volterra DFES for optical systems

Model-Centric Approach to Discrete-Time Signal Processing for Dense Wavelength-Division Multiplexing Systems

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