Performance evaluation of decision feedback equalizers in fiber communication links

Kelefouras

2014 IEEE Dallas Circuits and Systems Conference (DCAS)

et al. 2014

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.

Section: Resultsmentioning

confidence: 99%

“…However, in IM/DD systems, the conventional DFE, consisting of linear filters, is not able to efficiently mitigate the ISI, because the CD has a nonlinear effect. In order to face the nonlinearities, the use of second order Volterra filters as FFF and FBF has been proposed [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Efficient FPGA implementations of volterra DFES for optical systems

Kelefouras

2014 IEEE Dallas Circuits and Systems Conference (DCAS)

et al. 2014

“…Channel equalizers are used at the receiver part to suppress the Intersymbol Interference (ISI), which is the result of the overlapping between the current symbol with previous and subsequent ones [4]- [10]. To achieve this, Decision Feedback Equalizers (DFEs) are widely used [11].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the non-linear nature of the optical receiver, the efficiency of the conventional DFE, which consists of linear FIR filters, is not sufficient [10]. Thus, DFEs based on recursive Volterra filters (Volterra DFEs -VDFEs) have been proposed [4], [5], [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2014 International Conference on ReConFigurable Computing and FPGAs (ReConFig14)

Glentis

2014

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.

FPGA implementation of a MIMO DFE IN 40 GB/S DQPSK optical links

Kefelouras

2015 23rd European Signal Processing Conference (EUSIPCO)

et al. 2015

Self Cite

In this paper, an FPGA implementation of a Multi Input Multi Output (MIMO) Decision Feedback equalizer (DFE) is proposed, for the electronic compensation of the impairments in 40Gb/s Intensity Modulated Direct Detection (IM/DD) optical communication links employing NRZ DQPSK signaling. The proposed equalizer is used for the electronic compensation the residual Chromatic Dispersion (CD) along the installed optically compensated optical paths. The required processing rate is achieved by applying intensive pipelining and parallelism in the original architecture of the equalizer. At the given processing rate, a 8-input 2-output DFE involving three taps feedforward filtering and two taps backward filtering is implemented on a single, cutting edge technology, Xilinx FPGA device.