Frequency-Domain Chromatic Dispersion Equalization Using Overlap-Add Methods in Coherent Optical System

Xu, Tianhua; Jacobsen, Gunnar; Popov, Sergei; Forzati, Marco; Mårtensson, Jonas; Mussolin, Marco; Li, Jie; Wang, Ke; Zhang, Yimo; Friberg, Ari T.

doi:10.1515/joc.2011.022

Cited by 25 publications

(18 citation statements)

References 10 publications

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“…Therefore, a comprehensive comparison with the benchmark FD-CDE is mandatory to assess the merits of the proposed D-FIR-CDE algorithm. Firstly, it should be noted that for each value of N there is an optimal value of N FFT that provides the highest computational efficiency (lowest complexity per processed sample) for FD-CDE [10]. However, considering a fully parallel FFT implementation, it should be noted that the total number of hardware resources (instead of the number of operations per equalized sample) becomes the primary computational effort indicator, since it ultimately dictates the chip area.…”

Section: B Computational Effort and Latencymentioning

confidence: 99%

Distributive FIR-Based Chromatic Dispersion Equalization for Coherent Receivers

Martins

Guiomar

Amado

et al. 2016

J. Lightwave Technol.

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We propose a novel and efficient multiplierless finite-impulse response (FIR)-based filter architecture for chromatic dispersion equalization (CDE) in coherent optical communication systems. After quantizing the FIR coefficients, we take advantage of the high multiplicity of their real and imaginary parts, employing the distributive property of multiplication over addition to sharply reduce the number of multiplication operations, obtaining the distributive FIR-CDE (D-FIR-CDE). Furthermore, the implementation of multiplication operations with shifts and additions allows to obtain a multiplierless D-FIR-CDE (MD-FIR-CDE). The proposed equalizers are experimentally validated in a 100G polarization-multiplexed (PM)-QPSK long-haul optical link and compared against benchmark FIR-CDE and frequency-domain (FD)-CDE implementations. We demonstrate computational resources savings of over 99% in number of multiplication operations and 40% in number of additions, relatively to the FIR-CDE implementation. In addition, the D-FIR-CDE is also shown to compare favorably relatively to the most widely used FD-CDE, achieving significant gains both in terms of required chip area and latency: more than 99% and 30% fewer multipliers and additions, respectively, and a latency reduction of over 90%. We have also experimentally demonstrated that the performance penalty imposed by the coefficient quantization tends to decrease with increasing propagation length, rendering it as an attractive solution for efficient and high-performance chromatic dispersion compensation in long-haul optical fiber links. Index Terms-Coherent detection, optical fiber communications, digital signal processing, chromatic dispersion, FIR. This work is funded by FCT/MEC through national funds and when applicable co-funded by FEDER-PT2020 partnership agreement under the project UID/EEA/50008/2013 (action SoftTransceiver), Ph.D. Grant PD/BD/113817/2015. Fernando P. Guiomar acknowledges the financial support provided by the European Commission through a Marie Skłodowska-Curie individual fellowship, project Flex-ON (653412).

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Section: B Computational Effort and Latencymentioning

confidence: 99%

Distributive FIR-Based Chromatic Dispersion Equalization for Coherent Receivers

Martins

Guiomar

Amado

et al. 2016

J. Lightwave Technol.

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“…The standard TD equalization is performed by a finite-impulse response (FIR) filter, whose tap coefficients can be determined from the inverse CD transfer function [1]. In FD the equalization exploits the computational efficiency of fast Fourier transform (FFT) in conjunction with overlap-save/add algorithms [3]. Aiming to reduce implementation the complexity, several optimized CDE algorithms have been proposed, including the use of sub-band processing [4] and coefficient quantization [5,6].…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Chromatic Dispersion Equalizer for 400G Transmission Systems

Martins¹,

Amado²,

Rossi³

et al. 2017

Optical Fiber Communication Conference

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“…In such a case, the filtering can be done more efficiently in frequency domain ( (log ) c N ) [32]. To implement frequency domain equalizer (FDE) either overlap-save method [33,34] or overlap-add method [35] has been investigated for CD compensation with former one having less complexity. The CD compensating FDE based on overlap-save method is illustrated in Fig.…”

Section: ) Frequency Domain Equalizermentioning

confidence: 99%

Digital Signal Processing for Coherent Transceivers Employing Multilevel Formats

Faruk

Savory

2017

J. Lightwave Technol.

213

115

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Digital coherent transceivers have revolutionized optical fiber communications due to their superior performance offered compared to intensity modulation and direct detection based alternatives. As systems employing digital coherent transceivers seek to approach their information theoretic capacity, the use of multilevel modulation formats combined with appropriate forward error correction becomes essential. Given this context, in this tutorial paper, we therefore explore the digital signal processing (DSP) utilized in a coherent transceiver with a focus on multilevel modulation formats. By way of an introduction, we open by discussing the photonic technology required to realize a coherent transceiver. After discussing this interface between the analog optical channel and the digital domain, the rest of the paper is focused on DSP. We begin by discussing algorithms that correct for imperfections in the optical to digital conversion, including IQ imbalance and timing skew. Next, we discuss channel equalization including means for their realization for both quasi-static and dynamic channel impairments. Synchronization algorithms that correct for the difference between the transmitter and receiver oscillators both optical and electrical are then discussed and issues associated with symbol decoding highlighted. For most of the cases, we start with polarization division multiplexed quadrature phase-shift keying (PDM-QPSK) format as a basis and then discuss the extension to allow for high order multilevel formats. Finally, we conclude by discussing some of the open research challenges in the field.

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Frequency-Domain Chromatic Dispersion Equalization Using Overlap-Add Methods in Coherent Optical System

Cited by 25 publications

References 10 publications

Distributive FIR-Based Chromatic Dispersion Equalization for Coherent Receivers

Distributive FIR-Based Chromatic Dispersion Equalization for Coherent Receivers

Low-Complexity Chromatic Dispersion Equalizer for 400G Transmission Systems

Digital Signal Processing for Coherent Transceivers Employing Multilevel Formats

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