Nonlinear Electrical Equalization for Different Modulation Formats With Optical Filtering

Xia, Chunmin; Rosenkranz, Werner

doi:10.1109/jlt.2007.891174

Cited by 79 publications

(34 citation statements)

References 15 publications

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“…The histogram method looks for the sequence that satisfies the following condition: (1) where is the current received sample, is the number of successive symbols to be estimated, and is the probability that the current received sample belongs to the state transition . The value of can be read from the histogram [18].…”

Section: A Histogram Methodsmentioning

confidence: 99%

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Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

Alfiad

Borne²,

Hauske³

et al. 2009

J. Lightwave Technol.

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Electronic chromatic dispersion compensation employing maximum-likelihood sequence estimation (MLSE) has recently been the topic of extensive research and a range of commercial products. It is well known that MLSE provides a considerable benefit for amplitude modulated modulation formats such as ON-OFF keying (OOK) and optical duobinary. However, when applied to optical phase modulation formats, such as differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK), it has been shown that the benefit is only marginal. This paper investigates joint-decision MLSE (JD-MLSE) detection applied to 10.7-Gb/s DPSK. It demonstrates that a JD-MLSE using the constructive and destructive components preserves the 3-dB optical signal-to-noise ratio (OSNR) advantage of DPSK over OOK in dispersion-limited optical systems. Furthermore, we demonstrate that the use of a shortened MZDI with MLSE for the 10.7-Gb/s DPSK modulation can equalize an accumulated chromatic dispersion of 4000 ps/nm. In addition, we discuss in this paper different MLSE schemes applied to 2 10.7-Gb/s DQPSK modulation. It is shown that a joint-symbol MLSE (JS-MLSE) on the balanced outputs of the in-phase and quadrature components gives the best performance.Index Terms-Differential phase-shift keying (DPSK), differential quadrature phase-shift keying (DQPSK), joint-decision MLSE (JD-MLSE), Mach-Zehnder delay interferometer (MZDI), maximum-likelihood sequence estimation (MLSE).

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Section: A Histogram Methodsmentioning

confidence: 99%

“…Among the various EDC techniques available, maximum-likelihood sequence estimation (MLSE) has showed itself as one of the more powerful [1]. MLSE provides excellent performance when combined with ON-OFF keying (OOK) [2]- [4] and duobinary modulation [5].…”

Section: E Lectronic Distortion Compensation (Edc)mentioning

confidence: 99%

Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

Alfiad

Borne²,

Hauske³

et al. 2009

J. Lightwave Technol.

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“…Although nonlinear Journal of Electrical and Computer Engineering DFE (NL-DFE) structures have also been considered in the literature (e.g., [8,9]), their performances still degrade significantly at long fiber lengths (e.g., ≥500 km). On the other hand, MLSD can operate with a constant penalty around 3 dB with respect to backto-back (B2B) at virtually any distance [10,11].…”

Section: Introductionmentioning

confidence: 99%

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Maggio

Hueda

Agazzi³

2015

Journal of Electrical and Computer Engineering

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The space-time whitened matched filter (ST-WMF) maximum likelihood sequence detection (MLSD) architecture has been recently proposed (Maggio et al., 2014). Its objective is reducing implementation complexity in transmissions over nonlinear dispersive channels. The ST-WMF-MLSD receiver (i) drastically reduces the number of states of the Viterbi decoder (VD) and (ii) offers a smooth trade-off between performance and complexity. In this work the ST-WMF-MLSD receiver is investigated in detail. We show that the space compression of the nonlinear channel is an instrumental property of the ST-WMF-MLSD which results in a major reduction of the implementation complexity in intensity modulation and direct detection (IM/DD) fiber optic systems. Moreover, we assess the performance of ST-WMF-MLSD in IM/DD optical systems with chromatic dispersion (CD) and polarization mode dispersion (PMD). Numerical results for a 10 Gb/s, 700 km, and IM/DD fiber-optic link with 50 ps differential group delay (DGD) show that the number of states of the VD in ST-WMF-MLSD can be reduced ∼4 times compared to an oversampled MLSD. Finally, we analyze the impact of the imperfect channel estimation on the performance of the ST-WMF-MLSD. Our results show that the performance degradation caused by channel estimation inaccuracies is low and similar to that achieved by existing MLSD schemes (∼0.2 dB).

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“…8,9 But they cannot fully compensate the distortions because the absolute square-law detection of the photodiode (PD) is the fundamental reason why the performance of conventional linear equalizer is degraded. A nonlinear equalizer is used to further enhance the system performance, such as a mathematical square root operator (SQRT), 10 nonlinear FFE-DFE (NL-FFE-DFE), 11 and maximum-likelihood sequence estimation (MLSE). 12,13 SQRT can linearize the receiver before equalization, but this cannot change the fact that the phase information introduced by dispersion is lost even after the square root operation.…”

Section: Introductionmentioning

confidence: 99%

Iterative intersymbol interference cancellation in vestigial sideband Nyquist–subcarrier modulation system

Liu

Chen

et al. 2014

Opt. Eng

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Abstract. The intersymbol interference caused by dispersion, chirp, and a vestigial sideband filter in intensity modulation and a direct detection single carrier system is analyzed theoretically and numerically. An iterative nonlinear intersymbol interference cancellation technique is proposed and experimentally demonstrated in a 40-Gbps 16-QAM Mach-Zehnder modulator-based vestigial sideband intensity modulation and direct detection halfcycle Nyquist-subcarrier modulation system over a 100-km uncompensated standard single-mode fiber transmission for the first time. The experimental results show that 2.2-dB receiver sensitivity improvement is obtained at the forward error correction limit by using the iterative technique.

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Nonlinear Electrical Equalization for Different Modulation Formats With Optical Filtering

Cited by 79 publications

References 15 publications

Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Iterative intersymbol interference cancellation in vestigial sideband Nyquist–subcarrier modulation system

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