On the performance of electrical equalization in optical fiber transmission systems

Weiss, A.J.

doi:10.1109/lpt.2003.816120

Cited by 59 publications

(13 citation statements)

References 12 publications

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“…In this paper, we consider the optimal MLSD strategy with PMD and GVD in the sense that our aim is to describe the receiver structure and to provide a reliable method for computing the relevant performance for any possible value of the system parameters, under the only constraint of one sample per bit, as in [15] and [16], or no constraint on the sampling rate, since oversampling is a possible way to guarantee sufficient statistics for this transmission system [17] (see also [18] for applications to optical channels). In particular, through numerical evaluation [19], we derived a practically exact expression of the received signal statistics in the case of a receiver working with one sample per bit time so that a lookup-table-based MLSD receiver could be implemented [20].…”

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confidence: 99%

Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

Foggi

Forestieri

Colavolpe

et al. 2006

J. Lightwave Technol.

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Abstract-This paper thoroughly investigates the maximumlikelihood sequence detection (MLSD) receiver for the optical ON-OFF keying (OOK) channel in the presence of both polarization mode dispersion and group velocity dispersion (GVD). A reliable method is provided for computing the relevant performance for any possible value of the system parameters, with no constraint on the sampling rate. With one sample per bit time, a practically exact expression of the statistics of the received samples is found, and therefore the performance of a synchronous MLSD receiver is evaluated and compared with that of other electronic techniques such as combined feedforward and decision-feedback equalizers (FFE and DFE). It is also shown that the ultimate performance of electronic processing can be obtained by sampling the received signal at twice the bit rate. An approximate accurate closed-form expression of the receiver metrics is also identified, allowing for the implementation of a practically optimal MLSD receiver.Index Terms-Chromatic dispersion, electrical equalization, intersymbol interference (ISI), maximum-likelihood sequence detection (MLSD), optical transmission systems, polarization mode dispersion (PMD).

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confidence: 99%

Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

Foggi

Forestieri

Colavolpe

et al. 2006

J. Lightwave Technol.

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“…Using the state-input representation, the statistical properties of a sample can be given by the pdf (6) To simplify notation, sometimes instead of is used. The SNR is defined as (7) where equally likely transmit symbols are assumed. is the energy per bit, is the symbol energy, is the total noise spectral density, and is the impulse shaper duty cycle according to [20].…”

Section: System Modelmentioning

confidence: 99%

Performance Bounds of Optical Receivers With Electronic Detection and Decoding

Rankl

Speidel

2009

J. Lightwave Technol.

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Abstract-In this paper, we investigate lower bounds of optical-signal-to-noise ratio (OSNR) for three types of electronic digital-signal-processing (DSP) receivers, which are used for an intensity-modulated and direct-photo-detected optical transmission link. Target is to determine the performance bound of this transmission link if equalization and/or forward error correction (FEC) are used. The investigated DSP methods are hard-input FEC decoding, soft-input FEC decoding, and sequence detection. The impact of chromatic and polarization mode dispersion, as well as the effect of code rate on the bounds, is shown. Signal statistics are computed analytically. Several implementations of coding and detection schemes, such as Reed-Solomon (RS) and low-density parity-check (LDPC) decoding as well as Turbo equalization, are investigated, and we show the distance of their performances to the derived bounds in quite some detail.

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“…As the transmission rate increases, ISI mitigation becomes indispensable and many schemes for CD and PMD compensation have been proposed. These compensation techniques can be separated into two approaches; optical domain equalization [3] and electrical domain equalization [2,4,5]. Optical equalization schemes can achieve perfect compensation using inverse system response, while the performance of electrical domain equalization is limited due to the nonlinear channel effect caused by the photodetector, which is a square-law detector.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, most work on electronic domain equalizers has been focused on experimental studies [2,5,6]. The equalizer coefficients are determined by adaptive algorithms such as least mean square (LMS) algorithms and recursive least square (RLS) algorithms [7].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Electrical MMSE Linear Equalizers in Optically Amplified OOK Systems

Park

Chung

2011

Journal of the Optical Society of Korea

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We analyze the linear equalizers used in optically amplified on-off-keyed (OOK) systems to combat chromatic dispersion (CD) and polarization mode dispersion (PMD), and we derive the mathematical minimum mean squared error (MMSE) performance of these equalizers. Currently, the MMSE linear equalizer for optical OOK systems is obtained by simulations using adaptive approaches such as least mean squared (LMS) or constant modulus algorithm (CMA), but no theoretical studies on the optimal solutions for these equalizers have been performed. We model the optical OOK systems as square-law nonlinear channels and compute the MMSE equalizer coefficients directly from the estimated optical channel, signal power, and optical noise variance. The accuracy of the calculated MMSE equalizer coefficients and MMSE performance has been verified by simulations using adaptive algorithms.

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On the performance of electrical equalization in optical fiber transmission systems

Cited by 59 publications

References 12 publications

Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

Maximum-likelihood sequence detection with closed-form metrics in OOK optical systems impaired by GVD and PMD

Performance Bounds of Optical Receivers With Electronic Detection and Decoding

Performance Analysis of Electrical MMSE Linear Equalizers in Optically Amplified OOK Systems

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