The Accuracy of the Analysis for non-Gaussian ASE Noise using the Gaussian Approximation - a Rigorous Approach

Xiao-pin, Zhang; Jacobsen, Gunnar

doi:10.1515/joc.1999.20.1.24

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…In long-haul amplified optical systems, the presence of a quadratic element (the photodetector) placed between the optical and the electric filters, leads to a strongly non-Gaussian noise at the output of the receiver [5], [6]. Several papers have been published on the modeling of optical systems.…”

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confidence: 99%

Soft decoding in optical systems

Bosco

Montorsi

Benedetto

2003

IEEE Trans. Commun.

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Abstract-We consider the application of concatenated codes with interleaver and iterative decoding to optical communication systems. We show how to obtain the optimum log-likelihood ratio to be provided to the soft decoder in the optical channel environment, and compare the performance of a decoder using it with the one employing a Gaussian approximation of the optical channel. Simulation results refer to practical turbo-product codes, and encompass the effect of quantization on the log-likelihood ratio. The results show that the Gaussian assumption in computing the log-likelihood ratio for the optical channel leads to significant losses.

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confidence: 99%

Soft decoding in optical systems

Bosco

Montorsi

Benedetto

2003

IEEE Trans. Commun.

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“…Brought to you by | Purdue University Libraries Authenticated Download Date | 5/29/15 5:54 AM filter [2] and for optical filters with very large bandwidths [9,11].…”

Section: Dependence Of the Pdf Shape On The Optical Filter Bandwidthmentioning

confidence: 99%

Analysis and Validation of the Probability Density Function of the Output Current of Optically Preamplified Receivers with Arbitrary Optical Filtering through Monte Carlo Simulation

Rebola¹,

Cartaxo²

2006

Journal of Optical Communications

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The validation of the probability density function (PDF) of the current at the decision circuit of an optically preamplified receiver with arbitrary optical filtering is assessed, for the first time, for tight optical filtering and considering the optical filter detuning. This assessment is performed through the analytical estimation of the PDF from the moment generating function (MGF) and by comparison with estimates using Monte Carlo simulation. An excellent agreement between PDFs is found.The influence of the optical filter shape, bandwidth and detuning on the PDF of the output current of an optically preamplified receiver with tight optical filtering is also investigated. All PDFs obtained are clearly non-Gaussian. For smaller signal powers, this non-Gaussian behavior is enhanced. The absence of a polarizer at the receiver and the narrowing of the optical filter bandwidth enhance even more this non-Gaussian behavior. The smoother cut-off of the optical filter amplitude response leads to a smaller PDF asymmetry (lower Gaussian behavior). For higher signal power, the PDF shape becomes more Gaussian and the dependence of its shape on the optical filter and on the presence/absence of a polarizer is lessened. It is also shown that the optical filter detuning influence on the non-Gaussian behavior of the PDF is very small.

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“…This situation leads to a highly non-Gaussian noise at the output of the receiver. This problem has been solved in the literature [1]- [4] under the assumption that ASE is a white Gaussian noise, where the real and imaginary noise components are uncorrelated, using a theory based on the Karhunen-Loève (KL) expansion. Moreover, analytical solutions only exist for a few combinations of optical and electrical filters, such as the single-stage Lorentzian optical filter and the integrate-and-dump electrical filter.…”

Section: Introductionmentioning

confidence: 99%

A novel analytical approach to the evaluation of the impact of fiber parametric gain on the bit error rate

Bosco

Carena

Curri

et al. 2001

IEEE Trans. Commun.

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We present in this paper a novel accurate method to analyze the performance of an optical link where the amplified spontaneous emission noise, enhanced by a fiber nonlinear phenomenon called parametric gain, is the limiting factor. Our method allows us to compute the exact error probability given a generic noise spectral density at the input of a direct detection optical receiver, using arbitrary optical and electrical filters. We compare our results with those predicted using the standard Gaussian technique (based on the factor), showing that this approximation may lead to significant errors. Our method is then used to evaluate the impact of parametric gain on a realistic long-haul multiwavelength link operating at 10 Gb/s, showing both the system limitation imposed by this phenomenon and the inaccuracy of the factor method.

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The Accuracy of the Analysis for non-Gaussian ASE Noise using the Gaussian Approximation - a Rigorous Approach

Cited by 6 publications

References 6 publications

Soft decoding in optical systems

Soft decoding in optical systems

Analysis and Validation of the Probability Density Function of the Output Current of Optically Preamplified Receivers with Arbitrary Optical Filtering through Monte Carlo Simulation

A novel analytical approach to the evaluation of the impact of fiber parametric gain on the bit error rate

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