Equalization Techniques for Mitigating Transmission Impairments

Win, Moe Z.; Winters, J.H.; Vitetta, G.M.

doi:10.1016/b978-012395173-1/50018-9

Cited by 8 publications

(2 citation statements)

References 68 publications

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“…For example, ISI can arise from band-limited transmitters, narrow-band optical filtering, chromatic dispersion, or polarization mode dispersion. Equalizers operating in the electrical domain to mitigate ISI impairments in digital optical communication systems are well known and demonstrated [81]. It is generally accepted that an optical equalizer, used before the photo-detector, can generally outperform an electrical equalizer since the electrical equalizer is used after the photo-detector, in which the optical phase information is lost.…”

Section: Equalizationmentioning

confidence: 99%

Optical technologies and techniques for high bit rate fiber transmission

Liu¹,

Gill²,

Chandrasekhar³

2006

Bell Labs Tech. J.

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reduces the operational expenditure (OpEx) of such networks. Thirdly, high spectral efficiency (SE) can be achieved in a WDM system that has a common channel grid through the use of high bit rate channels. Improving spectral utilization facilitates increased overall system capacity and lower overall cost.In this paper, we review the advances in selected optical technologies and techniques for high bit rate fiber transmission. We describe optical terminal technologies and techniques for high bit rate transmission, including optical modulation formats and their corresponding transmitter and receiver designs. A comparison among different modulation formats, having amplitude and/or phase modulation, will be given. Also discussed are optical and electronic equalization techniques at the optical terminals, and forward error correction (FEC). We next review advances in optical repeaters, including optical amplifiers and dispersion compensators. Broadband Raman amplification and nonlinearity management will also be discussed. We follow by examining link design issues such as the

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Section: Equalizationmentioning

confidence: 99%

Optical technologies and techniques for high bit rate fiber transmission

Liu¹,

Gill²,

Chandrasekhar³

2006

Bell Labs Tech. J.

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“…Since then, a number of studies were undertaken to explore a variety of equalizer structures for adaptive optical-channel impairment compensation ranging from feedforward-type equalizers to maximum-likelihood estimators [6,7,8,9,10,11]. Among many studies in electronic PMD compensation in recent years, [12,13,14,15,16,17,18,19], the first decision-feedback loop and tapped-delay-line equalizer at 10 Gbps were implemented in [20] and [21] respectively. The maximum-likelihood estimation for PMD compensation was also investigated in [22,23].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Electronic Dispersion Compensator for Chromatic and Polarization-Mode Dispersions in Optical Communication Systems

Koc¹

2005

EURASIP J. Adv. Signal Process.

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The widely-used LMS algorithm for coefficient updates in adaptive (feedforward/decision-feedback) equalizers is found to be suboptimal for ASE-dominant systems but various coefficient-dithering approaches suffer from slow adaptation rate without guarantee of convergence. In view of the non-Gaussian nature of optical noise after the square-law optoelectronic conversion, we propose to apply the higher-order least-mean 2Nth-order (LMN) algorithms resulting in OSNR penalty which is 1.5Ã¢Â€Â“2 dB less than that of LMS. Furthermore, combined with adjustable slicer threshold control, the proposed equalizer structures are demonstrated through extensive Monte Carlo simulations to achieve better performance

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