Partial-Response Signaling

Kabal, P.; Pasupathy, S.

doi:10.1109/tcom.1975.1092918

Cited by 398 publications

(135 citation statements)

References 7 publications

(4 reference statements)

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“…3 are (28) where and is the unknown phase shift between the delayed and undelayed optical carrier at the input of the optical hybrid. Assuming that the detectors bandwidth is much larger than the laser linewidth and thermal noise dominant over shot noise, the photodetected signals are (29) (30) where and are two independent zero-mean white (over the detector bandwidth) Gaussian processes with twosided PSD , all the parameters being defined in Section IV. By substituting (10) and (28) in (29) and (30), we finally obtain the normalized complex signal in (11).…”

Section: Appendixmentioning

confidence: 99%

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Colavolpe

Foggi²,

Forestieri

et al. 2011

J. Lightwave Technol.

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Abstract-One of the most severe impairments that affect coherent optical systems employing high-order modulation formats is phase noise due to transmit and receive lasers. This is especially detrimental in uncompensated links, where an ideal compensator for channel distortions and laser phase noise should first eliminate receive phase noise, then equalize channel distortions, and only later compensate for transmit phase noise. Unfortunately, the simultaneous presence of transmit and receive phase noise makes very difficult to discriminate between them, even in the presence of a pilot tone. Moreover, the picture is different for optical systems using single-carrier or orthogonal frequency division multiplexing, where transmit and receive phase noise components may have a different impact. All these aspects are analyzed and discussed in this paper. A novel digital coherence enhancement (DCE) technique, able to significantly reduce the phase noise of transmit or receive lasers by using an interferometric device plus a very simple electronic processing, is also described. The performance of this technique and the statistical properties of the residual phase noise are analytically derived and verified by simulations, showing a high increase of the maximum bit-rate-distance product. The practical implementation of DCE is finally discussed and some alternative implementation schemes are presented.Index Terms-Coherent detection, group velocity dispersion (GVD), optical communication, orthogonal frequency division multiplexing (OFDM), phase noise.

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Section: Appendixmentioning

confidence: 99%

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Colavolpe

Foggi²,

Forestieri

et al. 2011

J. Lightwave Technol.

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show abstract

“…Three principal areas relating to advances in systems due to signal-processing can be identified, (i) Improvements in channel qualities: This includes equalisation methods such as partial response, adaptive filters, decision feedback techniques [3][4][5].…”

Section: The Importance Of Signal Processingmentioning

confidence: 99%

Signal Processing for Present and Future Magnetic Recording Systems

et al. 1997

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Abstract-A background of activity is presented for signal processing as applied to, and used in, magnetic information storage systems. Specific examples are given of how current and previous research projects fit into the overall progress of research in this area. Arguments are presented as to why, in the distant future, information will be stored as "analogue" information rather than binary so methods and techniques will need to be developed to utilize the near-infinite capacity of such systems.

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“…The use of electrical duobinary signaling [5] for high-speed backplane transmission to accomplish the two tasks of bandwidth reduction and simplification of implementation relative to other approaches was proposed for the first time in [6]. Duobinary takes advantage of the inherent rolloff of the backplane channel, which results in an architecture that is very simple to build.…”

Section: Introductionmentioning

confidence: 99%

High-speed electrical backplane transmission using duobinary signaling

Sinsky¹,

Duelk²,

Adamiecki³

2005

IEEE Trans. Microwave Theory Techn.

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Abstract-High-speed electrical data transmission through lowcost backplanes is a particularly challenging problem. We present for the first time a very effective approach that uses the concept of duobinary signaling to accomplish this task. Using a finite-impulseresponse filter, we are able to compensate for the phase and amplitude response of the backplane such that the resulting frequency response of the channel is that of an ideal duobinary filter. At the output of the backplane, we use an innovative pseudodigital circuit to convert the electrical duobinary to binary. For 10-Gb/s data transmission, we demonstrate a bit error rate 10 13 through electrical backplane traces up to 34 in in length on FR4. A full discussion of the concept, system architecture, and measured results are presented. Analysis is presented that compares and contrasts this approach to PAM-4 and standard nonreturn-to-zero signaling.

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Partial-Response Signaling

Cited by 398 publications

References 7 publications

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Signal Processing for Present and Future Magnetic Recording Systems

High-speed electrical backplane transmission using duobinary signaling

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