Adaptive Chromatic Dispersion Equalization for Non-Dispersion Managed Coherent Systems

Kuschnerov, Maxim; Hauske, Fabian N.; Piyawanno, K.; Spinnler, Bernhard; Napoli, Antonio; Lankl, Berthold

doi:10.1364/ofc.2009.omt1

Cited by 46 publications

(45 citation statements)

References 3 publications

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“…The PMD and polarization rotation equalization could be realized by employing the adaptive LMS and constant modulus algorithm (CMA) equalizers [30,31]. The CD compensation is implemented by using a frequency domain equalizer (FDE) with appropriate parameters [32,33], which has been analyzed in our previous work [34].…”

Section: Simulation Investigation Of Pdm-qpsk Transmission Systemmentioning

confidence: 99%

Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise

Jacobsen

Popov

et al. 2013

Optics Communications

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. (2013) Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise. Optics Communications, 293. pp. 54-60. Permanent WRAP URL: http://wrap.warwick.ac.uk/93880 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. ABSTRACTWe present a comparative study on three carrier phase estimation algorithms, including a one-tap normalized least mean square (NLMS) method, a block-average method, and a Viterbi-Viterbi method in the n-level phase shift keying coherent transmission systems considering the equalization enhanced phase noise (EEPN). In these carrier phase estimation methods, the theoretical bit-error-rate floors based on traditional leading-order Taylor expansion are compared to the practical simulation results, and the tolerable total effective linewidths (involving the transmitter, the local oscillator lasers and the EEPN) for a fixed bit-error-rate floor are evaluated with different block size, when the fiber nonlinearities are neglected. The complexity of the three carrier phase estimation methods is also discussed. We find that the carrier phase estimation methods in practical systems should be analyzed based on the simulation results rather than the traditional theoretical predictions, when large EEPN is involved. The one-tap NLMS method can always show an acceptable behavior, while the step size is complicated to optimize. The block-average method is efficient to implement, but it behaves unsatisfactorily when using a large block size. The Viterbi-Viterbi method can show a small improvement compared to the block-average method, while it requires more computational complexity.

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Section: Simulation Investigation Of Pdm-qpsk Transmission Systemmentioning

confidence: 99%

Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise

Jacobsen

Popov

et al. 2013

Optics Communications

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“…In a situation with non-zero dispersion slope this is not the case, and adaptive LMS filtering after complex multiplication to remove the phase noise should be expected to give better BER performance than FDE (or FD-FIR) filtering. When it comes to the update of CD equalization filter weights in the situation with non-zero dispersion slope then this appears major modifications for the FD-FIR filter (see [7,8,21]) whereas it is straightforward to update the filter frequency response for the FDE filter [9,10,21]. For the LMS filter, this is a straightforward and automated part of the adaptive filter optimization.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Several discrete (digital) filters have been applied to compensate the chromatic dispersion in the time and frequency domain [4][5][6][7][8][9][10][11][12]. These include the maximum likelihood sequence estimation (MLSE) method [5], a time domain fiber dispersion finite impulse response (FD-FIR) filter [7,8,12], or a frequency domain equalizer (FDE) [9][10][11][12]. It is important to note that there is a complicated interplay between the discrete chromatic dispersion compensation and the laser phase noise.…”

Section: Introductionmentioning

confidence: 99%

EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

Jacobsen

Popov

et al. 2012

Opt. Express

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A radio frequency (RF) carrier can be used to mitigate the phase noise impact in n-level PSK and QAM systems. The systems performance is influenced by the use of an RF pilot carrier to accomplish phase noise compensation through complex multiplication in combination with discrete filters to compensate for the chromatic dispersion (CD). We perform a detailed study comparing two filters for the CD compensation namely the fixed frequency domain equalizer (FDE) filter and the adaptive least-mean-square (LMS) filter. The study provides important novel physical insight into the equalization enhanced phase noise (EEPN) influence on the system bit-error-rate (BER) versus optical signal-to-noise-ratio (OSNR) performance. Important results of the analysis are that the FDE filter position relative to the RF carrier phase noise compensation module provides a possibility for choosing whether the EEPN from the Tx or the LO laser influences the system quality. The LMS filter works very inefficiently when placed prior to the RF phase noise compensation stage of the Rx whereas it works much more efficiently and gives almost the same performance as the FDE filter when placed after the RF phase noise compensation stage.

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“…In the following, a blind estimation algorithm first introduced in [14] will be presented that restricts the equalizer solutions to the inverse of the dispersion transfer function from (2), thus stabilizing the equalizer convergence. The presented minimumsearch algorithm is nondata aided and works prior to the timing recovery.…”

Section: B Dispersion Estimationmentioning

confidence: 99%

DSP for Coherent Single-Carrier Receivers

Kuschnerov

Hauske

Piyawanno

et al. 2009

J. Lightwave Technol.

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265

116

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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-In this paper, we outline the design of signal processing (DSP) algorithms with blind estimation for 100-G coherent optical polarization-diversity receivers in single-carrier systems. As main degrading optical propagation effects, we considered chromatic dispersion (CD), polarization-mode dispersion (PMD), polarization-dependent loss (PDL), and cross-phase modulation (XPM). In the context of this work, we developed algorithms to increase the robustness of the single DSP receiver modules against the aforesaid propagation effects. In particular, we first present a new and fast algorithm to perform blind adaptive CD compensation through frequency-domain equalization. This low complexity equalizer component inherits a highly precise estimation of residual dispersion independent from previous or subsequent blocks. Next, we introduce an original dispersion-tolerant timing recovery and illustrate the derivation of blind polarization demultiplexing, capable to operate also in condition of high PDL. At last, we propose an XPM-mitigating carrier phase recovery as an extension of the standard Viterbi-Viterbi algorithm.

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Adaptive Chromatic Dispersion Equalization for Non-Dispersion Managed Coherent Systems

Cited by 46 publications

References 3 publications

Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise

Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise

EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

DSP for Coherent Single-Carrier Receivers

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