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Photonics 2017, 4(1), 13; doi:10.3390/photonics4010013

High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers

University of Peloponnese, Department of Informatics and Telecommunications, Tripolis, Terma Karaiskaki 22100, Greece
Author to whom correspondence should be addressed.
Received: 15 January 2017 / Revised: 23 February 2017 / Accepted: 24 February 2017 / Published: 26 February 2017
(This article belongs to the Special Issue Optical Networks for Communications)
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Optical transmission technologies optimized for optical network segments sensitive to power consumption and cost, comprise modulation formats with direct detection technologies. Specifically, non-return to zero differential quaternary phase shift keying (NRZ-DQPSK) in deployed fiber plants, combined with high-performance, low-complexity electronic equalizers to compensate residual impairments at the receiver end, can be proved as a viable solution for high-performance, high-capacity optical links. Joint processing of the constructive and the destructive signals at the single-ended DQPSK receiver provides improved performance compared to the balanced configuration, however, at the expense of higher hardware requirements, a fact that may not be neglected especially in the case of high-speed optical links. To overcome this bottleneck, the use of partially joint constructive/destructive DQPSK equalization is investigated in this paper. Symbol-by-symbol equalization is performed by means of Volterra decision feedback-type equalizers, driven by a reduced subset of signals selected from the constructive and the destructive ports of the optical detectors. The proposed approach offers a low-complexity alternative for electronic equalization, without sacrificing much of the performance compared to the fully-deployed counterpart. The efficiency of the proposed equalizers is demonstrated by means of computer simulation in a typical optical transmission scenario. View Full-Text
Keywords: advanced optical transmission techniques; digital signal processing; electronic equalization; dispersion compensation advanced optical transmission techniques; digital signal processing; electronic equalization; dispersion compensation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nanou, M.; Politi, C.T.; Stavdas, A.; Georgoulakis, K.; Glentis, G.-O. High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers. Photonics 2017, 4, 13.

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