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
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Photonics 2017, 4(1), 13; https://doi.org/10.3390/photonics4010013
Received: 15 January 2017
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Revised: 23 February 2017
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Accepted: 24 February 2017
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Published: 26 February 2017
(This article belongs to the Special Issue Optical Networks for Communications)
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.
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Keywords:
advanced optical transmission techniques; digital signal processing; electronic equalization; dispersion compensation
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MDPI and ACS Style
Nanou, M.; Politi, C.; Stavdas, A.; Georgoulakis, K.; Glentis, G.-O. High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers. Photonics 2017, 4, 13. https://doi.org/10.3390/photonics4010013
AMA Style
Nanou M, Politi C, Stavdas A, Georgoulakis K, Glentis G-O. High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers. Photonics. 2017; 4(1):13. https://doi.org/10.3390/photonics4010013
Chicago/Turabian StyleNanou, Maki, Christina Politi, Alexandros Stavdas, Kristina Georgoulakis, and George-Othon Glentis. 2017. "High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers" Photonics 4, no. 1: 13. https://doi.org/10.3390/photonics4010013
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