DSP for Coherent Single-Carrier Receivers

Abstract

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.

Anatomy of a Digital Coherent Receiver

“…Diverse variants of this procedure, each using a different metric, have been shown so far. A criterion derived from constant modulus algorithm (CMA) is used in [10], [11], delay-tap sampling estimator [12], [13], autocorrelation of signal power waveform [14], [15], clock tone search [16]- [18], Gardner time error detector variance [19]. Recently, another technique has been demonstrated, where the sweep over CD values is performed automatically when applying FFT on the autocorrelation of discrete spectrum [20].…”

Advanced Modulation Formats and MLSE Based Digital Signal Processing for 100Gbit/sec Communication Through Optical Fibers

“…The proposed PPU is similar to those presented in (Ip & Kahn, 2007;Fludger et al 2008;Kuschnerov et al, 2009). The important differences are: (a) the incoming signal bandwidth is intentionally reduced by the AAFs to comply with the Nyquist sampling theorem, (b) sampling and DSP are being done at symbol rate, and (c) the AAF-related introduced ISI is compensated by post processing MLSE.…”

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

“…2) Frequency Domain Equalization: Equalization can be performed in the frequency domain (FD) [21], [45], [46], as shown in Fig. 4.…”