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Low-complexity linewidth-tolerant time domain sub-symbol optical phase noise suppression in CO-OFDM systems
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. S China Normal Univ, China.
2016 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 24, no 5, 4856-4871 p.Article in journal (Refereed) PublishedText
Abstract [en]

Two linewidth-tolerant optical phase noise suppression algorithms, non-decision aided sub-symbol optical phase noise suppression (NDA-SPS) and partial-decision aided sub-symbol optical phase noise suppression (PDA-SPS), based on low-complexity time domain sub-symbol processing are proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. High accuracy carrier phase estimation is achieved in the NDA-SPS algorithm without decision error propagation. Compared with NDA-SPS, partial-decision aided estimation is introduced in PDA-SPS to reduce the pilot-overhead by half, yet only a small performance degradation is induced. The principles and computational complexities of the proposed algorithms are theoretically analyzed. By adopting specially designed comb-type pilot subcarriers, multiplier-free observation-based matrix generation is realized in the proposed algorithms. Computationally intensive discrete Fourier transform (DFT) or inverse DFT (IDFT) operations, which are usually carried out in other high-performance inter-carrier-interference (ICI) mitigation algorithms multiple times, are completely avoided. Compared with several other sub-symbol algorithms, the proposed algorithms with lower complexities offer considerably larger laser linewidth tolerances as demonstrated by Monte-Carlo simulations. Numerical analysis verifies that the optimal performance of PDA-SPS can be achieved with moderate numbers of sub-symbols.

Place, publisher, year, edition, pages
2016. Vol. 24, no 5, 4856-4871 p.
National Category
Signal Processing
URN: urn:nbn:se:kth:diva-184529DOI: 10.1364/OE.24.004856ISI: 000371435000051ScopusID: 2-s2.0-84962203752OAI: diva2:917423

QC 20160406

Available from: 2016-04-06 Created: 2016-04-01 Last updated: 2016-04-06Bibliographically approved

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He, Sailing
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