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- Karlsson, Magnus, 1967, et al.
(författare)
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Multidimensional Optimized Optical Modulation Formats
- 2016
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Ingår i: Enabling Technologies for High Spectral-efficiency Coherent Optical Communication Networks, Ch. 2. - : Wiley. - 9781118714768 ; , s. 13-64
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter overviews the relatively large body of work (experimental and theoretical) on modulation formats for optical coherent links. It first gives basic definitions and performance metrics for modulation formats that are common in the literature. Then, the chapter discusses optimization of modulation formats in coded systems. It distinguishes between three cases, depending on the type of decoder employed, which pose quite different requirements on the choice of modulation format. The three cases are soft-decision decoding, hard-decision decoding, and iterative decoding, which loosely correspond to weak, medium, and strong coding, respectively. The chapter also discusses the realizations of the transmitter and transmission link properties and the receiver algorithms, including DSP and decoding. It further explains how to simply determine the transmitted symbol from the received 4D vector, without resorting to a full search of the Euclidean distances to all points in the whole constellation.
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- Karlsson, Magnus, 1967, et al.
(författare)
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Soliton Stability in PMD Perturbed Transmission Systems
- 1998
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Ingår i: New Trends in Optical Soliton Transmission Systems. - Dordrecht : Springer Netherlands. - 9789401151412 ; , s. 25-37
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents a detailed investigation of how solitons broaden in the presence of polarization-mode dispersion (PMD). For a given degree of PMD and pulse width there exists an optimum choice of group-velocity dispersion, for which solitons are most resistant to the effects of PMD. We also optimize the soliton power enhancement factor and find that solitons can propagate roughly twice the distance compared to linear pulses in the absence of group-velocity dispersion. Finally we investigate the PMD robustness of dispersion managed solitons, and in the case simulated we find no quantitative difference as compared to conventional solitons.
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- Karlsson, Magnus, 1967, et al.
(författare)
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Solitons: Soliton Communication Systems
- 2004
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Ingår i: Encyclopedia of Modern Optics, Five-Volume Set. - 9780123693952 ; , s. 65-72
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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