| 1. |
- Eriksson, Tobias, 1986, et al.
(författare)
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Achievable Rates Comparison for Phase-Conjugated Twin-Waves and PM-QPSK
- 2016
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Ingår i: 21st OptoElectronics and Communications Conference, OECC 2016 - Held Jointly with 2016 International Conference on Photonics in Switching, PS 2016, Niigata, Japan, 3-7 July 2016. - 9784885523052 ; , s. TuB3-3
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Konferensbidrag (refereegranskat)abstract
- Phase-conjugated twin-waves (PCTW)-QPSK is experimentally compared to PM-QPSK in terms of achievable information rate for bit-wise decoders. For typical long-haul transmission distances, PM-QPSK with soft-decision FEC achieves significantly higher spectral efficiency than PCTW-QPSK.
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| 2. |
- Eriksson, Tobias, 1986, et al.
(författare)
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Impact of 4D Channel Distribution on the Achievable Rates in Coherent Optical Communication Experiments
- 2016
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 34:9, s. 2256-2266
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally investigate mutual information and generalized mutual information for coherent optical transmission systems. The impact of the assumed channel distribution on the achievable rate is investigated for distributions in up to four dimensions. Single channel and wavelength division multiplexing (WDM) transmission over transmission links with and without inline dispersion compensation are studied. We show that for conventional WDM systems without inline dispersion compensation, a circularly symmetric complex Gaussian distribution is a good approximation of the channel. For other channels, such as with inline dispersion compensation, this is no longer true and gains in the achievable information rate are obtained by considering more sophisticated four-dimensional (4D) distributions. We also show that for nonlinear channels, gains in the achievable information rate can also be achieved by estimating the mean values of the received constellation in four dimensions. The highest gain for such channels is seen for a 4D correlated Gaussian distribution.
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| 3. |
- Fehenberger, Tobias, et al.
(författare)
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Experimental Analysis of Correlations in the Nonlinear Phase Noise in Optical Fiber Systems
- 2016
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Ingår i: ECOC 2016; 42nd European Conference on Optical Communication. ; :W.1.D.4, s. 488-490
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Konferensbidrag (refereegranskat)abstract
- A dual-link self-homodyne receiver is used to measure the phase correlations introduced bythe interplay of dispersion and fiber nonlinearities. The dependence of the memory on the WDM setup,signal power and transmission distance is experimentally demonstrated.
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