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Approaching Nyquist...
Approaching Nyquist Limit in WDM Systems by Low-Complexity Receiver-Side Duobinary Shaping
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- Li, Jianqiang, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tipsuwannakul, Ekawit, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Eriksson, Tobias, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Karlsson, Magnus, 1967 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Andrekson, Peter, 1960 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 30:11, s. 1664 - 1676
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http://dx.doi.org/10...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- A novel low-complexity coherent receiver solution is presented to improve spectral efficiency in wavelength-division multiplexing (WDM) systems. It is based on the receiver-side partial-response equalization and maximum-likelihood sequence detection (MLSD) in pre-filtered WDM systems. The partial- response equalization shapes the channel into an intermediate state with a known partial response which is finally recovered by MLSD without the need of channel estimation. In this scheme, the severe ISI induced by the pre-filtering can be shared between the partial-response equalization and MLSD. Therefore, a tradeoff can be made between complexity and performance. The feasibility of receiver-side partial-response shaping relaxes the efforts and requirements on the transmitter-side pre-filtering, which permits the mature WDM components to implement pre-filtering. In addition, the partial-response equalization or shaping structure is also improved based on our prior art, which further simplifies the overall scheme. For near-baudrate-spacing optically-pre-filtered WDM systems, duobinary response is experimentally proved as a good intermediate response to shape. Due to the short memory of the duobinary response, the complexity of the receiver based on duobinary shaping has been reduced to a low level. As a whole, the proposed scheme provides a good alternative to Nyquist-WDM at comparable spectral efficiencies. With the proposed receiver-side duobinary shaping technique, three sets of experiments have been carried out to verify the improved duobinary shaping scheme and meanwhile demonstrate the main features, including 5*112-Gbit/s polarization-multiplexed quadrature phase-shift keying (PM-QPSK) WDM transmission over a 25-GHz grid, single- channel 40-Gbaud PM-QPSK experiment, and 30-GHz-spaced 3*224-Gbit/s PM 16-ary quadrature amplitude modulation transmission.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
Keyword
- high spectral-efficiency
- optical fiber communications
- wavelength division multiplexing
- Coherent detection
- digital signal processing
Publication and Content Type
- art (subject category)
- ref (subject category)
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