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Title: Improvement of dispersion tolerance using wavelength-interleaving and forward error correction
Authors: Xie, B
Guan, YL
Chen, J
Lu, C 
Keywords: FEC
Chromatic dispersion
Issue Date: 2006
Publisher: North-Holland
Source: Optics communications, 2006, v. 268, no. 2, p. 226-230 How to cite?
Journal: Optics communications 
Abstract: In this paper, we first derived the BER expression of an optical channel with chromatic dispersion impairment. The derived BER expression takes into account the influence of pulse spreading, transmitter rise/fall times, receiver Q-factor and noises. It is simpler and hence easier to use than many existing channel BER models. Then we proposed a wavelength-interleaved FEC scheme to mitigate the chromatic dispersion impairment in optical transmission system and analyzed its decoding performance. The minimum wavelength separation required for such a wavelength-interleaving FEC system to obtain the highest coding gain is also determined. Based on this design, the chromatic dispersion tolerance of the proposed system with 2-wavelength and 4-wavelength-interleaving are shown to improve by about 13% and 22%, respectively, over a non-interleaved system. In essence, wavelength-interleaving averages out the performances of a set of channels experiencing higher and lower dispersion, hence the interleaved channels have better performance than the non-interleaved channels experiencing higher dispersion, and worse performance than the non-interleaved channels experiencing lower dispersion. However, since WDM systems are typically designed based on the worst-case channel, the overall system performance is improved by wavelength-interleaving.
ISSN: 0030-4018
EISSN: 1873-0310
DOI: 10.1016/j.optcom.2006.07.018
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