10 October 1997 Duobinary coding for 20-Gbit/s intensity-modulated direct-detection optical fiber transmission
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Abstract
By means of numerical simulation, we investigate the implementation of duobinary coding at 20 Gbit/s transmission over standard singlemode fiber and compare its performance with the performance of binary coding. Two system configurations are compared: duobinary coding implemented at the transmitter (DIT configuration) and duobinary coding implemented at the receiver (DIR configuration). Numerical results reveal that duobinary coding is much less impaired by fiber transmission than binary coding. However, the binary back-to-back receiver sensitivity can be as much as 9 dB better than the DIT configuration if a high-gain preamplifier is considered. The DIR configuration achieves an improvement of about 2 - 3 dB in the back-to-back receiver sensitivity because of the smaller noise bandwidth. It is shown that the DIT and DIR configurations exhibit similar dispersion penalty. Nevertheless, the DIR configuration achieves an improvement of about 2 - 3 dB in the back-to-back sensitivity because of the smaller receiver noise bandwidth.
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Joao M. B. Correia, Adolfo V. T. Cartaxo, "Duobinary coding for 20-Gbit/s intensity-modulated direct-detection optical fiber transmission", Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); doi: 10.1117/12.290399; https://doi.org/10.1117/12.290399
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