Abstract
Duobinary formats are today considered as being one of the most promising
cost-effective solutions for the deployment of 40-Gb/s technology on existing
10-Gb/s WDM long-haul transmission infrastructures. Various methods for generating
duobinary formats have been developed in the past few years but to our knowledge
their respective performances for 40-Gb/s WDM transmission have never been
really compared. In this paper, we made an extensive numerical evaluation
of the robustness of these different types of duobinary transmitter to accumulation
of ASE noise, chromatic dispersion, PMD but also to single-channel and WDM
40-Gb/s transmission impairments on standard single-mode fiber. A numerical
evaluation of the ability of duobinary format for mixed 10/40-Gb/s WDM long-haul
transmission with 50-GHz channel spacing is also led, on both standard single-mode
and LEAF fibers, and compared to DQPSK format. In order to clearly identify
the limiting transmission effects on each of these two fiber types, the assessment
of the performance of a 50-GHz spaced WDM 40-Gb/s long-haul transmission using
either duobinary or DQPSK channels only is implemented at last.
© 2009 IEEE
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