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We investigate the effect of non-uniform span length and dispersion compensation on the performance of 100 G coherent PM-QPSK DWDM links. Optimal pre-compensation values are shown to vary greatly for the span length distributions studied.
We review recent trends and progress in the area of 100 G module and subsystem development for long haul DWDM applications and explore how the 100 G market will likely differ from that experienced at 40 G.
A perspective on impairment mitigation strategies is provided for past, present, and future commercial 40G deployments. Requirements for practical 100G deployments are ascertained from commercially successful 40G solutions, where seamless upgrade to existing 10G systems was a key requirement. Options meeting these requirements are explored.
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