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We propose a method that eliminates the 2 samples/symbol requirement on FFT-based CD estimation, and generalizes this highly-efficient, non-data-aided, frequency-domain CD estimation approach to systems with η samples/symbol where 1<;η ≤2.
We experimentally study 40 Gb/s DPSK systems over 1200 km NZ-DSF with no in-line compensation. The best performing system splits the compensation between Tx and Rx and has >3 dB margin over the FEC threshold.
Deploying spectrally-efficient 100 Gb/s coherent transponder technology in carrier networks can yield substantial CAPEX and OPEX savings. This paper discusses these economic gains and how a carrier can maximize their return on optical transport investment.
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.
A perspective on distortion compensation 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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