Contents Introduction
The optimal dispersion map for a transmission system depends on a variety of factors such as the line rate, pulse widths, and the accumulated nonlinear distortions, Recently, it has been suggested1 that transmission spans with large pre- and post-dispersion compensation (DC) may be preferable for future high bit-rate systems operating at 160 Gb/s. In addition, schemes for low cost systems may prefer lumped DC for multiple spans. Thus, dispersion-compensation modules (DCM) that yield large negative dispersion, without the attendant drawbacks of significantly higher loss or susceptibility to nonlinear distortions, may be of interest in future high bit-rate communications systems.
