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Second-order PMD has been successfully mitigated for 80-Gbit/s RZ-DQPSK signals by an all-optical regenerator based on optical parametric amplification. System performance comparison has been made for a conventional polarizer-based PMD compensator.
The change of a field spectrum of signal light in long-haul coherent optical fibre communication systems using in-line amplifiers is measured in the normal and anomalous dispersion regions of a fibre. Results show that the interplay of nonlinear Kerr effect and fibre chromatic dispersion cause a fatal change in the field spectrum in the anomalous dispersion region.<<ETX>>
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