First-and higher-order PMD tolerance of carrier-suppressed return-to-zero format with forward error correction

摘要

Polarization mode dispersion (PMD) is a severe problem in high-bit-rate long-haul transmission systems. The first and higher-order PMD tolerances of NRZ, RZ and CS-RZ formats with FEC are clarified numerically and experimentally. CS-Rz format is the most robust line-code. The combined use of CS-RZ format and FEC accepts 60 % of DGD/bit-time-interval without the PMD compensator in the presence of higher-order PMD.