Comparison of Systems Tolerance to Polarization Mode Dispersion Between Different Modulation Formats
01 January 2003
The polarization mode dispersion (PMD) tolerance of different modulation formats is studied, including on-off-keyed, differential-phase-shift-keyed (DPSK), and carrier-suppressed return-to-zero (CSRZ) formats. It is shown that, generally, for uncompensated systems the modulation formats with larger pulse width have larger penalty, while the modulation formats with smaller bandwidth perform better in PMD compensated systems. It is also shown that the DPSK can tolerate more PMD than the OOK for both PMD uncompensated and compensated systems, and the CSRZ, because of its specific spectrum and phase characteristics, has a different feature from return-to-zero (RZ) formats.