Nonlinearity and In-Line Residual Dispersion Tolerance of pi-AP-RZ and CS-RZ Modulation Formats in 40-Gb/s Transmission Over Standard Single-Mode Fiber

摘要

We achieved a 40percent increase in 40-Gb/s transmission distance in links with exact dispersion compensation through suppression of nonlinear distortion by using the alternate-phase return-to-zero (AP-RZ) modulation format. A novel experimental technique was used to compare in-line residual dispersion tolerances, and it was found that AP-RZ is less dispersion tolerant than conventional RZ and carrier-suppressed RZ (CS-RZ) when both linear and nonlinear transmission are considered. Maximum dispersion tolerance of +-50 psm over 300 km was shown to be possible using CS-RZ.