Self phase modulation limitations in long nonrepeatered standard fibre transmission: influence from dispersion compensation scheme and modulation format

Obtaining high power budgets by combating self phase modulation (SPM) induced distortion by system design is of great importance in long nonrepeatered standard fibre transmission systems. Among the important design considerations is the choice of dispersion compensation scheme and modulation format. The optimum modulation format may be return-to-zero (RZ) or nonreturn-to-zero (NRZ), binary or duobinary. Dispersion compensating schemes includes, precompensation, postcompensation, a combination thereof, as well as the degree of compensation: overcompensation, 100% compensation, and undercompensation. Most numerical studies on this topic has limited the analysis to either fixing the bitrate, modulation format, or the dispersion compensation scheme. In this paper we demonstrates numerically how the systems ability to combat SPM depends on all these three parameters. Hence optimum design rules are found, allowing to maximise transmission length, and system margin.