An analytical theory is presented which demonstrates the timing jitter induced by amplifier noise in ultrahigh-speed dispersion- managed soliton systems when the Raman effect and thirdorder dispersion (TOD) are considered. The analysis indicates that Raman jitter remains a potential problem for picosecond and subpicosecond pulses. Positive residual TOD can enhance the timing jitter caused by the combined action of TOD and Raman effect, while vice versa for negative residual TOD. Dispersion-managed soliton, Raman effect, thirdorder dispersion, timing jitter, ultrahigh bit rates.