The effect of carrier phase noise on arrival time jitter, bit error rate (BER) and dispersion tolerance is analyzed. The performance of a soliton system with optical source noise in the presence of fixed filters, synchronous modulators, optical phase conjugation, and dispersion management is also evaluated. The existence of carrier phase noise increases time jitter and BER, reduces dispersion tolerance, and changes the optimum position of optical phase conjugator. With one of the above transmission controls and proper parameter selection, one can still find a dispersion tolerance where BER is less than 10 - 9 in a high-speed long-distance soliton system even with carrier linewidth.