The main impairment of differential-phase-shift-keyed communication systems is phase jitter. Noise-induced phase jitter, which is mediated by self-phase modulation, can be reduced significantly by a small number of in-line phase conjugators.
© 2003 Optical Society of America
C. J. McKinstrie, S. Radic, and C. Xie, "Reduction of soliton phase jitter by in-line phase conjugation," Opt. Lett. 28, 1519-1521 (2003)