The recently introduced multichip differential phase-shift keying (MC-DPSK) optical transmission format, entailing the modulation of relative phases over a moving transmission window of D successive chip intervals, is analytically and numerically analyzed. The maximum-likelihood optimal MC-DPSK receiver is derived and synthesized using integrated-optic Mach–Zehnder delay interferometers, whose electrical outputs are interpreted as generalized Stokes' parameters. The MC-DPSK performance over a nonlinear fiber channel, limited by the combination of amplified spontaneous emission noise and self-phase modulation, is further derived and simulated, demonstrating that the lowest complexity three-chip binary-phase MC-DPSK receiver provides an ~1-dB Q-factor advantage over conventional DPSK.
© 2007 IEEE
Yoav Yadin, Moshe Nazarathy, Alberto Bilenca, and Meir Orenstein, "Multichip Differential Phase-Shift-Keyed Transmission Over (Non)Linear Optical Channels," J. Lightwave Technol. 25, 1431-1440 (2007)