Abstract
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
<i>D</i> 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 <i>Q</i>-factor advantage over conventional DPSK.
© 2007 IEEE
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