Method and system for reducing transmission penalties associated with ghost pulses

Abstract

A method and apparatus for reducing transmission penalties associated with ghost pulses in an optical signal in a transmission system includes providing phase modulation to the optical signal in the transmission system with a period of phase modulation greater than a bit period of the transmission system, wherein the phase modulation is applied to the optical signal such that the phases of at least some logical “ones” within a sequence of logical “ones” of the optical signal are modified such that the phases of the individual ghost-pulse fields from each triplet of “ones” are different, either pseudo-randomized or substantially shifted by π, thereby resulting in a reduction of the total ghost pulse. Advantageously, there is no need to synchronize the timing of the phase modulation with the timing of the power profile of the optical signal.

Dependencies are inferred from the claim text.