METHOD AND APPARATUS FOR THE GENERATION AND DETECTION OF OPTICAL DIFFERENTIAL VARIED-MULTILEVEL PHASE-SHIFT KEYING WITH PULSE AMPLITUDE MODULATION (ODVMPSK/PAM) SIGNALS

摘要

Methods and apparatus are described for generating and receiving amplitude and differential-phase encoded signals in which the number of phase states at a given amplitude level is always less than or equal to that at a higher amplitude level and at least two amplitude levels have different numbers of phase states.