3-bit/symbol optical data format based on simultaneous DRZ, DPSK and PolSK orthogonal modulations

Abstract

We propose a novel 3-bit/symbol optical data format based on simultaneously modulating dark-return-to-zero (DRZ), differential-phase-shift-keying (DPSK) and polarization-shift-keying (PolSK) on the same optical carrier. Transmission performance is investigated. The proposed data format has a more compact spectrum when compared with other modulation schemes (at the same data rate), such as return-to-zero (RZ), DPSK and PolSK. It is also more tolerant to phase noise when compared with optical-differential-quadrature-phase-shift-keying (ODQPSK).

Performance investigation of optical multicast overlay system using orthogonal modulation format

“…Several orthogonal modulation formats based on superimposing the multicast data onto unicast data to be one of the most cost-effective and bandwidth efficient schemes among other conventional schemes [6][7][8][9].…”