Flexible Data-rate and Reach Transmission Employing Hybrid Modulation and Scrambled Coherent Superposition

Subcarrier multiplexing hybrid QAM combined with coherent superposition is proposed to achieve flexibility in spectral efficiency (SE) and reach. Experimental evaluation over SSMF shows scalable SE from 4.9 to 1.2 bit/s/Hz with maximum reach from 2000 to 15500 km, respectively.