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Analysis and Experimental Demonstration of Orthant-Symmetric Four-dimensional 7 bit/4D-sym Modulation for Optical Fiber Communication

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Document pages: 17 pages

Abstract: We propose a new four-dimensional orthant-symmetric 128-ary modulation format(4D-OS128) with a spectral efficiency of 7bit 4D-sym. The proposed format fillsthe gap between polarization-multiplexed 8- and 16-ary quadrature-amplitudemodulation (PM-8QAM and PM-16QAM).Numerical simulations show that 4D-OS128outperforms two well-studied 4D geometrically-shaped modulation formats:128SP-16QAM and 7b4D-2A8PSK by up to 0.65dB for bit-interleaved codedmodulation at the same spectral efficiency. These gains are experimentallydemonstrated in a 11$ times$233Gbit s wavelength division multiplexing (WDM)transmission system operating at 5.95 bit 4D-sym over 6000km and 9000km forboth EDFA-only and hybrid amplification scenarios, respectively. A reachincrease of 15 is achieved with respect to 128-ary set-partitioning 16QAM.Furthermore, the proposed 4D-OS128 is also compared to $ boldsymbol{D} 4$lattice-based constellation and probabilistically-shaped 16QAM with finiteblocklength via simulation.

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