Fig. 8: State-of-the-art results.
From: Overcoming laser phase noise for low-cost coherent optical communication
a The net bitrate versus the product of laser linewidth sum and symbol duration Δf × Ts. In this work, we achieve net 1.0-Tb/s PS-256-QAM single-channel transmission with a 3-MHz linewidth laser. b The information rate (IR) per 4D symbol versus the product of laser linewidth sum and symbol duration Δf × Ts. In this work, we report high-order 512-QAM transmission using transceiver lasers with both 100 kHz linewidths. 4D 4-dimensional.
