200 Gb/s Coherent Point-to-Multipoint Coexistence With 50G-PON for Next-Generation Optical Access

In this Letter, we demonstrate the coexistence of a prototype 200 Gb/s symmetrical coherent point-to-multipoint (PtMP) system with a 50G-PON prototype over 20 km of standard single mode fiber for next generation optical access networks. The optical path loss (OPL) of the coherent PtMP prototype exceeds 30.6 dB at 1544 nm in both directions, thus exceeding the N1 OPL class requirements. The prototype also achieves N1 OPL class requirements over the entire C-band. The experiments show full compatibility between the two systems, enabled by the wavelength plan. We also evaluate the ability of the coherent-PtMP system to support imbalanced terminations in terms of OPLs, to meet the already deployed optical access network requirements. The coherent-PtMP system flexibility is demonstrated through the reconfiguration of its subcarriers to transmit a maximum of 400 Gb/s in a single direction.