A point-to-multipoint flexible transceiver for inherently hub-and-spoke optical access networks

Using cascaded IFFT/FFT-based multi-channel aggregation/de-aggregation and orthogonal digital filtering, P2MP flexible transceivers operating in an ‘add-as-you-grow’ mode and offering additional physical-layer security are proposed and experimentally demonstrated in upstream 55.3Gbps@25km IMDD PONs.