High Optical Budget 25Gbit/s PON with PAM4 and Optically Amplified O Band Downstream Transmission

We experimentally demonstrate real-time downstream PAM4 transmission in O-band over 20km achieving a 35.2dB Optical Budget. Using a PDFA at the OLT and a SOA at the ONU increases the OB and eases the threshold decision of the PAM4 decoder.