100-Gbit/s/λ PAM-4 signal transmission over 80-km SSMF based on an 18-GHz EML at O-band

For the first time, we experimentally demonstrate 100-Gbit/s PAM-4 signal transmission over 80km at O-band using an 18-GHz EML. After two spans of SOA-based 40-km SSMF transmission, a receiver sensitivity of −17.3dBm is achieved.