1λ,6 bits/symbol, 280 and 350 Gb/s direct detection transceiver using intensity modulation, polarization multiplexing, and inter-polarization phase modulation

We demonstrate 1λ, 6 bits/symbol, 280 and 350 Gb/s throughput with direct detection of polarization multiplexed PAM-4 intensity modulation and inter-polarization phase modulation over 4 phases at BERs of 2.5×10
^-3
(<;HD-FEC) and 1.6×10
^-2
(<;SD-FEC), respectively.