Time interleaved DPSK/ASK transmitter with directly beat modulated DFB for coherent WDM-PON

We experimentally demonstrate a novel low-cost 2.5 Gb/s/? transmitter based on a directly modulated DFB laser featuring DPSK/ASK interleaved in time. Rx sensitivity of -44 dBm is achieved at BER=4· 10-3 with 2 dB improvement compared to 2.5 Gb/s/? ASK transmitter. © 2018 IEEE.